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If many measurements are made on such objects when they’re prepared in an identical manner, the wave function always correctly predicts the statistical distribution of outcomes. But there’s no way of knowing what the outcome of any single measurement will be — quantum mechanics offers only probabilities. What determines a specific observation? In 1932, the mathematical physicist John von Neumann proposed that, when a measurement is made, the wave function is “collapsed” into one of the possible outcomes. The process is essentially random but biased by the probabilities it encodes. Quantum mechanics itself doesn’t appear to predict the collapse, which has to be manually added to the calculations.
As an ad hoc mathematical trick, it works well enough. But it seemed (and continues to seem) to some researchers to be an unsatisfactory sleight of hand. Einstein famously likened it to God playing dice to decide what becomes “real” — what we actually observe in our classical world. The Danish physicist Niels Bohr, in his so-called Copenhagen interpretation, simply pronounced the issue out of bounds, saying that physicists just had to accept a fundamental distinction between the quantum and classical regimes. In contrast, in 1957 the physicist Hugh Everett asserted that wave function collapse is just an illusion and that in fact all outcomes are realized in a near-infinite number of branching universes — what physicists now call “many worlds.”
The truth is that “the fundamental cause of the wave function collapse is yet unknown,” said Inwook Kim, a physicist at the Lawrence Livermore National Laboratory in California. “Why and how does it occur?”
In 1986, the Italian physicists Giancarlo Ghirardi, Alberto Rimini and Tullio Weber suggested an answer. What if, they said, Schrödinger’s wave equation was not the whole story? They posited that a quantum system is constantly prodded by some unknown influence that can induce it to spontaneously jump into one of the system’s possible observable states, on a timescale that depends on how big the system is. A small, isolated system, such as an atom in a quantum superposition (a state in which several measurement outcomes are possible), will stay that way for a very long time. But bigger objects — a cat, say, or an atom when it interacts with a macroscopic measuring device — collapse into a well-defined classical state almost instantaneously. This so-called GRW model (after the trio’s initials) was the first physical-collapse model; a later refinement known as the continuous spontaneous localization (CSL) model involved gradual, continuous collapse rather than a sudden jump. These models are not so much interpretations of quantum mechanics as additions to it, said the physicist Magdalena Zych of the University of Queensland in Australia.
What is it that causes this spontaneous localization via wave function collapse? The GRW and CSL models don’t say; they just suggest adding a mathematical term to the Schrödinger equation to describe it. But in the 1980s and ’90s, the mathematical physicists Roger Penrose of the University of Oxford and Lajos Diósi of Eötvös Loránd University in Budapest independently proposed a possible cause of the collapse: gravity. Loosely speaking, their idea was that if a quantum object is in a superposition of locations, each position state will “feel” the others via their gravitational interaction. It is as if this attraction causes the object to measure itself, forcing a collapse. Or if you look at it from the perspective of general relativity, which describes gravity, a superposition of localities deforms the fabric of space-time in two different ways at once, a circumstance that general relativity can’t accommodate. As Penrose has put it, in a standoff between quantum mechanics and general relativity, quantum will crack first.
The Test of Truth
These ideas have always been highly speculative. But, in contrast to explanations of quantum mechanics like the Copenhagen and Everett interpretations, physical-collapse models have the virtue of making observable predictions — and thus being testable and falsifiable.
If there is indeed a background perturbation that provokes quantum collapse — whether it comes from gravitational effects or something else — then all particles will be continuously interacting with this perturbation, whether they are in a superposition or not. The consequences should in principle be detectable. The interaction should create a “permanent zigzagging of particles in space” comparable to Brownian motion, said Catalina Curceanu, a physicist at INFN.
Current physical-collapse models suggest that this diffusive motion is only very slight. Nonetheless, if the particle is electrically charged, the motion will generate electromagnetic radiation in a process called bremsstrahlung. A lump of matter should thus continuously emit a very faint stream of photons, which typical versions of the models predict to be in the X-ray range. Donadi and his colleague Angelo Bassi have shown that emission of such radiation is expected from any model of dynamical spontaneous collapse, including the Diósi-Penrose model.
Yet “while the idea is simple, in practice the test is not so easy,” said Kim. The predicted signal is extremely weak, which means that an experiment must involve an enormous number of charged particles to get a detectable signal. And the background noise — which comes from sources such as cosmic rays and radiation in the environment — must be kept low. Those conditions can only be satisfied by the most extremely sensitive experiments, such as those designed to detect dark matter signals or the elusive particles called neutrinos.
In 1996, Qijia Fu of Hamilton College in New York — then just an undergraduate — proposed using germanium-based neutrino experiments to detect a CSL signature of X-ray emission. (Weeks after he submitted his paper, he was struck by lightning on a hiking trip in Utah and killed.) The idea was that the protons and electrons in germanium should emit the spontaneous radiation, which ultrasensitive detectors would pick up. Yet only recently have instruments with the required sensitivity come online.
In 2020, a team in Italy, including Donadi, Bassi and Curceanu, along with Diósi in Hungary, used a germanium detector of this sort to test the Diósi-Penrose model. The detectors, created for a neutrino experiment called IGEX, are shielded from radiation by virtue of their location underneath Gran Sasso, a mountain in the Apennine range of Italy.
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Experiments Spell Doom for Quantum “Collapse” Theory | Quanta Magazine”,”max_num_pages”:0,”found_posts”:0,”extra_term”:””,”author”:{“type”:”id”,”generated”:false,”id”:”Author:null”,”typename”:”Author”},”tag”:{“type”:”id”,”generated”:false,”id”:”Term:null”,”typename”:”Term”},”category”:{“type”:”id”,”generated”:false,”id”:”Term:null”,”typename”:”Term”},”__typename”:”PageData”},”Author:null”:{“id”:null,”name”:null,”link”:null,”description”:null,”url”:null,”public_email”:null,”facebook”:null,”twitter”:null,”instagram”:null,”acf”:null,”__typename”:”Author”},”Term:null”:{“id”:null,”slug”:null,”name”:null,”link”:null,”description”:null,”image”:””,”__typename”:”Term”},”Post:119930″:{“id”:”119930″,”title”:”Experiments Spell Doom for Decades-Old Explanation of Quantum Weirdness”,”excerpt”:”\u003cp>Physical-collapse theories have long offered a natural solution to the central mystery of the quantum world. But a series of increasingly precise experiments are making them untenable. \u003c/p>\n”,”link”:” https://www.quantamagazine.org/?p=119930″,”date”:”2022-10-20T10:20:53″,”featured_media_image”:null,”authors”:[{“type”:”id”,”generated”:true,”id”:”Post:119930.authors.0″,”typename”:”Author”}],”tags”:[{“type”:”id”,”generated”:true,”id”:”Post:119930.tags.0″,”typename”:”Term”},{“type”:”id”,”generated”:true,”id”:”Post:119930.tags.1″,”typename”:”Term”},{“type”:”id”,”generated”:true,”id”:”Post:119930.tags.2″,”typename”:”Term”},{“type”:”id”,”generated”:true,”id”:”Post:119930.tags.3″,”typename”:”Term”},{“type”:”id”,”generated”:true,”id”:”Post:119930.tags.4″,”typename”:”Term”}],”podcast”:null,”acf”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf”,”typename”:”ACFFields”},”__typename”:”Post”,”status”:”publish”,”content”:””,”categories”:[{“type”:”id”,”generated”:false,”id”:”Term:189″,”typename”:”Term”}],”attachments”:null,”series_prev”:null,”series_next”:null,”next”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.next”,”typename”:”PostPageArchive”}},”Post:119930.authors.0″:{“name”:”Philip Ball”,”link”:” physics”,”link”:” worlds”,”link”:” interpretations”,”link”:” physics”,”link”:”https://www.quantamagazine.org/tag/quantum-physics/”},”$Post:119930.acf”:{“featured_block_title”:””,”kicker”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.kicker”,”typename”:”Term”},”featured_image_default”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.featured_image_default”,”typename”:”Image”},”featured_image_square”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.featured_image_square”,”typename”:”Image”},”featured_image_full_width”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.featured_image_full_width”,”typename”:”Image”},”featured_image_gif”:false,”featured_video”:”false”,”full_page_interactive”:false,”podcast_publish_date”:””,”__typename”:”ACFFields”,”interactive_type”:null,”iframe_url”:null,”return_cursor”:null,”exclude_blurb”:null,”interactive_html”:null,”interactive_css”:null,”interactive_js”:null,”interactive_blurb”:null,”related_article”:null,”modules”:[{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.0″,”typename”:”ACFImageComponent”},{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.1″,”typename”:”ACFContent”},{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.2″,”typename”:”ACFImageComponent”},{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.3″,”typename”:”ACFContent”},{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.4″,”typename”:”ACFImageComponent”},{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.5″,”typename”:”ACFContent”},{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.6″,”typename”:”ACFImageComponent”},{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.7″,”typename”:”ACFContent”}],”template”:”article”,”subtitle”:”Physical-collapse theories have long offered a natural solution to the central mystery of the quantum world. But a series of increasingly precise experiments are making them untenable. “,”title_layout”:”default”,”title_background_type”:null,”title_background_image”:null,”title_background_video”:null,”title_background_attribution”:null,”title_background_image_gif”:null,”title_overlay_enable”:null,”title_overlay_color”:null,”title_overlay_opacity”:null,”title_text_color”:null,”featured_image_attribution”:”\u003cp data-pm-slice=\”1 1 []\”>Michal Bednarski for Quanta Magazine\u003c/p>\n”,”featured_overlay_enable”:”false”,”featured_overlay_color”:null,”featured_overlay_opacity”:null,”series”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.series”,”typename”:”Term”},”intro_content”:null,”make_image_full_width”:null,”hide_ad_on_post”:false},”$Post:119930.acf.kicker”:{“name”:”quantum physics”,”link”:” graph that’s broken and crumbling”,”caption”:””,”url”:” graph that’s broken and crumbling”,”caption”:””,”url”:” graph that’s broken and crumbling”,”caption”:””,”url”:” Writer”,”avatar”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.authors.0.acf.avatar”,”typename”:”Image”},”__typename”:”AuthorACF”},”$Post:119930.authors.0.acf.avatar”:{“alt”:””,”caption”:””,”url”:” data-pm-slice=\”1 1 []\”>Michal Bednarski for Quanta Magazine\u003c/p>\n”,”caption”:”\u003cp>Theories that propose a natural trigger for the collapse of the quantum wave function appear to themselves be collapsing.\u003c/p>\n”,”mobile_comp_caption”:””,”mobile_comp_attribution”:””,”sets”:[{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.0.sets.0″,”typename”:”ImageSet”}],”__typename”:”ACFImageComponent”},”$Post:119930.acf.modules.0.sets.0″:{“settings”:””,”image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.0.sets.0.image”,”typename”:”Image”},”mobile_image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.0.sets.0.mobile_image”,”typename”:”Image”},”mobile_side_margins”:false,”mobile_width_constraint”:””,”mobile_caption”:””,”mobile_attribution”:””,”zoom_image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.0.sets.0.zoom_image”,”typename”:”Image”},”zoom_caption”:””,”zoom_attribution”:””,”mobile_zoom_image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.0.sets.0.mobile_zoom_image”,”typename”:”Image”},”mobile_zoom_caption”:””,”mobile_zoom_attribution”:””,”external_link”:””,”__typename”:”ImageSet”},”$Post:119930.acf.modules.0.sets.0.image”:{“alt”:”A graph that’s broken and crumbling”,”caption”:””,”url”:” does objective reality emerge from the palette of possibilities supplied by quantum mechanics? That question — the deepest and most vexed issue posed by the theory — is still the subject of arguments a century old. Possible explanations for how observations of the world yield definite, “classical” results, drawing on different interpretations of what quantum mechanics means, have only multiplied over those hundred or so years.\u003c/p>\n\u003cp>But now we may be ready to eliminate at least one set of proposals. Recent experiments have mobilized the extreme sensitivity of particle physics instruments to test the idea that the “collapse” of quantum possibilities into a single classical reality is not just a mathematical convenience but a real physical process — an idea called “physical collapse.” The experiments find no evidence of the effects predicted by at least the simplest varieties of these collapse models.\u003c/p>\n\u003cp>It’s still too early to say definitively that physical collapse does not occur. Some researchers believe that the models could yet be modified to escape the constraints placed on them by the experiments’ null results. But while “it is always possible to rescue any model,” said \u003ca href=\” Donadi\u003c/a>, a theoretical physicist at the National Institute for Nuclear Physics (INFN) in Trieste, Italy, who led one of the experiments, he doubts that “the community will keep modifying the models [indefinitely], since there will not be too much to learn by doing that.” The noose seems to be tightening on this attempt to resolve the biggest mystery of quantum theory.\u003c/p>\n\u003ch2>\u003cstrong>What Causes Collapse?\u003c/strong>\u003c/h2>\n\u003cp>Physical collapse models aim to resolve a central dilemma of conventional quantum theory. In 1926 Erwin Schrödinger \u003ca href=\” that a quantum object is described by a mathematical entity called a wave function, which encapsulates all that can be said about the object and its properties. As the name implies, a wave function describes a kind of wave — but not a physical one. Rather, it is a “probability wave,” which allows us to predict the various possible outcomes of measurements made on the object, and the chance of observing any one of them in a given experiment.\u003c/p>\n”,”fadein”:false,”__typename”:”ACFContent”},”$Post:119930.acf.modules.2″:{“hide_this_component”:null,”acf_fc_layout”:”image_component”,”layout”:”regular”,”settings”:””,”attribution”:”\u003cp data-pm-slice=\”1 1 ["list",{},"list_item",{"indent":1,"type":"bulleted"}]\”>Nick Hubbard, Sanford Underground Research Facility\u003c/p>\n”,”caption”:”\u003cp>Detectors such as this one, originally designed for neutrino research, have taken on a second job testing the predictions of physical-collapse theories.\u003c/p>\n”,”mobile_comp_caption”:””,”mobile_comp_attribution”:””,”sets”:[{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.2.sets.0″,”typename”:”ImageSet”}],”__typename”:”ACFImageComponent”},”$Post:119930.acf.modules.2.sets.0″:{“settings”:””,”image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.2.sets.0.image”,”typename”:”Image”},”mobile_image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.2.sets.0.mobile_image”,”typename”:”Image”},”mobile_side_margins”:false,”mobile_width_constraint”:””,”mobile_caption”:””,”mobile_attribution”:””,”zoom_image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.2.sets.0.zoom_image”,”typename”:”Image”},”zoom_caption”:””,”zoom_attribution”:””,”mobile_zoom_image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.2.sets.0.mobile_zoom_image”,”typename”:”Image”},”mobile_zoom_caption”:””,”mobile_zoom_attribution”:””,”external_link”:””,”__typename”:”ImageSet”},”$Post:119930.acf.modules.2.sets.0.image”:{“alt”:””,”caption”:””,”url”:” many measurements are made on such objects when they’re prepared in an identical manner, the wave function always correctly predicts the statistical distribution of outcomes. But there’s no way of knowing what the outcome of any single measurement will be — quantum mechanics offers only probabilities. What determines a specific observation? In 1932, the mathematical physicist John von Neumann proposed that, when a measurement is made, the wave function is “collapsed” into one of the possible outcomes. The process is essentially random but biased by the probabilities it encodes. Quantum mechanics itself doesn’t appear to predict the collapse, which has to be manually added to the calculations.\u003c/p>\n\u003cp>As an ad hoc mathematical trick, it works well enough. But it seemed (and continues to seem) to some researchers to be an unsatisfactory sleight of hand. Einstein famously likened it to God playing dice to decide what becomes “real” — what we actually observe in our classical world. The Danish physicist Niels Bohr, in his so-called Copenhagen interpretation, simply pronounced the issue out of bounds, saying that physicists just had to accept a fundamental distinction between the quantum and classical regimes. In contrast, in 1957 the physicist Hugh Everett asserted that wave function collapse is just an illusion and that in fact all outcomes are realized in a near-infinite number of branching universes — what physicists now call “\u003ca href=\” worlds\u003c/a>.”\u003c/p>\n\u003cp>The truth is that “the fundamental cause of the wave function collapse is yet unknown,” said \u003ca href=\” Kim\u003c/a>, a physicist at the Lawrence Livermore National Laboratory in California. “Why and how does it occur?”\u003c/p>\n\u003cdiv id=’component-6351596c45d0e’ class=””>\u003cscript type=\”text/template\”>{\”type\”:\”Image\”,\”id\”:\”component-6351596c45d0e\”,\”data\”:{\”id\”:119949,\”src\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/10\\/EDITED_Bassi_QM_2.jpg\”,\”alt\”:\”\”,\”class\”:\”\”,\”width\”:1120,\”height\”:1680,\”mobileSrc\”:false,\”zoomSrc\”:false,\”mobileZoomSrc\”:false,\”align\”:\”align=\\\”right\\\”\”,\”wrapper_width\”:\”\”,\”caption\”:\”\u003cp>Angelo Bassi has worked on both theoretical collapse models and the experimental tests of them.\u003c\\/p>\\n\”,\”attribution\”:\”\u003cp>Universit\\u00e0 degli Studi di Trieste\u003c\\/p>\\n\”,\”variant\”:\”shortcode\”,\”size\”:\”default\”,\”disableZoom\”:false,\”disableMobileZoom\”:false,\”srcImage\”:{\”ID\”:119949,\”id\”:119949,\”title\”:\”EDITED_Bassi_QM_2\”,\”filename\”:\”EDITED_Bassi_QM_2.jpg\”,\”filesize\”:334963,\”url\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/10\\/EDITED_Bassi_QM_2.jpg\”,\”link\”:\”https:\\/\\/www.quantamagazine.org\\/physics-experiments-spell-doom-for-quantum-collapse-theory-20221020\\/edited_bassi_qm_2\\/\”,\”alt\”:\”\”,\”author\”:\”42689\”,\”description\”:\”\”,\”caption\”:\”\”,\”name\”:\”edited_bassi_qm_2\”,\”status\”:\”inherit\”,\”uploaded_to\”:119930,\”date\”:\”2022-10-19 19:35:57\”,\”modified\”:\”2022-10-19 19:35:57\”,\”menu_order\”:0,\”mime_type\”:\”image\\/jpeg\”,\”type\”:\”image\”,\”subtype\”:\”jpeg\”,\”icon\”:\”https:\\/\\/api.quantamagazine.org\\/wp-includes\\/images\\/media\\/default.png\”,\”width\”:1120,\”height\”:1680,\”sizes\”:{\”thumbnail\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/10\\/EDITED_Bassi_QM_2-347×520.jpg\”,\”thumbnail-width\”:347,\”thumbnail-height\”:520,\”medium\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/10\\/EDITED_Bassi_QM_2.jpg\”,\”medium-width\”:1120,\”medium-height\”:1680,\”medium_large\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/10\\/EDITED_Bassi_QM_2-768×1152.jpg\”,\”medium_large-width\”:768,\”medium_large-height\”:1152,\”large\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/10\\/EDITED_Bassi_QM_2.jpg\”,\”large-width\”:1120,\”large-height\”:1680,\”1536×1536\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/10\\/EDITED_Bassi_QM_2-1024×1536.jpg\”,\”1536×1536-width\”:1024,\”1536×1536-height\”:1536,\”2048×2048\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/10\\/EDITED_Bassi_QM_2.jpg\”,\”2048×2048-width\”:1120,\”2048×2048-height\”:1680,\”square_small\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/10\\/EDITED_Bassi_QM_2-160×160.jpg\”,\”square_small-width\”:160,\”square_small-height\”:160,\”square_large\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/10\\/EDITED_Bassi_QM_2-520×520.jpg\”,\”square_large-width\”:520,\”square_large-height\”:520}},\”largeForPrint\”:true,\”externalLink\”:\”\”,\”original_resolution\”:false}}\u003c\/script>\u003c/div>\n\u003cp>In 1986, the Italian physicists Giancarlo Ghirardi, Alberto Rimini and Tullio Weber \u003ca href=\” an answer. What if, they said, Schrödinger’s wave equation was not the whole story? They posited that a quantum system is constantly prodded by some unknown influence that can induce it to spontaneously jump into one of the system’s possible observable states, on a timescale that depends on how big the system is. A small, isolated system, such as an atom in a quantum superposition (a state in which several measurement outcomes are possible), will stay that way for a very long time. But bigger objects — a cat, say, or an atom when it interacts with a macroscopic measuring device — collapse into a well-defined classical state almost instantaneously. This so-called GRW model (after the trio’s initials) was the first physical-collapse model; a later \u003ca href=\” known as the continuous spontaneous localization (CSL) model involved gradual, continuous collapse rather than a sudden jump. These models are not so much interpretations of quantum mechanics as additions to it, said the physicist \u003ca href=\” Zych\u003c/a> of the University of Queensland in Australia.\u003c/p>\n\u003cp>What is it that causes this spontaneous localization via wave function collapse? The GRW and CSL models don’t say; they just suggest adding a mathematical term to the Schrödinger equation to describe it. But in the 1980s and ’90s, the mathematical physicists Roger Penrose of the University of Oxford and Lajos Diósi of Eötvös Loránd University in Budapest independently proposed a possible cause of the collapse: gravity. Loosely speaking, their idea was that if a quantum object is in a superposition of locations, each position state will “feel” the others via their gravitational interaction. It is as if this attraction causes the object to measure itself, forcing a collapse. Or if you look at it from the perspective of general relativity, which describes gravity, a superposition of localities deforms the fabric of space-time in two different ways at once, a circumstance that general relativity can’t accommodate. As Penrose has put it, in a standoff between quantum mechanics and general relativity, quantum will crack first.\u003c/p>\n\u003ch2>\u003cstrong>The Test of Truth\u003c/strong>\u003c/h2>\n\u003cp>These ideas have always been highly speculative. But, in contrast to explanations of quantum mechanics like the Copenhagen and Everett interpretations, physical-collapse models have the virtue of making observable predictions — and thus being testable and falsifiable.\u003c/p>\n\u003cdiv id=’component-6351596c45f54′ class=””>\u003cscript type=\”text/template\”>{\”type\”:\”Text\”,\”id\”:\”component-6351596c45f54\”,\”data\”:{\”content\”:\”\u003ch2>\u003cstrong>Quantum Consciousness?\u003c\\/strong>\u003c\\/h2>\\n\u003cp>One of the most provocative and speculative predictions of the Di\\u00f3si-Penrose physical-collapse model is that it might explain consciousness. Specifically, gravity might induce the collapse of quantum mechanical vibrations in protein filaments called microtubules in neurons, thereby triggering conscious awareness. These ideas, which Roger Penrose developed in collaboration with the anesthesiologist Stuart Hameroff, produced the \\u201c\u003ca href=\\\”https:\\/\\/www.sciencedirect.com\\/science\\/article\\/pii\\/S1571064513001188\\\”>Orch OR\u003c\\/a>\\u201d model of consciousness.\u003c\\/p>\\n\u003cp>\\u201cConsciousness does really seem to be a mystery from the point of view of conventional physics,\\u201d said Curceanu. Associating it with quantum collapse, she said, is an \\u201cattractive idea.\\u201d\u003c\\/p>\\n\u003cp>If physical-collapse models are excluded by experiments, as they seem to be, then the game is up \\u2014 the models cannot possibly explain consciousness. Regardless, other experiments seem to be putting an end to Orch OR anyway. The oncologist and physicist \u003ca href=\\\”https:\\/\\/apps.ualberta.ca\\/directory\\/person\\/jackt\\\”>Jack Tuszynski\u003c\\/a> of the University of Alberta is heading a project with Hameroff in which several teams have independently conducted biophysical experiments on aspects of the model, including spectroscopic studies of the collective quantum states of microtubules. Their report is still in peer review, but the results showed no sign of the effects predicted. \\u201cNothing is conclusively ruled out yet, if it ever can be,\\u201d said Tuszynski, \\u201cbut the improbability of each Orch OR assumption becomes compounded when taken in combination, which makes it exceedingly hard to accept such an infinitesimally small possibility.\\u201d\u003c\\/p>\\n\”,\”alignment\”:\”right\”,\”divider\”:true}}\u003c\/script>\u003c/div>\n\u003cp>If there is indeed a background perturbation that provokes quantum collapse — whether it comes from gravitational effects or something else — then all particles will be continuously interacting with this perturbation, whether they are in a superposition or not. The consequences should in principle be detectable. The interaction should create a “permanent zigzagging of particles in space” comparable to Brownian motion, said Catalina Curceanu, a physicist at INFN.\u003c/p>\n\u003cp>Current physical-collapse models suggest that this diffusive motion is only very slight. Nonetheless, if the particle is electrically charged, the motion will generate electromagnetic radiation in a process called bremsstrahlung. A lump of matter should thus continuously emit a very faint stream of photons, which typical versions of the models predict to be in the X-ray range. Donadi and his colleague \u003ca href=\” Bassi\u003c/a> have \u003ca href=\” that emission of such radiation is expected from any model of dynamical spontaneous collapse, including the Diósi-Penrose model.\u003c/p>\n\u003cp>Yet “while the idea is simple, in practice the test is not so easy,” said Kim. The predicted signal is extremely weak, which means that an experiment must involve an enormous number of charged particles to get a detectable signal. And the background noise — which comes from sources such as cosmic rays and radiation in the environment — must be kept low. Those conditions can only be satisfied by the most extremely sensitive experiments, such as those designed to detect dark matter signals or the elusive particles called neutrinos.\u003c/p>\n\u003cp>In 1996, Qijia Fu of Hamilton College in New York — then just an undergraduate — \u003ca href=\” using germanium-based neutrino experiments to detect a CSL signature of X-ray emission. (Weeks after he submitted his paper, he was \u003ca href=\” by lightning\u003c/a> on a hiking trip in Utah and killed.) The idea was that the protons and electrons in germanium should emit the spontaneous radiation, which ultrasensitive detectors would pick up. Yet only recently have instruments with the required sensitivity come online.\u003c/p>\n\u003cp>In 2020, a team in Italy, including Donadi, Bassi and Curceanu, along with Diósi in Hungary, used a germanium detector of this sort to test the Diósi-Penrose model. The detectors, created for a neutrino experiment called IGEX, are shielded from radiation by virtue of their location underneath Gran Sasso, a mountain in the Apennine range of Italy.\u003c/p>\n”,”fadein”:false,”__typename”:”ACFContent”},”$Post:119930.acf.modules.4″:{“hide_this_component”:null,”acf_fc_layout”:”image_component”,”layout”:”inline”,”settings”:””,”attribution”:”\u003cp data-pm-slice=\”1 1 ["list",{},"list_item",{"indent":1,"type":"bulleted"}]\”>TEDxRoma\u003c/p>\n”,”caption”:”\u003cp>Catalina Curceanu, seen here at a TedX event in Rome in 2016, used particle-physics detectors to put stringent limits on collapse theories.\u003c/p>\n”,”mobile_comp_caption”:””,”mobile_comp_attribution”:””,”sets”:[{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.4.sets.0″,”typename”:”ImageSet”}],”__typename”:”ACFImageComponent”},”$Post:119930.acf.modules.4.sets.0″:{“settings”:””,”image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.4.sets.0.image”,”typename”:”Image”},”mobile_image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.4.sets.0.mobile_image”,”typename”:”Image”},”mobile_side_margins”:false,”mobile_width_constraint”:””,”mobile_caption”:””,”mobile_attribution”:””,”zoom_image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.4.sets.0.zoom_image”,”typename”:”Image”},”zoom_caption”:””,”zoom_attribution”:””,”mobile_zoom_image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.4.sets.0.mobile_zoom_image”,”typename”:”Image”},”mobile_zoom_caption”:””,”mobile_zoom_attribution”:””,”external_link”:””,”__typename”:”ImageSet”},”$Post:119930.acf.modules.4.sets.0.image”:{“alt”:””,”caption”:””,”url”:” carefully subtracting the remaining background signal — mostly natural radioactivity from the rock — the physicists \u003ca href=\” no emission\u003c/a> at a sensitivity level that ruled out the simplest form of the Diósi-Penrose model. They also \u003ca href=\” strong bounds\u003c/a> on the parameters within which various CSL models might still work. The original GRW model lies just within this tight window: It survived by a whisker.\u003c/p>\n\u003cp>In a \u003ca href=\” published this August\u003c/a>, the 2020 result was confirmed and strengthened by an experiment called the Majorana Demonstrator, which was established primarily to search for hypothetical particles called Majorana neutrinos (which have the curious property of being their own antiparticles). The experiment is housed in the Sanford Underground Research Facility, which lies almost 5,000 feet underground in a former gold mine in South Dakota. It has a larger array of high-purity germanium detectors than IGEX, and they can detect X-rays down to low energies. “Our limit is much more stringent compared to the previous work,” said Kim, a member of the team.\u003c/p>\n\u003ch2>\u003cstrong>A Messy End\u003c/strong>\u003c/h2>\n\u003cp>Although physical-collapse models are badly ailing, they’re not quite dead. “The various models make very different assumptions about the nature and the properties of the collapse,” said Kim. Experimental tests have now excluded most plausible possibilities for these values, but there’s still a small island of hope.\u003c/p>\n\u003cdiv id=’component-6351596c49f38′ class=””>\u003cscript type=\”text/template\”>{\”type\”:\”Text\”,\”id\”:\”component-6351596c49f38\”,\”data\”:{}}\u003c\/script>\u003c/div>\n\u003cp>Continuous spontaneous localization models propose that the physical entity perturbing the wave function is some sort of “noise field,” which the current tests assume is white noise: uniform at all frequencies. That’s the simplest assumption. But it’s possible that the noise might be “colored,” for example by having some high-frequency cutoff. Curceanu said that testing these more complicated models will require measuring the emission spectrum at higher energies than has been possible so far.\u003c/p>\n”,”fadein”:false,”__typename”:”ACFContent”},”$Post:119930.acf.modules.6″:{“hide_this_component”:null,”acf_fc_layout”:”image_component”,”layout”:”large”,”settings”:””,”attribution”:”\u003cp data-pm-slice=\”1 1 ["list",{},"list_item",{"indent":1,"type":"bulleted"}]\”>Kai Freund/LNGS-INFN.\u003c/p>\n”,”caption”:”\u003cp>The Gerda experiment features a large tank that will hold the geranium detectors inside a protective layer of liquid argon. The hall surrounding the tank will be filled with purified water.\u003c/p>\n”,”mobile_comp_caption”:””,”mobile_comp_attribution”:””,”sets”:[{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.6.sets.0″,”typename”:”ImageSet”}],”__typename”:”ACFImageComponent”},”$Post:119930.acf.modules.6.sets.0″:{“settings”:””,”image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.6.sets.0.image”,”typename”:”Image”},”mobile_image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.6.sets.0.mobile_image”,”typename”:”Image”},”mobile_side_margins”:false,”mobile_width_constraint”:””,”mobile_caption”:””,”mobile_attribution”:””,”zoom_image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.6.sets.0.zoom_image”,”typename”:”Image”},”zoom_caption”:””,”zoom_attribution”:””,”mobile_zoom_image”:{“type”:”id”,”generated”:true,”id”:”$Post:119930.acf.modules.6.sets.0.mobile_zoom_image”,”typename”:”Image”},”mobile_zoom_caption”:””,”mobile_zoom_attribution”:””,”external_link”:””,”__typename”:”ImageSet”},”$Post:119930.acf.modules.6.sets.0.image”:{“alt”:””,”caption”:””,”url”:” Majorana Demonstrator experiment is now winding down, but the team is forming a new collaboration with an experiment called \u003ca href=\” based at Gran Sasso, to create another experiment probing neutrino mass. Called \u003ca href=\” it will have more massive and thus more sensitive germanium detector arrays. “Legend may be able to push the limits on CSL models further,” said Kim. There are also \u003ca href=\” for \u003ca href=\” these models in space-based experiments, which won’t suffer from noise produced by environmental vibrations.\u003c/p>\n\u003cdiv id=’component-6351596c4f669′ class=”related-list”>\u003cscript type=\”text/template\”>{\”type\”:\”LinkList\”,\”id\”:\”component-6351596c4f669\”,\”data\”:{\”title\”:\”Related:\”,\”class\”:\”related-list\”,\”links\”:[{\”type\”:\”internal\”,\”link\”:\”https:\\/\\/www.quantamagazine.org\\/physicists-rewrite-a-quantum-rule-that-clashes-with-our-universe-20220926\\/\”,\”title\”:\”Physicists Rewrite a Quantum Rule That Clashes With Our Universe\”},{\”type\”:\”internal\”,\”link\”:\”https:\\/\\/www.quantamagazine.org\\/how-big-can-the-quantum-world-be-physicists-probe-the-limits-20210818\\/\”,\”title\”:\”How Big Can the Quantum World Be? Physicists Probe the Limits.\”},{\”type\”:\”internal\”,\”link\”:\”https:\\/\\/www.quantamagazine.org\\/famous-experiment-dooms-pilot-wave-alternative-to-quantum-weirdness-20181011\\/\”,\”title\”:\”Famous Experiment Dooms Alternative to Quantum Weirdness\”},{\”type\”:\”internal\”,\”link\”:\”https:\\/\\/www.quantamagazine.org\\/quantum-theory-rebuilt-from-simple-physical-principles-20170830\\/\”,\”title\”:\”Quantum Theory Rebuilt From Simple Physical Principles\”}]}}\u003c\/script>\u003c/div>\n\u003cp>Falsification is hard work, and rarely reaches a tidy end point. Even now, according to Curceanu, Roger Penrose — who was awarded the \u003ca href=\” Nobel Prize in Physics\u003c/a> for his work on general relativity — is working on a version of the Diósi-Penrose model in which there’s no spontaneous radiation at all.\u003c/p>\n\u003cp>All the same, some suspect that for this view of quantum mechanics, the writing is on the wall. “What we need to do is to rethink what are these models trying to achieve,” said Zych, “and see if the motivating problems may not have a better answer through a different approach.” While few would argue that the measurement problem is no longer an issue, we have also learned much, in the years since the first collapse models were proposed, about what quantum measurement entails. “I think we need to go back to the question of what these models were created for decades ago,” she said, “and take seriously what we have learned in the meantime.”\u003c/p>\n”,”fadein”:false,”__typename”:”ACFContent”},”$Post:119930.acf.series”:{“name”:null,”link”:null,”__typename”:”Term”},”$Post:119930.next.data.0″:{“title”:”Inside the Proton, the ‘Most Complicated Thing You Could Possibly 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Taylor Kitsch Wife, Rumours or Reality?
Is Taylor Kitsch married? Is there any lucky girl who is legally Taylor Kitsch wife? This article will provide in-depth...
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Tolly Saivanidis and Trademarks: A Saga of Intellectual Property Protection
In the realm of intellectual property, trademarks stand as the stalwarts guarding the identity and reputation of businesses. From iconic...
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How Can Headhunter Services Transform Your Hiring Strategy?
Hiring the right people is super important for any business. But sometimes, finding the best candidates can be challenging. This...
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Why Should You Hire React Developers?
A user-friendly and modern architectural website is an essential requirement for businesses. Worry not; in a robust digital world, ReactJS...
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‘Mr. Harrigan’s Telephone’: Stephen King’s long-awaited adaptation opens with ONLY 38% approval
The horror ‘Mr. Harrigan’ (Mr. Harrigan’s Phone), adapted from the eponymous short story by Stephen King, hits Netflix tomorrow (05),...
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“ The Walking Dead ”: Maggie returns in the teaser for season 10
AMC a teaser of the first of additional episodes of the 10th season of “The Walking Dead”. After years of...