Optimization of entanglement harvesting depends on the extremality and nonextremality of a black hole

Barman, Subhajit; Majhi, Bibhas Ranjan

doi:10.48550/arxiv.2301.06764

Cited by 1 publication

(1 citation statement)

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“…In entanglement harvesting, one usually considers two such Unruh-DeWitt detectors that are initially uncorrelated and then investigates the condition for these two detectors to get entangled over time. This detector entanglement depends on various scenarios, like due to the motion of the detectors [1,2,8,[21][22][23][24][25], background spacetime geometry [3,7,15,[26][27][28][29][30][31][32][33][34][35][36][37], presence of a thermal bath [38][39][40] to name a few among a plethora of other possibilities [41][42][43][44][45][46]. The experimental prospects of entanglement harvesting have been proposed in atomic physics [47], with superconducting qubits [48], between forward and past light cones [49].…”

Section: Jhep09(2023)180mentioning

confidence: 99%

Entanglement harvesting for different gravitational wave burst profiles with and without memory

Barman,

Chakraborty,

Mukherjee

2023

J. High Energ. Phys.

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In the present article, we study how different gravitational wave (GW) burst profiles in linearized gravity, with and without the asymptotic memory, may influence the harvesting between two static Unruh-DeWitt detectors. To this end, we investigate the following burst profiles — Gaussian, sech-squared, Heaviside step function, and tanh. Out of these, the first two bursts contain no memory, while the latter two consist of a non-vanishing memory effect. We find that in all of these cases, entanglement harvesting is possible, and it decreases with the increasing distance between detectors and the detector transition energy. We observe that the harvesting differs qualitatively based on the presence or absence of the memory, which is prominent in a low transition energy regime. With memory, the harvesting keeps increasing with decreasing transition energy, while without memory, it tends to reach finite values. Furthermore, for the two burst profiles without memory, longer bursts correspond to greater harvesting in the low detector transition energy regime, and this characteristic is reversed for larger transition energy. Meanwhile, for the tanh-type profile with memory, harvesting is always greater for shorter bursts. We discuss various implications of our findings.

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