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Two distinguishable impurities in BEC: squeezing and entanglement of two Bose polarons

Christos Charalambous, Miguel A. Garcia-March, Aniello Lampo, Mohammad Mehboud, Maciej Lewenstein

SciPost Phys. 6, 010 (2019) · published 22 January 2019


We study entanglement and squeezing of two uncoupled impurities immersed in a Bose-Einstein condensate. We treat them as two quantum Brownian particles interacting with a bath composed of the Bogoliubov modes of the condensate. The Langevin-like quantum stochastic equations derived exhibit memory effects. We study two scenarios: (i) In the absence of an external potential, we observe sudden death of entanglement; (ii) In the presence of an external harmonic potential, entanglement survives even at the asymptotic time limit. Our study considers experimentally tunable parameters.

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