How so? QM reduces to physics - however radical. Why would you insist that this causal link will not? (If thereis a causal link).
I decided to anticipate the rejection/dismissal of my initial response:
"Whatever position one takes on the subject, quantum theory is certainly surprising in its radical break from other fields of physics. Not only does it exhibit indeterminism, but the theory entails an essential denial of objectivity, an abandonment of realism."
Hemmick, D. L., & Shakur, A. M. (2011).
Bell's theorem and quantum realism: reassessment in light of the Schrödinger paradox (
Springer Briefs in Physics). Springer.
at least as it really isn't fair to use one source to make such a claim about a subject another isn't familiar with. However, as I wasn't asked for citations and quotations and so forth, I also don't wish to pepper you with dozens of quotations or hundreds of references, so I tried to pick a few that were
1) Accessible (I think) even to one without a background in physics
2) From peer-reviewed journals and preferably the top journals in the word
3) As concise as possible
So here goes:
“The laws of quantum physics are in conflict with a classical world, in particular, with local and macroscopic realism as characterized by the violation of the Bell and Leggett-Garg inequalities, respectively.”
Kofler, J., & Brukner, Č. (2008). Conditions for quantum violation of macroscopic realism.
Physical review letters,
101(9), 090403.
“Theories designed according to “local realism” (LR) include a set of hidden variables, which if known would predict all measurement results; however, the values of the hidden variables cannot be influenced by spacelike-separated events. In 1964, Bell constructed an inequality satisfied by all correlations accessible by LR and showed that correlations between spacelike-separated measurements on two quantum systems can violate this inequality. Since then, many experimental tests showing Bell-inequality violations have been performed. The importance of such a test is twofold. First, it shows that local realistic (LR) descriptions of bipartite quantum systems do not always exist. Second, it supports quantum information tasks such as quantum key distribution and randomness generation. Particularly in the second case, a successful test is required to reject LR with very high significance in the presence of adversarial effects.”
Zhang, Y., Glancy, S., & Knill, E. (2013). Efficient quantification of experimental evidence against local realism.
Physical Review A,
88(5), 052119.
“Bell's theorem for local realism is a highly developed research field, not least because of its importance for quantum information technologies. Macroscopic realism (macrorealism) —the world view in which the properties of macroscopic objects exist independent of and are not influenced by measurement—has gained momentum only within the past few years as experiments steadily approached the parameter regime where experimental tests might become possible. Promising candidates in the race towards an experimental violation of macrorealism are large superconducting devices, heavy molecules, and quantum-optical systems in combination with atomic gases or massive objects. Still lacking a decisive experiment, however, the physics community remains to be split into two groups: adherents of the viewpoint that macrorealism will eventually be falsified by the preparation of Schrödinger catlike states, and adherents of one of the hypothetical alternatives saving a classical world on the macroscopic level”
Kofler, J., & Brukner, Č. (2013). Condition for macroscopic realism beyond the Leggett-Garg inequalities.
Physical Review A,
87(5), 052115.
“The development of quantum physics has revealed a world quite different from the one depicted by classical physics. Probably the most striking feature of the quantum world, distinguishing it from the classical one, is failure of local realism. Local realism combines two reasonably acceptable assumptions, locality and realism. The principle of locality is that distant objects cannot have direct instantaneous influence on one another. Physical realism claims that all measurement outcomes are determined by preexisting quantities of physical systems. The failure of local realism is evidenced by violation of Bell’s famous inequality which should be obeyed by any local-realistic theories.”
Jeong, H., Paternostro, M., & Ralph, T. C. (2009). Failure of local realism revealed by extremely-coarse-grained measurements.
Physical review letters,
102(6), 060403.
“We report the first experimental violation of local realism by four-photon Greenberger-Horne-Zeilinger (GHZ) entanglement. In the experiment, the nonstatistical GHZ conflicts between quantum mechanics and local realism are confirmed, within the experimental accuracy, by four specific measurements of polarization correlations between four photons. In addition, our experimental results also demonstrate a strong violation of Mermin-Ardehali-Belinskii-Klyshko inequality by 76 standard deviations. Such a violation can only be attributed to genuine four-photon entanglement.”
Zhao, Z., Yang, T., Chen, Y. A., Zhang, A. N., Żukowski, M., & Pan, J. W. (2003). Experimental violation of local realism by four-photon Greenberger-Horne-Zeilinger entanglement.
Physical review letters,
91(18), 180401.
“Our study has shed some light on the persistent issue of the emergence of classical realism in closed quantum systems, specifically the breakdown of MR by the measurement process. We have shown that the principles of classical mechanics cannot describe even the measurement of macroscopic observables with a smooth classical limit.”
Leshem, A., & Gat, O. (2009). Violation of smooth observable macroscopic realism in a harmonic oscillator.
Physical review letters,
103(7), 070403.
