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RESEARCH PRODUCT
Quantum correlations in PT -symmetric systems
Francesco CiccarelloGabriel T. LandiF. RoccatiG. Massimo PalmaMatteo BrunelliSalvatore Lorenzosubject
PhysicsENTROPIAQuantum discordPhysics and Astronomy (miscellaneous)Materials Science (miscellaneous)quantum correlationsquantum discordNon-Hermitian Hamiltonians01 natural sciencesQuantum OpticsAtomic and Molecular Physics and Optics010305 fluids & plasmasnon-HermitianPT symmetrySymmetric systemsQuantum mechanics0103 physical sciencesElectrical and Electronic Engineering010306 general physicsQuantumdescription
Abstract We study the dynamics of correlations in a paradigmatic setup to observe PT -symmetric physics: a pair of coupled oscillators, one subject to a gain one to a loss. Starting from a coherent state, quantum correlations (QCs) are created, despite the system being driven only incoherently, and can survive indefinitely. Both total and QCs exhibit different scalings of their long-time behavior in the PT -broken/unbroken phase and at the exceptional point (EP). In particular, PT symmetry breaking is accompanied by non-zero stationary QCs. This is analytically shown and quantitatively explained in terms of entropy balance. The EP in particular stands out as the most classical configuration, as classical correlations diverge while QCs vanish.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-01-22 | Quantum Science and Technology |