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Title: Consistency of PT-symmetric quantum mechanics
Authors: Brody, DC
Keywords: PT symmetry;Biorthogonal quantum mechanics;Open quantum systems
Issue Date: 2016
Publisher: IOP
Citation: Journal of Physics A: Mathematical and General,49, (10): 9pp, (2016)
Abstract: In recent reports, suggestions have been put forward to the effect that parity and time-reversal (PT) symmetry in quantum mechanics is incompatible with causality. It is shown here, in contrast, that PT-symmetric quantum mechanics is fully consistent with standard quantum mechanics. This follows from the surprising fact that the much-discussed metric operator on Hilbert space is not physically observable. In particular, for closed quantum systems in finite dimensions there is no statistical test that one can perform on the outcomes of measurements to determine whether the Hamiltonian is Hermitian in the conventional sense, or PT-symmetric---the two theories are indistinguishable. Nontrivial physical effects arising as a consequence of PT symmetry are expected to be observed, nevertheless, for open quantum systems with balanced gain and loss.
ISSN: 1751-8113
Appears in Collections:Dept of Mathematics Research Papers

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