Signatures of the collapse and revival of a spin Schr\"{o}dinger cat state in a continuously monitored field mode

TL;DR

This paper investigates how continuous measurement affects the collapse and revival of spin Schrödinger cat states in a Tavis-Cummings model, showing it is possible to observe these quantum phenomena without destroying them.

Contribution

It demonstrates that a balanced continuous measurement can preserve collapse and revival dynamics while enabling their detection in the measurement record.

Findings

Weak to moderate measurement preserves collapse and revival

Measurement provides enough signal-to-noise ratio for detection

Verification of spin Schrödinger cat states is feasible

Abstract

We study the effects of continuous measurement of the field mode during the collapse and revival of spin Schr\"{o}dinger cat states in the Tavis-Cummings model of N qubits (two-level quantum systems) coupled to a field mode. We show that a compromise between relatively weak and relatively strong continuous measurement will not completely destroy the collapse and revival dynamics while still providing enough signal-to-noise resolution to identify the signatures of the process in the measurement record. This type of measurement would in principle allow the verification of the occurrence of the collapse and revival of a spin Schr\"{o}dinger cat state.