Dynamic sensitivity of phton-dressed atomic ensenmble with quantum criticality

TL;DR

This paper investigates how a photon-dressed atomic ensemble near a quantum critical point exhibits heightened dynamic sensitivity, enabling detection of passing atoms through phase transition-induced changes in system dynamics.

Contribution

It demonstrates the use of the Dicke model's quantum criticality to enhance detection sensitivity via dynamic phase transition responses.

Findings

Quantum phase transition triggered by passing atom

Sudden change in Loschmidt echo dynamics

Enhanced detection sensitivity analogous to a cloud chamber

Abstract

We study the dynamic sensitivity of an atomic ensemble dressed by a single-mode cavity field (called a photon-dressed atomic ensemble), which is described by the Dicke model near the quantum critical point. It is shown that when an extra atom in a pure initial state passes through the cavity, the photon-dressed atomic ensemble will experience a quantum phase transition, showing an explicit sudden change in its dynamics characterized by the Loschmidt echo of this quantum critical system. With such dynamic sensitivity, the Dicke model can resemble to the cloud chamber for detecting a flying particle by the enhanced trajectory due to the classical phase transition.