Preferred basis in quantum theory and the problem of classicalization of the quantum Universe

A. O. Barvinsky; A. Yu. Kamenshchik

doi:10.1103/physrevd.52.743

Preferred basis in quantum theory and the problem of classicalization of the quantum Universe

Physical Review D ◽

10.1103/physrevd.52.743 ◽

1995 ◽

Vol 52 (2) ◽

pp. 743-757 ◽

Cited By ~ 15

Author(s):

A. O. Barvinsky ◽

A. Yu. Kamenshchik

Keyword(s):

Quantum Theory ◽

Preferred Basis ◽

Quantum Universe

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A Stronger Theorem Against Macro-realism

Quantum ◽

10.22331/q-2017-07-14-13 ◽

2017 ◽

Vol 1 ◽

pp. 13 ◽

Cited By ~ 4

Author(s):

John-Mark A. Allen ◽

Owen J. E. Maroney ◽

Stefano Gogioso

Keyword(s):

Quantum Theory ◽

Quantum Universe ◽

Traditional Understanding ◽

Rule Out

Macro-realism is the position that certain macroscopic observables must always possess definite values: e.g. the table is in some definite position, even if we do not know what that is precisely. The traditional understanding is that by assuming macro-realism one can derive the Leggett-Garg inequalities, which constrain the possible statistics from certain experiments. Since quantum experiments can violate the Leggett-Garg inequalities, this is taken to rule out the possibility of macro-realism in a quantum universe. However, recent analyses have exposed loopholes in the Leggett-Garg argument, which allow many types of macro-realism to be compatible with quantum theory and hence violation of the Leggett-Garg inequalities. This paper takes a different approach to ruling out macro-realism and the result is a no-go theorem for macro-realism in quantum theory that is stronger than the Leggett-Garg argument. This approach uses the framework of ontological models: an elegant way to reason about foundational issues in quantum theory which has successfully produced many other recent results, such as the PBR theorem.

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