Emergence of classicality in small number entangled systems

TL;DR

This paper investigates how classical behavior emerges from small entangled quantum systems by simulating the transition from fully quantum to semiclassical interactions, highlighting the roles of dissipation and external driving.

Contribution

It introduces a simulation of microwave Ramsey zones in Rydberg atom interferometry to bridge quantum and semiclassical dynamics in small entangled systems.

Findings

Demonstrates the transition from quantum to semiclassical behavior.

Shows how information flow and photon leakage relate to entanglement.

Highlights the impact of dissipation and external driving on coherence.

Abstract

We show the transition from a fully quantized interaction to a semiclassical one in entangled small number quantum systems using the quantum trajectories approach. In particular, we simulate the microwave Ramsey zones used in Rydberg atom interferometry, filling in the gap between the strongly entangling Jaynes Cummings evolution and the semiclassical rotation of the atomic internal states. We also correlate the information flowing with leaking photons to the entanglement generation between cavity field and flying atom and detail the roles played by the strong dissipation and the external driving force in preserving atomic coherence through the interaction.