2021-05-17

UTAPwiki/セミナー/初期宇宙・相対論速報

Title: Entanglement harvesting from vacuum in cosmology †

Speaker: Takumi Hayashi †

Abstract:
Entanglement is a characteristic notion of quantum physics and important physical resources which can be used for quantum computation, quantum teleportation, and so on. Recently, the entanglement acquisition process in which an unentangled pair of cubits become entangled by the Unruh-Dewitt detector interaction with the vacuum of quantum field, called “entanglement harvesting”, has been well studied. In this talk, I review the entanglement harvesting process in various situations, including Minkowski spacetime and cosmological backgrounds. And I also introduce the case with cubits uniformly accelerated, which can induce the nontrivial resonant production of entanglement. I briefly mention recent works as well regarding this topic.

References:
[1] Martin-Martinez, Eduardo and Menicucci, Nicolas C., Class. Quantum Grav. 31, 214001 (2014),[arXiv:quant-ph/1408.3420], “Entanglement in curved spacetimes and cosmology”
[2] Reznik, B.; Retzker, A.; Silman, J., Phys. Rev. A 2005, 71, 042104, [arXiv:quant-ph/0310058], “Violating Bell’s inequalities in vacuum”.
[3] Steeg, G.V.; Menicucci, N.C., Phys. Rev. D 2009, 79, 044027, [arXiv:quant-ph0711.3066], “Entangling power of an expanding universe”.
[4] G. Salton, R. B. Mann, and N. C. Menicucci, New J. Phys. 17, 035001 (2015), [arxiv:quant-ph/1408.1395v2], “Acceleration-assisted entanglement harvesting and rangefinding”.