Multipartite Entangled Spatial Modes of Ultracold Atoms Generated and Controlled by Quantum Measurement

TL;DR

This paper demonstrates how measurement back-action can generate and control multipartite spatial modes and entanglement in ultracold atoms in optical lattices, enabling quantum state engineering and entanglement detection.

Contribution

It introduces a method to generate and manipulate multipartite spatial modes and entanglement in ultracold atoms via measurement back-action in a single setup.

Findings

Generation of multiple many-body spatial modes through measurement back-action.

Tunable entanglement properties and spatial overlaps of modes.

Examples of multimode states and their transformation into squeezed states.

Abstract

We show that the effect of measurement back-action results in the generation of multiple many-body spatial modes of ultracold atoms trapped in an optical lattice, when scattered light is detected. The multipartite mode entanglement properties and their nontrivial spatial overlap can be varied by tuning the optical geometry in a single setup. This can be used to engineer quantum states and dynamics of matter fields. We provide examples of multimode generalizations of parametric down-conversion, Dicke, and other states, investigate the entanglement properties of such states, and show how they can be transformed into a class of generalized squeezed states. Further, we propose how these modes can be used to detect and measure entanglement in quantum gases.