Quantum Steering in Two- and Three-Mode ??-Symmetric Systems

Duc, Vinh Le; Kalaga, J. K.; Leoński, W.; Nowotarski, Mateusz; Gruszka, K.; Kostrzewa, M.

doi:10.3390/sym13112201

Cited by 5 publications

(1 citation statement)

References 41 publications

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“…Models based on PTsymmetric Hamiltonians and their EPs can also be found in microwave photonics [34], plasmonics [35] (for a review see [36]), electronics [37,38], metamaterials [39], cavity optomechanics [40][41][42], and acoustics [43,44]. Moreover, problems related to PT symmetry were considered in the context of quantum steering [45], stability of the hydrogen molecule [46], and even finding energy levels for hydrogen bridge in nanojunctions with metallic anchors [47].…”

Section: Introductionmentioning

confidence: 99%

Incoherent amplification cannot compensate for nonclassicality loss in PT-symmetric systems

Peřina¹,

Miranowicz²,

Kalaga³

et al. 2023

Preprint

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We show that the loss of nonclassicality (including quantum entanglement) cannot be compensated by the (incoherent) amplification of PT -symmetric systems. We address this problem by manipulating the quantum fluctuating forces in the Heisenberg-Langevin approach. Specifically, we analyze the dynamics of two nonlinearly coupled oscillator modes in a PT -symmetric system. An analytical solution allows us to separate the contribution of reservoir fluctuations from the evolution of quantum statistical properties of the modes. In general, as reservoir fluctuations act constantly, the complete loss of nonclassicality and entanglement is observed for long times. To elucidate the role of reservoir fluctuations in a long-time evolution of nonclassicality and entanglement, we consider and compare the predictions from two alternative models in which no fatal long-time detrimental effects on the nonclassicality and entanglement are observed. This is so as, in the first semiclassical model, no reservoir fluctuations are considered at all. This, however, violates the fluctuation-dissipation theorem. The second, more elaborated, model obeys the fluctuation-dissipation relations as it partly involves reservoir fluctuations. However, to prevent from the above long-time detrimental effects, the reservoir fluctuations have to be endowed with the nonphysical properties of a sink model. In both models, additional incorporation of the omitted reservoir fluctuations results in their physically consistent behavior. This behavior, however, predicts the gradual loss of the nonclassicality and entanglement. Thus the effects of reservoir fluctuations related to damping cannot be compensated by those related to amplification. This qualitatively differs from the influence of damping and amplification to a direct coherent dynamics of PT -symmetric systems in which their mutual interference results in a periodic behavior allowing for nonclassicality and entanglement at arbitrary times.

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Section: Introductionmentioning

confidence: 99%

Incoherent amplification cannot compensate for nonclassicality loss in PT-symmetric systems

Peřina¹,

Miranowicz²,

Kalaga³

et al. 2023

Preprint

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Quantum steering in a PT-symmetric system of three cavities with a linear coupling between the active and passive cavities

Hoang Minh,

Le Duc,

Doan Quoc

et al. 2023

Optik

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Integrability and trajectory confinement in -symmetric waveguide arrays

Barashenkov

Smuts

Chernyavsky

2023

J. Phys. A: Math. Theor.

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We consider $\mathcal{PT}$-symmetric ring-like arrays of optical waveguides with purely nonlinear  gain and loss. Regardless of the value of the gain-loss coefficient, these systems are protected from spontaneous $\mathcal{PT)$-symmetry breaking.  If the nonhermitian part of the array matrix has cross-compensating structure,  the total power in such a system remains bounded --- or even constant --- at all times.  We identify two-, three-, and four-waveguide arrays with cross-compensatory nonlinear gain and lossthat constitute completely integrable Hamiltonian systems.

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Quantum Steering in Two- and Three-Mode ??-Symmetric Systems

Cited by 5 publications

References 41 publications

Incoherent amplification cannot compensate for nonclassicality loss in PT-symmetric systems

Incoherent amplification cannot compensate for nonclassicality loss in PT-symmetric systems

Quantum steering in a PT-symmetric system of three cavities with a linear coupling between the active and passive cavities

Integrability and trajectory confinement in -symmetric waveguide arrays

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