Does acceleration assist entanglement harvesting?

Liu, Zhihong; Zhang, Jialin; Mann, Robert B.; Yu, Hongwei

doi:10.1103/physrevd.105.085012

Cited by 29 publications

(17 citation statements)

References 44 publications

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“…This is an interesting phenomenon, which is the main result for the Unruh and anti-Unruh effects in this paper. In addition, we have seen the acceleration can either enhance or degrade harvested entanglement, although this effect of acceleration has been shown in two detector systems previously, the possible relevance of the anti-Unruh effect was not considered [34][35][36].…”

Section: Conclusion and Discussionmentioning

confidence: 69%

“…Contrary to previous view, we show both the Unruh effect and anti-Unruh effect can enhance or decrease the entanglement between arbitrary numbers of detectors. It has been shown previously that acceleration can either enhance or degrade the harvested entanglement that can be harvested in a two-detector system from the vacuum state in an Unruh-DeWitt detector's model [34][35][36]. However, here we will consider an initially entangled state in our model.…”

Section: Introductionmentioning

confidence: 99%

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Genuine multipartite entanglement subject to the Unruh and anti-Unruh effects

Zeng

Liu

2022

New J. Phys.

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We study the acceleration effect on the genuine tripartite entanglement for one or two accelerated detector(s) coupled to the vacuum field. Surprisingly, we find that the increase and decrease in entanglement have no definite correspondence with the Unruh and anti-Unruh effects. Specifically, Unruh effect can not only decrease but also enhance the tripartite entanglement between detectors; also, anti-Unruh effect can not only enhance but also decrease the tripartite entanglement. We give an explanation of this phenomenon. Finally, we extend the discussion from tripartite to N-partite systems.

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Section: Conclusion and Discussionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Genuine multipartite entanglement subject to the Unruh and anti-Unruh effects

Zeng

Liu

2022

New J. Phys.

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“…However, this turns out to be not necessarily true; even a carefully switched detector with an infinite interaction duration experiences "cool down" as temperature increases. More precisely, writing F(Ω) = L DD / λ2 , the conditions dF(Ω) dT KMS < 0 weak (24) ∂T EDR ∂T KMS < 0 strong (25) in the presence of a black hole are respectively referred to as the weak and strong anti-Hawking effects [38] (see also [27,39,40,44]), where…”

Section: Resultsmentioning

confidence: 99%

“…A single detector can exhibit the anti-Unruh effect when accelerating, but not if it is inertial in a thermal bath [46]. In the context of entanglement harvesting, detectors accelerating in a vacuum state and inertial in a thermal state can be distinguished [23,25]. It would be interesting to compare mutual information in scenarios with and without acceleration in the same spacetime.…”

Section: Discussionmentioning

confidence: 99%

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Harvesting mutual information from BTZ black hole spacetime

Bueley,

Huang,

Gallock-Yoshimura

et al. 2022

Preprint

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We investigate the correlation harvesting protocol for mutual information between two Unruh-DeWitt detectors in a static BTZ black hole spacetime. Here, the effects coming from communication and change in proper separation of the detectors are set to be negligible so that only a black hole affects the extracted mutual information. We find that, unlike the entanglement harvesting scenario, harvested mutual information is zero only when a detector reaches an event horizon, and that although the Hawking effect and gravitational redshift both affect the extraction of mutual information, it is extreme Hawking radiation that inhibits the detectors from harvesting.

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Harvesting entanglement by non-identical detectors with different energy gaps

Hu¹,

Zhang²,

Yu³

2022

J. High Energ. Phys.

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It has been shown that the vacuum state of a free quantum field is entangled and such vacuum entanglement can be harvested by a pair of initially uncorrelated detectors interacting locally with the vacuum field for a finite time. In this paper, we examine the entanglement harvesting phenomenon of two non-identical inertial detectors with different energy gaps locally interacting with massless scalar fields via a Gaussian switching function. We focus on how entanglement harvesting depends on the energy gap difference from two perspectives: the amount of entanglement harvested and the harvesting-achievable separation between the two detectors. In the sense of the amount of entanglement, we find that as long as the inter-detector separation is not too small with respect to the interaction duration parameter, two non-identical detectors could extract more entanglement from the vacuum state than the identical detectors. There exists an optimal value of the energy gap difference when the inter-detector separation is sufficiently large that renders the harvested entanglement to peak. Regarding the harvesting-achievable separation, we further find that the presence of an energy gap difference generally enlarges the harvesting-achievable separation range. Our results suggest that the non-identical detectors may be advantageous to extracting entanglement from vacuum in certain circumstances as compared to identical detectors.

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Does acceleration assist entanglement harvesting?

Cited by 29 publications

References 44 publications

Genuine multipartite entanglement subject to the Unruh and anti-Unruh effects

Genuine multipartite entanglement subject to the Unruh and anti-Unruh effects

Harvesting mutual information from BTZ black hole spacetime

Harvesting entanglement by non-identical detectors with different energy gaps

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