Quantum-fluctuation asymmetry in multiphoton Jaynes-Cummings resonances

TL;DR

This paper investigates the quantum fluctuation asymmetry in multiphoton Jaynes-Cummings resonances, revealing how different measurement strategies influence the temporal and statistical properties of emitted light.

Contribution

It introduces an analytical expression for the intensity cross-correlation function at the two-photon resonance and explores the impact of measurement choices on quantum fluctuation asymmetry.

Findings

Breakdown of detailed balance at the two-photon resonance

Monitoring different quadratures affects photon waiting times

Measurement strategies influence emission channel ratios

Abstract

We explore the statistical behavior of the light emanating from a coherently driven Jaynes-Cummings (JC) oscillator operating in the regime of multiphoton blockade with two monitored output channels causing the loss of coherence at equal rates. We do so by adopting an operational approach which draws the particle and wave aspects of the forwards scattered radiation together, building upon the relationship between quantum optical correlation functions and conditional measurements. We first derive an analytical expression of the intensity cross-correlation function at the peak of the two-photon JC resonance to demonstrate the breakdown of detailed balance. The application of quantum trajectory theory in parallel with the quantum regression formula subsequently uncovers various aspects of temporal asymmetry in the quantum fluctuations characterizing the cascaded process through which a multiphoton resonance is established and read out. We find that monitoring different quadratures of the cavity field in conditional homodyne detection affects the times waited between successive photon counter ``clicks'', which in turn trigger the sampling of the homodyne current. Despite the fact that the steady-state cavity occupation is of the order of a photon, monitoring of the developing bimodality also impacts on the ratio between the emissions directed along the two decoherence channels.