Protection of quantum Fisher information in entangled states via classical driving

Ren, Yu-Kun; Tang, La-Mei; Zeng, Hao‐Sheng

doi:10.1007/s11128-016-1444-3

Cited by 18 publications

(10 citation statements)

References 29 publications

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“…Decoherence always acts as a drawback, limiting the precision in the measurement outcomes [44][45][46]. To tackle this issue, proposals to control QFI against environmental noise have been provided [47][48][49][50][51][52][53][54][55][56][57].…”

Section: Introductionmentioning

confidence: 99%

Quantum enhancement of qutrit dynamics through driving field and photonic band-gap crystal

Yousefi,

Mortezapour,

Naeimi

et al. 2022

Preprint

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A comparative study of a qutrit (three-level atomic system) coupled to a classical field in a typical Markovian reservoir (free space) and in a photonic band-gap (PBG) crystal is carried out. The aim of the study is to assess the collective impact of structured environment and classical control of the system on the dynamics of quantum coherence, non-Markovianity, and estimation of parameters which are initially encoded in the atomic state. We show that the constructive interplay of PBG material as a medium and classical driving field as a part of system results in a significant enhancement of all the quantum traits of interest, compared to the case when the driven qutrit is in a Markovian environment. Our results supply insights for preserving and enhancing quantum features in qutrit systems which are promising alternative candidates to be used in quantum processors instead of qubits.

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Section: Introductionmentioning

confidence: 99%

Quantum enhancement of qutrit dynamics through driving field and photonic band-gap crystal

Yousefi,

Mortezapour,

Naeimi

et al. 2022

Preprint

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“…It was shown that the entanglement between two such qubits, which are embedded in two independent cavities, can be preserved for a long time [52]. Moreover, non-Markovianity [53][54][55], quantum Fisher information [56,57], quantum speedup [54], coherence dynamics [58] and quantumness [55] of such a model have been studied.…”

Section: Introductionmentioning

confidence: 99%

The effect of classical driving field on the spectrum of a qubit and entanglement swapping inside dissipative cavities

Mortezapour

Nourmandipour

Gholipour

2020

Quantum Inf Process

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In this paper, we study the effect of classical driving field on the spontaneous emission spectrum of a qubit embedded in a dissipative cavity. Furthermore, we monitor the entanglement dynamics of the driven qubit with its radiative decay under the action of the classical field. Afterwards, we carry out an investigation on the possibility of entanglement swapping between two such distinct driven qubits. The swapping will be feasible with the aid of a Bell state measurement performing on the photons leaving the cavities. It is demonstrated that the classical driving field has a beneficial effect on the prolonging of the swapped entanglement.

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“…It is thus important to protect the QFI from decoherence. In this regards, a substantial amount of literature has been devoted to find strategies for controlling QFI against detrimental noise [39][40][41][42][43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Validating and controlling quantum enhancement against noise by the motion of a qubit

2020

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Experimental validation and control of quantum traits for an open quantum system are important for any quantum information purpose. We consider a traveling atom qubit as a quantum memory with adjustable velocity inside a leaky cavity, adopting a quantum witness as a figure of merit for quantumness assessment. We show that this model constitutes an inherent physical instance where the quantum witness does not work properly if not suitably optimized. We then supply the optimal intermediate blind measurements which make the quantum witness a faithful tester of quantum coherence. We thus find that larger velocities protect quantumness against noise, leading to lifetime extension of hybrid qubit-photon entanglement and to higher phase estimation precision. Control of qubit motion thus reveals itself as a quantum enhancer. arXiv:1911.07146v1 [quant-ph]

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Protection of quantum Fisher information in entangled states via classical driving

Cited by 18 publications

References 29 publications

Quantum enhancement of qutrit dynamics through driving field and photonic band-gap crystal

Quantum enhancement of qutrit dynamics through driving field and photonic band-gap crystal

The effect of classical driving field on the spectrum of a qubit and entanglement swapping inside dissipative cavities

Validating and controlling quantum enhancement against noise by the motion of a qubit

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