Entanglement harvesting in the presence of a reflecting boundary

Liu, Zhihong; Zhang, Jialin; Yu, Hongwei

doi:10.1007/jhep08(2021)020

Cited by 32 publications

(21 citation statements)

References 54 publications

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“…Furthermore, the inertial case also had a comparatively larger harvesting-achievable separation range. Namely, there was no acceleration-assisted entanglement harvesting for detectors located sufficiently far from the boundary [30]. Similar results for circularly accelerated detectors -that harvested entanglement always degrades with increasing acceleration -were likewise found recently [22].…”

supporting

confidence: 70%

“…Once the Wightman function and the particular detectors' trajectories are given, the amount of entanglement harvested by the detectors from the fields can be obtained straightforwardly. Specifically, for two detectors at rest, the harvested entanglement (concurrence) can be analytically computed from (6) with the transition probability P D and the non-local correlation term X given as follows [30,31]…”

Section: A the General Modelmentioning

confidence: 99%

“…The transition probability for a uniformly accelerated detector can be derived by substituting trajectories ( 8) into ( 9) and then computing (3). After some algebraic manipulations, we arrive at [22,30]…”

Section: Parallel Accelerationmentioning

confidence: 99%

“…This model regards a detector as an idealized atom (or qubit) with two energy levels (ground and excited) separated by an energy gap Ω. Harvesting with this model has been examined in a wide variety of scenarios, where it has been shown to be sensitive to the intricate motion of detectors [22,26], the presence of boundaries [28][29][30], and the properties of spacetime including its dimension [27], topology [31], curvature [32][33][34][35][36],…”

mentioning

confidence: 99%

“…Entanglement harvesting by uniformly accelerated detectors in the presence of a reflecting boundary was recently studied [30], the focus being on the influence of the presence of a boundary, with the energy gap fixed to be small (relative to the duration parameter) for simplicity. Detectors at rest were found to be likely to harvest more entanglement than those experiencing acceleration in all scenarios within a certain fixed distance from the boundary.…”

mentioning

confidence: 99%

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Does acceleration assist entanglement harvesting?

Liu,

Zhang,

Mann

et al. 2021

Preprint

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We explore whether acceleration assists entanglement harvesting for a pair of uniformly accelerated detectors in three different acceleration scenarios, i.e., parallel, anti-parallel and mutually perpendicular acceleration, both in the sense of the entanglement harvested and harvesting-achievable separation between the two detectors. Within the framework of entanglement harvesting protocols and the Unruh-DeWitt model of detectors locally interacting with massless scalar fields via a Gaussian switching function with an interaction duration parameter, we find that, in the sense of the entanglement harvested, acceleration is a mixed blessing to the entanglement harvesting in the fact that it increases the harvested entanglement for a large detectors' energy gap relative to the interaction duration parameter while inhibits the entanglement harvesting for a small energy gap. Regarding the harvesting-achievable separation range between the detectors, we further find that for a very small acceleration and a large energy gap both relative to the duration parameter the acceleration-assisted enhancement could happen in all three acceleration scenarios, which is in sharp contrast to what was argued previously that the harvesting-achievable range can be enhanced only in the anti-parallel acceleration case. However, for a not too small acceleration relative to the duration parameter and an energy gap larger than the acceleration, we find that only the detectors in parallel acceleration possess a harvesting-achievable range larger than those at rest.

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supporting

confidence: 70%

Section: A the General Modelmentioning

confidence: 99%

Section: Parallel Accelerationmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Does acceleration assist entanglement harvesting?

Liu,

Zhang,

Mann

et al. 2021

Preprint

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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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Entanglement harvesting in cosmic string spacetime

Ji,

Zhang,

2024

J. High Energ. Phys.

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We investigate the entanglement harvesting phenomenon for static detectors that locally interact with massless scalar fields in the cosmic string spacetime, which, though locally flat, features a conical structure defined by a deficit angle. Specifically, we analyze three detector alignments relative to the string: parallel and orthogonal alignments with detectors on the same side of the string, and an orthogonal alignment with detectors on opposite sides of the string. For the alignments on the same side of the string, we observe that the cosmic string’s presence can either aid or hinder entanglement harvesting, affecting both the extent of entanglement harvested and the achievable range of interdetector separation. This effect depends on the distance between the detectors and the string and differs markedly from scenarios in a locally flat spacetime with a reflecting boundary, where the boundary invariably extends the harvesting-achievable range. Conversely, for the alignment with detectors on opposite sides of the string, we find that detectors consistently harvest more entanglement than those in a flat spacetime devoid of a cosmic string. This starkly contrasts the behavior observed with detectors on the same side. Interestingly, the presence of a cosmic string expands the harvesting-achievable range for detectors in orthogonal alignment only when near the string, whereas it invariably reduces the achievable range for detectors in parallel alignment.

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Entanglement harvesting in the presence of a reflecting boundary

Cited by 32 publications

References 54 publications

Does acceleration assist entanglement harvesting?

Does acceleration assist entanglement harvesting?

Harvesting entanglement by non-identical detectors with different energy gaps

Entanglement harvesting in cosmic string spacetime

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