Creation of entangled atomic states by an analogue of the Dynamical Casimir Effect

TL;DR

This paper demonstrates the creation of entangled atomic states by simulating the Dynamical Casimir Effect in a spinor Bose-Einstein condensate, showing how changing boundary conditions can generate entangled excitations.

Contribution

It introduces a novel method to produce entangled atomic states through boundary condition modulation in a Bose-Einstein condensate, mimicking the Dynamical Casimir Effect.

Findings

Entangled pairs of excitations are generated in the condensate.

Continuous-variable entanglement is certified in the output state.

The method simulates the dynamical Casimir effect in atomic systems.

Abstract

If the boundary conditions of the quantum vacuum are changed in time, quantum field theory predicts that real, observable particles can be created in the initially empty modes. Here, we realize this effect by changing the boundary conditions of a spinor Bose-Einstein condensate, which yields a population of initially unoccupied spatial and spin excitations. We prove that the excitations are created as entangled excitation pairs by certifying continuous-variable entanglement within the many-particle output state.