Killing quantum entanglement by acceleration or a black hole

Dai, Yue; Shen, Zhejun; Shi, Yu

doi:10.1007/jhep09(2015)071

Cited by 26 publications

(15 citation statements)

References 42 publications

(55 reference statements)

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“…An interesting way for this is to see the change of quantum entanglement by acceleration. According to the previous results [22][23][24][25][26][27][28][29][30], the quantum entanglement would be degraded by the Unruh effect, which is similar to the results caused by the thermal background. However, a recent calculation showed that the anti-Unruh effect can lead to the increase for the quantum entanglement for the bipartite [31] and many-body quantum states [32].…”

Section: Introductionsupporting

confidence: 80%

Anti-Unruh effect in the thermal background

Pan,

Zhang

2021

Preprint

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We study the influence of the thermal background on the existence of the anti-Unruh effect. For the massless scalar field, we present that the anti-Unruh effect can appear when the detector is accelerated in the thermal field, which is shown to be absent when accelerating in the Minkowski vacuum. For the massive scalar field, it is found that the anti-Unruh effect which exists in the case for accelerated detectors in the vacuum can disappear when the background temperature increases. We use the many-body entangled quantum state to study the situation of the massive scalar field. When the many-body state is accelerated, its entanglement is decreasing with the increase of the background temperature and the phenomenon of the sudden death for entanglement occurs. This provides a valuable indication that the anti-Unruh effect can exist below some specific background temperature, dependent on the actual experimental environment.

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Section: Introductionsupporting

confidence: 80%

Anti-Unruh effect in the thermal background

Pan,

Zhang

2021

Preprint

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“…Experiments have shown [3] that when the height of atomic clocks changes to 33 cm, the gravity frequency shift effect has a significant effect on the accuracy of atomic clocks. Furthermore, many theoretical researchers have considered the dynamical behaviors of the system in the context of relativity [4][5][6][7][8][9][10]. In particular, the Hawking effect, i.e., the particle creation process that gives rise to a thermal spectrum of radiation outgoing from a black hole, has a significant effect on the quantum entanglement [11,12], quantum discord [13] and some other information quantities [14].…”

Section: Introductionmentioning

confidence: 99%

Quantum speedup dynamics process in Schwarzschild space-time

Xu¹,

Zhu²,

Wang³

et al. 2021

Preprint

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Quantum speed limit time (QSLT) can be used to characterize the intrinsic minimal time interval for a quantum system evolving from an initial state to a target state. We investigate the QSLT of the open system in Schwarzschild space-time. We show that, in some typical noisy channels, the Hawking effect can be beneficial to the evolution of the system. For an initial entangled state, the evolution speed of the system can be enhanced in the depolarizing, bit flip, and bit-phase flip channels as the Hawking temperature increases, which are in sharp contrast to the phase flip channel. Moreover, the optimal initial entanglement exists in other noise channels except the phase flip channel, which minimizes the QSLT of the system and thus leads to the maximum evolution speed of the system.

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“…Entanglement between Unruh-Wald detectors of boson fields have also been studied and it was found that when one or more detectors accelerate, entanglement quickly degrades, and suddenly dies at finite values of the accelerations [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Quantum teleportation in terms of Dirac modes between accelerated observers

Dai¹,

Shi

2019

Preprint

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We have studied entanglement between two Dirac modes respectively observed by two independently accelerated observers. Due to Unruh effect, the entanglement degrades, but residual nonzero entanglement remains even when the accelerations of both observers are infinite. We have also investigated quantum teleportation using entangled Dirac modes, and calculated the fidelities in various cases. In general, the fidelity depends on the single-qubit state γ|0 + δ|1 to be teleported, as well as which Bell state to use. In the limit that both accelerations are infinite, the average fidelity in using |φ ± ≡ 1 2 (|00 ± |11 ) is 3 4 , while that in using |ψ ± ≡ 1 2 (|01 ± |10 ) is

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Killing quantum entanglement by acceleration or a black hole

Cited by 26 publications

References 42 publications

Anti-Unruh effect in the thermal background

Anti-Unruh effect in the thermal background

Quantum speedup dynamics process in Schwarzschild space-time

Quantum teleportation in terms of Dirac modes between accelerated observers

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