Local PT symmetry violates the no-signaling principle

American Physical Society
Publication Type:
Journal Article
Phys. Rev. Lett., 2014, 112 (13)
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Bender et al. have developed PT-symmetric quantum theory as an extension of quantum theory to non-Hermitian Hamiltonians. We show that when this model has a local PT symmetry acting on composite systems it violates the non-signaling principle of relativity. Since the case of global PT symmetry is known to reduce to standard quantum mechanics, this shows that the PT-symmetric theory is either a trivial extension or likely false as a fundamental theory.
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