Decoherence of quantum information in the non-Markovian qubit channel

Ban, Masashi; Kitajima, Sachiko; Shibata, Fumiaki

doi:10.1088/0305-4470/38/32/006

Cited by 37 publications

(19 citation statements)

References 28 publications

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“…As is known, this type of entangled states with suffers from entanglement sudden death when each atom locally interacts with a dissipative environment 7 8 9 . As far as non-Markovian environments are concerned, partial revivals of entanglement can occur 38 41 42 43 44 74 75 76 77 78 79 80 81 82 83 84 typically after asymptotically decaying to zero or after a finite dark period of complete disappearance. It would be useful in practical applications that the non-Markovian oscillations can occur when the entanglement still retain a relatively large value.…”

Section: Resultsmentioning

confidence: 99%

Cavity-based architecture to preserve quantum coherence and entanglement

Man

Xia

Franco

2015

Sci Rep

167

115

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Quantum technology relies on the utilization of resources, like quantum coherence and entanglement, which allow quantum information and computation processing. This achievement is however jeopardized by the detrimental effects of the environment surrounding any quantum system, so that finding strategies to protect quantum resources is essential. Non-Markovian and structured environments are useful tools to this aim. Here we show how a simple environmental architecture made of two coupled lossy cavities enables a switch between Markovian and non-Markovian regimes for the dynamics of a qubit embedded in one of the cavity. Furthermore, qubit coherence can be indefinitely preserved if the cavity without qubit is perfect. We then focus on entanglement control of two independent qubits locally subject to such an engineered environment and discuss its feasibility in the framework of circuit quantum electrodynamics. With up-to-date experimental parameters, we show that our architecture allows entanglement lifetimes orders of magnitude longer than the spontaneous lifetime without local cavity couplings. This cavity-based architecture is straightforwardly extendable to many qubits for scalability.

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Section: Resultsmentioning

confidence: 99%

Cavity-based architecture to preserve quantum coherence and entanglement

Man

Xia

Franco

2015

Sci Rep

167

115

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“…Using the expression of the concurrence for "X" states given in Eqs. (19) and (20), it is readily seen that C X ρ (t) for the EWL states of Eq. (13) is respectively…”

Section: B Concurrencementioning

confidence: 96%

Entanglement dynamics of two independent qubits in environments with and without memory

2008

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Here is analyzed the dynamics of two-qubit entanglement, when the two qubits are initially in a mixed extended Werner-like state and each of them is in a zero temperature non-Markovian environment. The dependence of entanglement dynamics on the purity and degree of entanglement of the initial states and on the amount of non-Markovianity is also given. This extends the previous work about non-Markovian effects on the two-qubit entanglement dynamics for initial Bell-like states [Bellomo et al., Phys. Rev. Lett. 99, 160502 (2007)]. The effect on the two-qubit entanglement dynamics of nonzero temperature in Markovian environments is finally studied

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“…It does not contribute to the Laplace transform of ∆ + β because the latter involves integration over the real axis of s. Thus, the correlation functions (24) for the accelerated qubit in vacuum and the static qubit in a thermal bath coincide for β = T −1 U . Consequently, our method describes non-Markovian processes for qubits coupled to a thermal field bath-see, for example, [31][32][33]. In particular, the results of Sec.…”

Section: Thermal Field Bathmentioning

confidence: 99%

Non-Markovian time evolution of an accelerated qubit

Moustos

Anastopoulos

2017

Phys. Rev. D

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We present a new method for evaluating the response of a moving qubit detector interacting with a scalar field in Minkowski spacetime. We treat the detector as an open quantum system, but we do not invoke the Markov approximation. The evolution equations for the qubit density matrix are valid at all times, for all qubit trajectories, and they incorporate non-Markovian effects.We analyze in detail the case of uniform acceleration, providing a detailed characterization of all regimes where non-Markovian effects are significant. We argue that the most stable characterization of acceleration temperature refers to the late time behavior of the detector because interaction with the field vacuum brings the qubit to a thermal state at the Unruh temperature. In contrast, the early-time transition rate, that is invoked in most discussions of acceleration temperature, does not exhibit a thermal behavior when non-Markovian effects are taken into account. Finally, we note that the non-Markovian evolution derived here also applies to the mathematically equivalent problem of a static qubit interacting with a thermal field bath. * Electronic address: dmoustos@upatras.gr † Electronic address: anastop@physics.upatras.gr

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Decoherence of quantum information in the non-Markovian qubit channel

Cited by 37 publications

References 28 publications

Cavity-based architecture to preserve quantum coherence and entanglement

Cavity-based architecture to preserve quantum coherence and entanglement

Entanglement dynamics of two independent qubits in environments with and without memory

Non-Markovian time evolution of an accelerated qubit

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