Conditional squeezing induced by a two-level system: a first-principles approach to QND readout

TL;DR

This paper develops a first-principles approach using Magnus expansion to analyze light-matter interactions, revealing how conditional squeezing and energy shifts enable quantum nondemolition measurements of squeezed light.

Contribution

It introduces a systematic Magnus expansion method to derive conditional squeezing effects from the Jaynes-Cummings model, clarifying their algebraic structure and measurement implications.

Findings

Second-order Magnus expansion reveals energy shifts and squeezing.

Conditional squeezing depends on the atomic state.

SU(1,1) algebra ensures unitary evolution.

Abstract

We present a systematic Magnus expansion treatment of light-matter interaction beyond the Rotating Wave Approximation. We show that at the second order of Magnus series, the time-evolution operator acquires both energy-shifts and squeezing contributions. In addition to the energy shifts caused by vacuum and photon numbers, the second-order evolution operator contains a term that induces conditional squeezing of the field mode depending on the state of the atom. Such a term suggests a natural mechanism for phase-sensitive, quantum non-demolishing type measurements of squeezed light via homodyne detection. We also show that the second-order Magnus operator in a close SU(1,1) algebra, ensuring the exponentiation of the Magnus series yields a well-defined unitary evolution. By deriving squeezing directly from the Jaynes-Cummings Hamiltonian, our results clarify how energy shifts and $\hat{\sigma}$-dependent squeezing arise from an SU(1,1) structure, with direct implications for phase-sensitive and quantum nondemolition measurements.