Squeezing and entanglement of density oscillations in a Bose-Einstein condensate

TL;DR

This paper explores how nondestructive optical measurements can induce squeezing and entanglement in density oscillations of a Bose-Einstein condensate, enabling mode-selective control through stroboscopic imaging and feedback.

Contribution

It demonstrates a method to generate and control quantum correlations in BEC density modes via measurement back action and feedback.

Findings

Measurement back action induces squeezing and entanglement.

Stroboscopic imaging allows mode-selective addressing.

Feedback can suppress unwanted excitations.

Abstract

The dispersive interaction of atoms and a far-detuned light field allows nondestructive imaging of the density oscillations in Bose-Einstein condensates. Starting from a ground state condensate, we investigate how the measurement back action leads to squeezing and entanglement of the quantized density oscillations. In particular, we show that properly timed, stroboscopic imaging and feedback can be used to selectively address specific eigenmodes and avoid excitation of non-targeted modes of the system.