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PT-symmetric photonic quantum systems with gain and loss do not exist

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arxiv 1805.10876 v1 pith:NDL5CTS6 submitted 2018-05-28 quant-ph physics.optics

classification quant-phphysics.optics
keywords quantumgainlossphotonicpt-symmetricsystemsassociatedbuilt
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We discuss the impact of gain and loss on the evolution of photonic quantum states and find that PT-symmetric quantum optics in gain/loss systems is not possible. Within the framework of macroscopic quantum electrodynamics we show that gain and loss are associated with non-compact and compact operator transformations, respectively. This implies a fundamentally different way in which quantum correlations between a quantum system and a reservoir are built up and destroyed.

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  1. $\mathcal{PT}$-symmetry from Lindblad dynamics in an optomechanical system

    quant-ph 2019-08 conditional novelty 5.0 of 10

    The strong-to-weak coupling transition in optomechanical state transfer is interpreted as a passive PT-symmetry breaking transition, with exact Lindblad/non-Hermitian agreement only in the single-excitation subspace.

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