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Lettere al nuovo cimento della societa italiana di fisica/Lettere al nuovo cimento

On Popper’s new EPR-experiment

Donald Bedford, F. Selleri

Published Apr 1, 1985• 19 citations
Publisher
DOI
10.1007/bf02747046

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Summary form only given. In early 1930's, Karl Popper, a metaphysical realist, proposed a thought experiment to support his realistic interpretation of quantum mechanics, which shared the same goal of the EPR gedankenexperiment. Based on the same EPR two-particle entangled state, Popper asked: if the precise position of particle 2 is known due to the precise measurement of the position for its entangled twin particle 1, does particle 2 experience a greater uncertainty in its momentum? This question has been ignored for many years. One may not like Popper's philosophy of quantum mechanics; however, his question is closely related to an important problem in recent hot applications: what one can predict for the remaining parts of an entangled state if one of the subsystems is measured alone? We have realized Popper's experiment with the use of entangled two-photon source of spontaneous parametric down conversion. We conclude from this experiment: in an entangled two-particle system, the precise knowledge of the position of a particle, which is determined by the two-particle entanglement, does not necessarily produce an uncertainty in its momentum.

Quantum Electronics and Laser Science Conference•Jan 20, 2003•0 citations

Popper's experiment and the interpretation of quantum mechanics.

Georgios Zouros

Popper invented a thought experiment that is alleged to test the Copenhagen interpretation of Quantum mechanics, though not the theory itself. In particular it is alleged to test the application of the Heisenberg uncertainty principle to indirect measurements. The experiment is similar to the EPR thought experiment, but it suffers from some technical flaws. These flaws are examined to see if they affect the validity of the argument; so long as they can be alleviated by technical means, the argument retains its force. The experiment has been recently instantiated, with some resolutions of these technical flaws. The results, on face value seem to vindicate Popper and to indicate a violation of the uncertainty principle. Nevertheless, Kim and Shih, who carried out the experiment, give their own interpretation that suggests that the principle should be considered intact but that the correct way to understand the results is to adopt a new metaphysics. Others suggest different reasons why the results do not amount to a violation of the uncertainty principle. Despite a variety of responses, which are carefully examined, the general point that an interpretation cannot alter the empirical basis of a theory is shown to be true. The importance of Rigolid's work in this connection is emphasized.

•Jan 1, 2007•1 citation
Summary form only given. In early 1930's, Karl Popper, a metaphysical realist, proposed a thought experiment to support his realistic interpretation of quantum mechanics, which shared the same goal of the EPR gedankenexperiment. Based on the same EPR two-particle entangled state, Popper asked: if the precise position of particle 2 is known due to the precise measurement of the position for its entangled twin particle 1, does particle 2 experience a greater uncertainty in its momentum? This question has been ignored for many years. One may not like Popper's philosophy of quantum mechanics; however, his question is closely related to an important problem in recent hot applications: what one can predict for the remaining parts of an entangled state if one of the subsystems is measured alone? We have realized Popper's experiment with the use of entangled two-photon source of spontaneous parametric down conversion. We conclude from this experiment: in an entangled two-particle system, the precise knowledge of the position of a particle, which is determined by the two-particle entanglement, does not necessarily produce an uncertainty in its momentum.
Popper invented a thought experiment that is alleged to test the Copenhagen interpretation of Quantum mechanics, though not the theory itself. In particular it is alleged to test the application of the Heisenberg uncertainty principle to indirect measurements. The experiment is similar to the EPR thought experiment, but it suffers from some technical flaws. These flaws are examined to see if they affect the validity of the argument; so long as they can be alleviated by technical means, the argument retains its force. The experiment has been recently instantiated, with some resolutions of these technical flaws. The results, on face value seem to vindicate Popper and to indicate a violation of the uncertainty principle. Nevertheless, Kim and Shih, who carried out the experiment, give their own interpretation that suggests that the principle should be considered intact but that the correct way to understand the results is to adopt a new metaphysics. Others suggest different reasons why the results do not amount to a violation of the uncertainty principle. Despite a variety of responses, which are carefully examined, the general point that an interpretation cannot alter the empirical basis of a theory is shown to be true. The importance of Rigolid's work in this connection is emphasized.