Quantum mechanics: To be or not to be local

@article{Aspect2007QuantumMT,
  title={Quantum mechanics: To be or not to be local},
  author={Alain Aspect},
  journal={Nature},
  year={2007},
  volume={446},
  pages={866-867}
}
  • A. Aspect
  • Published 19 April 2007
  • Physics
  • Nature
The experimental violation of mathematical relations known as Bell's inequalities sounded the death-knell of Einstein's idea of 'local realism' in quantum mechanics. But which concept, locality or realism, is the problem? Most of us, most of the time, can get along in life and in science with a sturdy concept of what is 'real'. Generally speaking, an external reality exists independent of observation. But in the world of quantum physics, where individual events are predicted only in terms of… 

3 Adrian Wüthrich : Locality , Causality , and Realism in the Derivation of Bell ’ s Inequality

For several years, a significant disagreement has persisted between (mainly) philosophers, and (mainly) physicists concerning the consequences of the empirical violation of Bell’s inequality. On the

Observation of discontinuous particle dynamics in macrocosm: A clue to the problem of "unified" theory

We have observed light-induced spatially-discontinuous electron dynamics of a macroscopic lengthscale. The dynamics proves to be a peculiar type of quantum nonlocality, which is related to the

Every Entangled Stuff Has Its Own Avatar

It is demonstrated that some byproducts resulting from entanglement act as a hinge that link both theories making the completeness of QM clear and a thorough analysis of the non-locality of this effect will be carried out.

How the instant collapse of a spatially-extended quantum state is consistent with the relativity of simultaneity

A thought experiment is considered on the observation of the instantaneous collapse of an extended wave packet. According to the relativity of simultaneity, such a collapse being instantaneous in

Bell's Theorem and Hidden Variable Theories

Although standard quantum mechanics is compatible with experiments, it could not clarify some important unsolved problems like quantum reality and measurement process. Hidden variable theories

A Realist Analysis of Six Controversial Quantum Issues

  • A. Hobson
  • Physics
    Mario Bunge: A Centenary Festschrift
  • 2019
This essay provides a philosophically realistic analysis of six phenomena central to the authors' current confusion: quantization, field-particle duality, superposition, entanglement, nonlocality, and measurement, which concurs with the scientific paradigm as it has been known since Copernicus.

There are no particles, there are only fields

Quantum foundations are still unsettled, with mixed effects on science and society. By now it should be possible to obtain consensus on at least one issue: Are the fundamental constituents fields or

How can a random phenomenon between particles be synchronized instantaneously and independently of the distance between said particles?

Entanglement is a random phenomenon that is instantly synchronized, regardless of the space that mediates between entangled particles. However, the instantaneous transmission of information using

A non-local hidden-variable model that violates Leggett-type inequalities

Recent experiments of Groblacher et al proved the violation of a Leggett-type inequality that was claimed to be valid for a broad class of non-local hidden-variable theories. The impossibility of

Orbital angular momentum entanglement

Entanglement in higher dimensions is an attractive concept that is a chal- lenge to realise experimentally. To this end, the entanglement of the orbital angular momentum (OAM) of photons holds
...

References

SHOWING 1-10 OF 14 REFERENCES

Can Quantum-Mechanical Description of Physical Reality Be Considered Complete?

Consideration of the problem of making predictions concerning a system on the basis of measurements made on another system that had previously interacted with it leads to the result that one is led to conclude that the description of reality as given by a wave function is not complete.

Reply to ``Comment on `Classical interventions in quantum systems. II. Relativistic Invariance' ''

Contrary to the claim in the preceding Comment, the operators that describe the complete time evolution of a quantum system have a covariant transformation law, even though they are built from

Violation of Bell's Inequality under Strict Einstein Locality Conditions

We observe strong violation of Bell's inequality in an Einstein-Podolsky-Rosen-type experiment with independent observers. Our experiment definitely implements the ideas behind the well-known work by

Proposed Experiment to Test Local Hidden Variable Theories.

A theorem of Bell, proving that certain predictions of quantum mechanics are inconsistent with the entire family of local hidden-variable theories, is generalized so as to apply to realizable

Quantum technology: the second quantum revolution

  • J. DowlingG. Milburn
  • Physics
    Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences
  • 2003
A number of examples of research programs that could deliver quantum technologies in coming decades including: quantum information technology, quantum electromechanical systems, coherent quantum electronics, quantum optics and coherent matter technology are discussed.

Violation of Bell Inequalities by Photons More Than 10 km Apart

A Franson-type test of Bell inequalities by photons 10.9 km apart is presented. Energy-time entangled photon pairs are measured using two-channel analyzers, leading to a violation of the inequalities

Bell's inequality test: more ideal than ever

The experimental violation of Bell's inequalities confirms that a pair of entangled photons separated by hundreds of metres must be considered a single non-separable object — it is impossible to

Experimental Test of Bell's Inequalities Using Time- Varying Analyzers

Correlations of linear polarizations of pairs of photons have been measured with time-varying analyzers. The analyzer in each leg of the apparatus is an acousto-optical switch followed by two linear

The Born-Einstein Letters

  • M. Bredig
  • Physics, Environmental Science
    Science
  • 1973
A convincing relation between the solar magnetic sector structure and the earth's meteorological activity as indicated by vorticity at the 300-millibar level is shown.

Descartes' Error: Emotion, Reason and the Human Brain

Brain books are similarly popular: humans are considered from a pathological/laboratory perspective and computer metaphors abound (your mind is your software!) and there are boxes and arrows in profusion.