Quantum entanglement for two qubits in a nonstationary cavity

Berman, Oleg L.; Kezerashvili, Roman Ya.; Lozovik, Yu. E.

doi:10.1103/physreva.94.052308

Cited by 11 publications

(25 citation statements)

References 24 publications

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“…Various aspects of the problem of entanglement in systems with moving mirrors (or their analogs) were considered in Refs. [143,144,333,346,361,363,[524][525][526][527][528][529][530][531][532][533][534][535][536][537][538][539]. The quantum discord in the DCE was the subject of studies [333,540].…”

Section: Entanglementmentioning

confidence: 99%

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Fifty Years of the Dynamical Casimir Effect

Dodonov

2020

Physics

158

105

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Section: Entanglementmentioning

confidence: 99%

“…The Dynamical Lamb Effect, introduced in [545], consists of the excitation of atoms inside a cavity with moving walls, without creation of real photons in the cavity. For further studies, one can consult papers [348,349,523,[533][534][535][546][547][548].…”

Section: Other Dynamical Effectsmentioning

confidence: 99%

Fifty Years of the Dynamical Casimir Effect

Dodonov

2020

Physics

158

105

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“…Ref. [49] considered a generation of entanglement of two qubits in absence of energy dissipation under the nonadiabatic modulation of cavity frequency leading to the dynamical Casimir effect [52][53][54]. This parametric process is able to create finite quantum concurrence, but it remains weak in the limit of a weak qubit-cavity interaction and in the case of a single switching of a cavity frequency.…”

Section: B the Effect Of Qubit Relaxationmentioning

confidence: 99%

Parametrically driven hybrid qubit-photon systems: Dissipation-induced quantum entanglement and photon production from vacuum

et al. 2017

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We consider a dissipative evolution of parametrically-driven qubits-cavity system under the periodical modulation of coupling energy between two subsystems, which leads to the amplification of counterrotating processes. We reveal a very rich dynamical behavior of this hybrid system. In particular, we find that the energy dissipation in one of the subsystems can enhance quantum effects in another subsystem. For instance, optimal cavity decay assists to stabilize entanglement and quantum correlations between qubits even in the steady state and to compensate finite qubit relaxation. On the contrary, energy dissipation in qubit subsystem results in the enhanced photon production from vacuum for strong modulation, but destroys both quantum concurrence and quantum mutual information between qubits. Our results provide deeper insights to nonstationary cavity quantum electrodynamics in context of quantum information processing and might be of importance for dissipative quantum state engineering.

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“…With such an effect, interesting phenomena also arise in quantum electrodynamics in a cavity such as the dynamic Lamb effect (see Refs. [26,33] and references therein). In fact, quantum entanglement should appear immediately upon the above-described appearance of intervalley excitons after pumping with linearly polarized light.…”

Section: Possible Physical Realizationsmentioning

confidence: 99%

“…Recently, the conditional concurrence created by the dynamical Lamb effect of two qubits within a microcavity which changes its frequency suddenly was calculated [26]. In this paper, we follow the same protocol, and find the concurrence created by two pseudomagnetic excitons on a graphene sheet under strain embedded in a microcavity interacting with one of its modes in the rotating wave approximation (RWA).…”

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confidence: 97%

Quantum entanglement between excitons in two-dimensional materials

Martins,

Berman,

Gumbs

et al. 2021

Preprint

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The quantum entanglement between two excitons in two-dimensional materials, embedded in an optical microcavity, was investigated. The energy eigenstates of a Jaynes-Cummings like Hamiltonian for two qubits coupled to a single cavity mode have been calculated. The quantum entanglement between such states was estimated by calculating the concurrence between two qubits in each of these eigenstates. According to the results of our calculations, if the system is allowed to decay only through the emission of cavity photons at low temperatures, there is a maximally entangled eigenstate, protected from decay. We demonstrated that the existence of such a state results in the counter-intuitive conclusion that, for some initial states of the system, the fact that the cavity is leaky can actually lead to an increase in the average concurrence on the timescales of the average photonic lifetime. In addition, we calculated the time evolution of the concurrence between a pair of excitons in a strained graphene monolayer.

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Quantum entanglement for two qubits in a nonstationary cavity

Cited by 11 publications

References 24 publications

Fifty Years of the Dynamical Casimir Effect

Fifty Years of the Dynamical Casimir Effect

Parametrically driven hybrid qubit-photon systems: Dissipation-induced quantum entanglement and photon production from vacuum

Quantum entanglement between excitons in two-dimensional materials

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