Noise-induced finite-time disentanglement in two-atomic system

Jakóbczyk, Lech; Jamróz, Anna

doi:10.1016/j.physleta.2004.10.024

Cited by 64 publications

(86 citation statements)

References 19 publications

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“…Recently, it has been found that although local decoherence processes take an infinite time, two atoms may get completely disentangled within a finite time. This phenomenon, named entanglement sudden death [2,3], has attracted broad attention [2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Entanglement dynamics for uniformly accelerated two-level atoms

2015

Phys. Rev. A

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We study, in the paradigm of open quantum systems, the entanglement dynamics of two uniformly accelerated atoms with the same acceleration perpendicular to the separation. The two-atom system is treated as an open system coupled with a bath of fluctuating massless scalar fields in the Minkowski vacuum, and the master equation that governs its evolution is derived. It has been found that, for accelerated atoms with a nonvanishing separation, entanglement sudden death is a general feature when the initial state is entangled, while for those in a separable initial state, entanglement sudden birth only happens for atoms with an appropriate interatomic separation and sufficiently small acceleration. Remarkably, accelerated atoms can get entangled in certain circumstances while the inertial ones in the Minkowski vacuum cannot. A comparison between the results of accelerated atoms and those of static ones in a thermal bath shows that uniformly accelerated atoms exhibit features distinct from those immersed in a thermal bath at the Unruh temperature in terms of entanglement dynamics.

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Section: Introductionmentioning

confidence: 99%

Entanglement dynamics for uniformly accelerated two-level atoms

2015

Phys. Rev. A

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“…Clearly, such finite-time disentanglement can seriously affect applications of entangled states in quantum information processing. The initial report of ESD in two-qubit entangled states in a specific model was later explored in wider contexts and in higher dimensions of Hilbert space when the qubits are replaced by qutrits or qudits [4,5,6,7,8,9,10,11]. The experimental evidences for this effect have been reported for optical setups [12] and atomic ensembles [13].…”

Section: Introductionmentioning

confidence: 99%

Distillability sudden death in qutrit-qutrit systems under global and multilocal dephasing

Ali

2010

Phys. Rev. A

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Recently Song et al., Phys. Rev. A 80, 012331 (2009), have discovered that certain two-qutrit entangled states interacting with multi-local decoherence undergo distillability sudden death whereas their locally equivalent states do not exhibit such behavior. We have found that their basic equation of motion missed some terms and therefore the subsequent calculations and conclusions are not correct/valid except that distillability sudden death may occur. We provide the missing terms and point out the corrections which must be done in the literature to remove confusion. Moreover, we have studied this feature for certain entangled states under global, collective and multi-local decoherence. We have found that entanglement sudden death and distillability sudden death may happen under global and multi-local noises. Moreover, local unitary transformations can not avoid distillability sudden death.

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“…This behaviour should be compared with asymptotic decoherence of any initial state. On the other hand, individual atoms located inside two independent environments at infinite temperatures, always disentangle at finite times [5].…”

Section: Introductionmentioning

confidence: 99%