Controllable manipulation and detection of local densities and bipartite entanglement in a quantum gas by a dissipative defect

TL;DR

This paper investigates how a localized dissipative defect in a one-dimensional Bose gas can be used to control local densities and generate entanglement, revealing complex dynamics and measurement techniques.

Contribution

It introduces methods to measure and manipulate local densities and entanglement in a quantum gas using a dissipative defect, highlighting controlled entanglement generation despite dissipation.

Findings

Dissipative defects can induce local density control.

Entanglement can be generated through defect-induced dynamics.

Interplay between hole excitations and wave function collapse is crucial.

Abstract

We study the complex dynamics of a one-dimensional Bose gas subjected to a dissipative local defect which induces one-body atom losses. In experiments these atom losses occur, for example, when a focused electron or light beam or a single trapped ion is brought into contact with a quantum gas. We discuss how within such setups one can measure or manipulate densities locally and specify the excitations that are induced by the defect. In certain situations the defect can be used to generate entanglement in a controlled way despite its dissipative nature. The careful examination of the interplay between hole excitations and the collapse of the wave function due to nondetection of loss is crucial for the understanding of the dynamics we observe.