Entanglement between two spatially separated ultracold interacting Fermi gases

TL;DR

This paper demonstrates that many-particle entanglement can be generated between two spatially separated ultracold interacting Fermi gases by splitting a Fermi gas in the BEC regime, leveraging fermion exchange symmetry.

Contribution

It introduces a novel method to generate entanglement in ultracold Fermi gases using an ansatz of composite bosons, expanding quantum entanglement applications beyond Bose-Einstein condensates.

Findings

Entanglement can be created between separated Fermi gases via splitting.

Fermion exchange symmetry underpins the entanglement mechanism.

Potential for Bell tests of quantum nonlocality in ultracold gases.

Abstract

Multiparticle entangled states, essential ingredients for modern quantum technologies, are routinely generated in experiments of atomic Bose-Einstein condensates (BECs). However, the entanglement in ultracold interacting Fermi gases has not been yet exploited. In this work, by using an ansatz of composite bosons, we show that many-particle entanglement between two fermionic ensembles localized in spatially separated modes can be generated by splitting an ultracold interacting Fermi gas in the (molecular) BEC regime. This entanglement relies on the fundamental fermion exchange symmetry of molecular constituents and might be used for implementing Bell test of quantum nonlocality in oncoming experiments.