Bose polarons as relativistic Unruh-DeWitt detectors: Entanglement harvesting from Bose-Einstein condensates

TL;DR

This paper demonstrates how Bose polarons can function as relativistic Unruh-DeWitt detectors to harvest entanglement from Bose-Einstein condensates, providing a bridge between condensed matter and relativistic quantum information.

Contribution

It introduces a novel mapping of impurities in BECs to relativistic detectors and proposes an experimental setup for entanglement harvesting.

Findings

Explicit experimental parameters for implementation with ${}^{39} ext{K}$ and ${}^{87} ext{Rb}$.

Viable conditions for entanglement harvesting from the condensate.

Mapping of impurity dynamics to relativistic quantum field interactions.

Abstract

We show that a bound impurity in a Bose-Einstein condensate can be directly mapped to an Unruh-DeWitt detector interacting with a relativistic quantum field. We provide explicit experimental parameters for an implementation using ${}^{39}\text{K}$ impurities coupled to a ${}^{87}\text{Rb}$ condensate via finite-time Feshbach tuning. As an application, we study the extraction of vacuum entanglement from distant regions of the condensate and find viable parameters for the implementation of entanglement harvesting.