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yalefield金蟲(chóng) (文壇精英)
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波函數(shù)----并非統(tǒng)計(jì)工具而是物理真實(shí) 【轉(zhuǎn)】 已有14人參與
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http://www.edu.cn/ren_yu_zi_ran_ ... 111220_721232.shtml 在《Nature》雜志公布2011年最受歡迎的十大新聞中，排名第6的是： 波函數(shù)并非統(tǒng)計(jì)工具而是物理真實(shí) 據(jù)《自然》雜志網(wǎng)站2011年11月17日?qǐng)?bào)道，波函數(shù)是量子力學(xué)中一個(gè)重要且令人費(fèi)解的核心概念，物理學(xué)家用它來(lái)確定量子粒子具備某種特性的概率，而英國(guó)科學(xué)家2011年11月14日發(fā)表在arXiv。org網(wǎng)站的一篇論文則提出了一個(gè)新觀點(diǎn)： 波函數(shù)并非統(tǒng)計(jì)工具而是物理真實(shí) 由英國(guó)帝國(guó)理工學(xué)院的馬修·皮由茲領(lǐng)導(dǎo)的三人科學(xué)小組在最新發(fā)表的論文中指出，如果波函數(shù)純粹只是統(tǒng)計(jì)工具的話，那么，時(shí)間和空間中互不連貫的量子狀態(tài)都將可以相互“交流”，這聽(tīng)起來(lái)有點(diǎn)不可思議，很難成立，因此波函數(shù)必定是物理真實(shí)。 研究人員之一、美國(guó)南加州克萊姆森大學(xué)的理論物理學(xué)家安東尼·瓦倫提尼表示：“我們的這篇論文可能具有顛覆效應(yīng)，在量子力學(xué)中，它可能是繼貝爾定理之后最重要的結(jié)論�！� 英國(guó)牛津大學(xué)的物理學(xué)家戴維·華萊士表示，這個(gè)理論是他15年的職業(yè)生涯內(nèi)看到的量子力學(xué)基礎(chǔ)領(lǐng)域最重要的結(jié)論。他說(shuō)：“這一理論表明，人們不能將量子狀態(tài)解釋為一種概率。” 自上世紀(jì)20年代開(kāi)始，科學(xué)界在如何理解波函數(shù)方面就存在很大爭(zhēng)議。丹麥最著名的科學(xué)家、哥本哈根大學(xué)的尼爾斯·玻爾開(kāi)創(chuàng)的“哥本哈根解釋”認(rèn)為，波函數(shù)是一個(gè)計(jì)算工具：當(dāng)被用來(lái)計(jì)算粒子擁有不同特性的可能性時(shí)，它能給出正確的結(jié)論。 |
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natinn
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yalefield
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Nature網(wǎng)站的報(bào)導(dǎo)： Quantum theorem shakes foundations http://www.nature.com/news/quant ... -foundations-1.9392 Nature doi:10.1038/nature.2011.9392 The wavefunction is a real physical object after all, say researchers. Eugenie Samuel Reich 17 November 2011 Mathematical device or physical fact? The elusive nature of the quantum wavefunction may be pinned down at last. At the heart of the weirdness for which the field of quantum mechanics is famous is the wavefunction, a powerful but mysterious entity that is used to determine the probabilities that quantum particles will have certain properties. Now, a preprint posted online on 14 November1 reopens the question of what the wavefunction represents — with an answer that could rock quantum theory to its core. Whereas many physicists have generally interpreted the wavefunction as a statistical tool that reflects our ignorance of the particles being measured, the authors of the latest paper argue that, instead, it is physically real. “I don't like to sound hyperbolic, but I think the word 'seismic' is likely to apply to this paper,” says Antony Valentini, a theoretical physicist specializing in quantum foundations at Clemson University in South Carolina. Valentini believes that this result may be the most important general theorem relating to the foundations of quantum mechanics since Bell’s theorem, the 1964 result in which Northern Irish physicist John Stewart Bell proved that if quantum mechanics describes real entities, it has to include mysterious “action at a distance”. Action at a distance occurs when pairs of quantum particles interact in such a way that they become entangled. But the new paper, by a trio of physicists led by Matthew Pusey at Imperial College London, presents a theorem showing that if a quantum wavefunction were purely a statistical tool, then even quantum states that are unconnected across space and time would be able to communicate with each other. As that seems very unlikely to be true, the researchers conclude that the wavefunction must be physically real after all. David Wallace, a philosopher of physics at the University of Oxford, UK, says that the theorem is the most important result in the foundations of quantum mechanics that he has seen in his 15-year professional career. “This strips away obscurity and shows you can’t have an interpretation of a quantum state as probabilistic,” he says. The debate over how to understand the wavefunction goes back to the 1920s. In the ‘Copenhagen interpretation’ pioneered by Danish physicist Niels Bohr, the wavefunction was considered a computational tool: it gave correct results when used to calculate the probability of particles having various properties, but physicists were encouraged not to look for a deeper explanation of what the wavefunction is. Albert Einstein also favoured a statistical interpretation of the wavefunction, although he thought that there had to be some other as-yet-unknown underlying reality. But others, such as Austrian physicist Erwin Schrödinger, considered the wavefunction, at least initially, to be a real physical object. The Copenhagen interpretation later fell out of popularity, but the idea that the wavefunction reflects what we can know about the world, rather than physical reality, has come back into vogue in the past 15 years with the rise of quantum information theory, Valentini says. Rudolph and his colleagues may put a stop to that trend. Their theorem effectively says that individual quantum systems must “know” exactly what state they have been prepared in, or the results of measurements on them would lead to results at odds with quantum mechanics. They declined to comment while their preprint is undergoing the journal-submission process, but say in their paper that their finding is similar to the notion that an individual coin being flipped in a biased way — for example, so that it comes up 'heads' six out of ten times — has the intrinsic, physical property of being biased, in contrast to the idea that the bias is simply a statistical property of many coin-flip outcomes. Quantum information Robert Spekkens, a physicist at the Perimeter Institute for Theoretical Physics in Waterloo, Canada, who has favoured a statistical interpretation of the wavefunction, says that Pusey's theorem is correct and a “fantastic” result, but that he disagrees about what conclusion should be drawn from it. He favours an interpretation in which all quantum states, including non-entangled ones, are related after all. Spekkens adds that he does expect the theorem to have broader consequences for physics, as have Bell’s and other fundamental theorems. No one foresaw in 1964 that Bell’s theorem would sow the seeds for quantum information theory and quantum cryptography — both of which rely on phenomena that aren’t possible in classical physics. Spekkens thinks this theorem may ultimately have a similar impact. “It’s very important and beautiful in its simplicity,” he says. [ Last edited by yalefield on 2012-4-2 at 02:13 ] |
2樓2012-04-02 02:08:52
yalefield
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franch: 金幣+2, 鼓勵(lì)交流。。。。。呵呵 2012-04-02 09:58:16
franch: 金幣+2, 鼓勵(lì)交流。。。。。呵呵 2012-04-02 09:58:16
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附件是那篇論文。 Matthew F. Pusey, Jonathan Barrett, Terry Rudolph The quantum state cannot be interpreted statistically arXiv:1111.3328v1 http://xxx.lanl.gov/abs/1111.3328 |
» 本帖附件資源列表
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4樓2012-04-02 09:13:38
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