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

Nosrati, Farzam; Mortezapour, Ali; Franco, Rosario Lo

doi:10.1103/physreva.101.012331

Cited by 24 publications

(17 citation statements)

References 92 publications

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“…Generally, revivals of quantum correlations in composite quantum systems are a useful dynamical feature against these effects [70][71][72][73]. Different experimental methods and theoretical approaches to protect quantum resources have been put forward in [74][75][76][77][78][79][80][81].…”

Section: Discussionmentioning

confidence: 99%

Lindblad Dynamics and Disentanglement in Multi-Mode Bosonic Systems

Kiselev

Ali

Rybin

2021

Entropy

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In this paper, we consider the thermal bath Lindblad master equation to describe the quantum nonunitary dynamics of quantum states in a multi-mode bosonic system. For the two-mode bosonic system interacting with an environment, we analyse how both the coupling between the modes and the coupling with the environment characterised by the frequency and the relaxation rate vectors affect dynamics of the entanglement. We discuss how the revivals of entanglement can be induced by the dynamic coupling between the different modes. For the system, initially prepared in a two-mode squeezed state, we find the logarithmic negativity as defined by the magnitude and orientation of the frequency and the relaxation rate vectors. We show that, in the regime of finite-time disentanglement, reorientation of the relaxation rate vector may significantly increase the time of disentanglement.

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Section: Discussionmentioning

confidence: 99%

Lindblad Dynamics and Disentanglement in Multi-Mode Bosonic Systems

Kiselev

Ali

Rybin

2021

Entropy

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“…There are several methods that have been proposed for measuring and detecting coherence in quantum systems [15]. Several studies on the characterization and analysis of coherence have been proposed through the coherence measure and have garnered a lot of interest [23][24][25][26][27][28][29][30]. From another side, coherence is susceptible to noise from the environment since any actual system must interact with it.…”

Section: Introductionmentioning

confidence: 99%

Classical and quantum correlations between two qubits interacting with a field in thermal spin states

Algarni¹,

Abdel‐Khalek²,

Berrada³

2023

Laser Phys. Lett.

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In this manuscript, we introduce a quantum physical model consisting of two-atom system that interact with a quantized field initially prepared in the thermal spin states (TSSs). We study the effect of the main parameters of the model on the dynamical behavior atom–atom coherence, atoms-field entanglement, atom–atom entanglement and classical correlation. We show how the quantumness measures can be influenced by the spin number and thermal noise in the absence and presence of time-dependent coupling effect. We obtain that, despite the destructive influence of thermal noise, a considerable amount of coherence, entanglement and classical correlation still remain during the time evolution according the values of spin number. The results also show that the TSSs can offer the advantage of generating the maximal amount of coherence, entanglement and classical correlation during the dynamics.

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“…The loss of quantum features induced by the environments is considered as a fundamental obstacle to the construction of quantum information processors and the realization of ultrafast quantum computation. The study of decoherence and disentanglement dynamics of open quantum systems can help us further expand the understanding of the environmental effects on the dynamical evolution of the quantum systems and the real origins of the loss of quantum features and quantum-classical transition, which has potential applications in preserving quantum features against the environmental noise and in realizing quantum manipulation and control and quantum measurement [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Disentanglement Dynamics in Nonequilibrium Environments

Chen

Han

et al. 2022

Entropy

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We theoretically study the non-Markovian disentanglement dynamics of a two-qubit system coupled to nonequilibrium environments with nonstationary and non-Markovian random telegraph noise statistical properties. The reduced density matrix of the two-qubit system can be expressed as the Kraus representation in terms of the tensor products of the single qubit Kraus operators. We derive the relation between the entanglement and nonlocality of the two-qubit system which are both closely associated with the decoherence function. We identify the threshold values of the decoherence function to ensure the existences of the concurrence and nonlocal quantum correlations for an arbitrary evolution time when the two-qubit system is initially prepared in the composite Bell states and the Werner states, respectively. It is shown that the environmental nonequilibrium feature can suppress the disentanglement dynamics and reduce the entanglement revivals in non-Markovian dynamics regime. In addition, the environmental nonequilibrium feature can enhance the nonlocality of the two-qubit system. Moreover, the entanglement sudden death and rebirth phenomena and the transition between quantum and classical nonlocalities closely depend on the parameters of the initial states and the environmental parameters in nonequilibrium environments.

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

Cited by 24 publications

References 92 publications

Lindblad Dynamics and Disentanglement in Multi-Mode Bosonic Systems

Lindblad Dynamics and Disentanglement in Multi-Mode Bosonic Systems

Classical and quantum correlations between two qubits interacting with a field in thermal spin states

Disentanglement Dynamics in Nonequilibrium Environments

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