Interaction engineering for environmental probing

TL;DR

This paper investigates how environmental information can be extracted through measurements on one part of an interacting bipartite system, highlighting that entanglement is not essential for such probing, and establishing conditions for reliable information gathering.

Contribution

It demonstrates that entanglement is not necessary for environment characterization and identifies the importance of interaction between parties for effective probing.

Findings

Entanglement is not crucial for environment probing.

Interaction enables reliable information extraction.

Results apply to both discrete and continuous variables.

Abstract

We study the conditions for the probing of an environment affecting one party of a bipartite system of interacting objects by measurements operated only on the other element. We show that entanglement plays no crucial role in such an environment-characterization. On the other hand, if an interaction is established between the two parties, information can be reliably gathered. This result holds for both discrete and continuous variables and helps in the interpretation of recent experiments addressing the properties of mesoscopic objects.