Probing nonclassicality under dissipation

Ali, Md. Manirul; Chen, Po−Wen

doi:10.1088/1751-8121/aa8bd8

Cited by 2 publications

(2 citation statements)

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“…In this regard, a violation of the Leggett-Garg inequality will disclose the existence of non-classical temporal correlations in the dynamics of an individual system [13,14]. This has led to a substantial amount of literature attempting to characterize system non-classicality by Leggett-Garg inequalities both theoretically [15][16][17][18][19] and experimentally [20,21]. Along this direction, robust quantum witnesses have been then introduced as alternative to the Leggett-Garg inequality, which may help in reducing the experimental requirements in verifying quantum coherence in complex systems [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Quantumness and memory of one qubit in a dissipative cavity under classical control

et al. 2020

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Hybrid quantum-classical systems constitute a promising architecture for useful control strategies of quantum systems by means of a classical device. Here we provide a comprehensive study of the dynamics of various manifestations of quantumness with memory effects, identified by non-Markovianity, for a qubit controlled by a classical field and embedded in a leaky cavity. We consider both Leggett-Garg inequality and quantum witness as experimentally-friendly indicators of quantumness, also studying the geometric phase of the evolved (noisy) quantum state. We show that, under resonant qubit-classical field interaction, a stronger coupling to the classical control leads to enhancement of quantumness despite a disappearance of non-Markovianity. Differently, increasing the qubit-field detuning (out-of-resonance) reduces the nonclassical behavior of the qubit while recovering non-Markovian features. We then find that the qubit geometric phase can be remarkably preserved irrespective of the cavity spectral width via strong coupling to the classical field. The controllable interaction with the classical field inhibits the effective time-dependent decay rate of the open qubit. These results supply practical insights towards a classical harnessing of quantum properties in a quantum information scenario.

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Section: Introductionmentioning

confidence: 99%

“…indicating the anticommutator of the two operators. Utilizing similar arguments, one can also obtain a Leggett-Garg inequality for measurements at four different times, t 1 , t 2 , t 3 and t 4 = t 1 + 3τ, given by[15,16] …”

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confidence: 99%