Disentanglement and decoherence from classical non-Markovian noise: random telegraph noise

Zhou, Dong; Lang, Alex H.; Joynt, Robert

doi:10.1007/s11128-010-0165-2

Cited by 65 publications

(59 citation statements)

References 61 publications

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“…This model has in common with the one considered in Ref. [19] that the environments are unaffected by the system of interest. However, here the element of randomness is introduced in the phase which can assume only two possible values with assigned and fixed probabilities without switching between them.…”

Section: Modelmentioning

confidence: 99%

“…In Ref. [19] qubits are subject to random telegraph noise, where instead it is the coupling that switches between two values during the evolution.…”

Section: Modelmentioning

confidence: 99%

“…Similarly, if the environment has no back-action on the system, then it would seem that this could also affect the correlation dynamics. Nevertheless, revivals of quantum correlations can occur for random classical telegraph noise [19]. It is clearly important to know exactly what kinds of behavior of correlation dynamics can be described when an environment is modeled as classical instead of quantum, or when back-action on the system is not present.…”

Section: Introductionmentioning

confidence: 99%

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Revival of quantum correlations without system-environment back-action

Franco

Bellomo²,

Andersson³

et al. 2012

Phys. Rev. A

185

201

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Revivals of quantum correlations have often been explained in terms of back-action on quantum systems by their quantum environment(s). Here we consider a system of two independently evolving qubits, each locally interacting with a classical random external field. The environments of the qubits are also independent, and there is no back-action on the qubits. Nevertheless, entanglement, quantum discord, and classical correlations between the two qubits may revive in this model. We explain the revivals in terms of correlations in a classical-quantum state of the environments and the qubits. Although classical states cannot store entanglement on their own, they can play a role in storing and reviving entanglement. It is important to know how the absence of back-action, or modeling an environment as classical, affects the kind of system time evolutions one is able to describe. We find a class of global time evolutions where back-action is absent and for which there is no loss of generality in modeling the environment as classical. Finally, we show that the revivals can be connected with the increase of a parameter used to quantify non-Markovianity of the single-qubit dynamics.

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Section: Modelmentioning

confidence: 99%

“…In Ref. [19] qubits are subject to random telegraph noise, where instead it is the coupling that switches between two values during the evolution.…”

Section: Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Revival of quantum correlations without system-environment back-action

Franco

Bellomo²,

Andersson³

et al. 2012

Phys. Rev. A

185

201

View full text Add to dashboard Cite

show abstract

“…It is worth to notice that the evolved state ρ(t) belongs to the Hilbert space spanned by the Bell states |φ ± = 1 √ 2 (|00 ± |11 ), therefore the entanglement of formation equals the entanglement cost [28]. In the strong coupling regime, g = v/γ > 1 [21,23] entanglement revivals occur during the system dynamics [9,13].…”

Section: Entanglement Dynamicsmentioning

confidence: 99%

“…In some cases, this phenomenon is due to the fact that entanglement is transferred to quantum environments, and then back-transferred to the system [7,8]. In other cases, the environment can be modelled as a classical system [9,11,13] and no entanglement between the system and the environment is established at any time. In the latter cases, the occurrence of entanglement revivals may appear paradoxical, since the effect of the noise is analogous to a local operation on a subsystem.…”

Section: Introductionmentioning

confidence: 99%

Hidden entanglement in the presence of random telegraph dephasing noise

et al. 2013

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Abstract. Entanglement dynamics of two noninteracting qubits, locally affected by random telegraph noise at pure dephasing, exhibits revivals. These revivals are not due to the action of any nonlocal operation, thus their occurrence may appear paradoxical since entanglement is by definition a nonlocal resource. We show that a simple explanation of this phenomenon may be provided by using the (recently introduced) concept of hidden entanglement, which signals the presence of entanglement that may be recovered with the only help of local operations.

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Overview on the Phenomenon of Two-Qubit Entanglement Revivals in Classical Environments

Franco

2017

Quantum Science and Technology

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The occurrence of revivals of quantum entanglement between separated open quantum systems has been shown not only for dissipative non-Markovian quantum environments but also for classical environments in absence of back-action. While the phenomenon is well understood in the first case, the possibility to retrieve entanglement when the composite quantum system is subject to local classical noise has generated a debate regarding its interpretation. This dynamical property of open quantum systems assumes an important role in quantum information theory from both fundamental and practical perspectives. Hybrid quantum-classical systems are in fact promising candidates to investigate the interplay among quantum and classical features and to look for possible control strategies of a quantum system by means of a classical device. Here we present an overview on this topic, reporting the most recent theoretical and experimental results about the revivals of entanglement between two qubits locally interacting with classical environments. We also review and discuss the interpretations provided so far to explain this phenomenon, suggesting that they can be cast under a unified viewpoint. * Electronic address: rosario.lofranco@unipa.it arXiv:1608.05970v1 [quant-ph]

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Disentanglement and decoherence from classical non-Markovian noise: random telegraph noise

Cited by 65 publications

References 61 publications

Revival of quantum correlations without system-environment back-action

Revival of quantum correlations without system-environment back-action

Hidden entanglement in the presence of random telegraph dephasing noise

Overview on the Phenomenon of Two-Qubit Entanglement Revivals in Classical Environments

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