Enhancing Photon Indistinguishability of Spectrally Mismatched Single Photons by Cavity Floquet Engineering

TL;DR

This paper proposes a theoretical scheme using Floquet-engineered optical frequency combs to significantly improve the indistinguishability of spectrally mismatched single photons in cavity QED systems, enabling high-quality quantum interference.

Contribution

It introduces a novel Floquet engineering approach to enhance photon indistinguishability by creating frequency comb states that coherently superpose mismatched photons, a concept not previously explored.

Findings

Achieves near-zero $g^{(2)}_\mathrm{HOM}(0)$ indicating high indistinguishability

Demonstrates energy-conserving preparation of frequency-comb states

Provides a theoretical foundation for improving quantum photonic interference

Abstract

We theoretically propose a scheme to enhance the photon indistinguishability of spectrally mismatched single photons via Floquet-engineered optical frequency combs (OFCs) in cavity quantum electrodynamic systems. By periodically modulating two distinct single-photon states under a modulation frequency which is exactly equal to the spectral mismatch of two cavity modes, a pair of single-photon frequency-comb (SPFC) states is prepared energy-conservatively based on full unitary operations. The two states show high indistinguishability with an ideal $g^{(2)}_\mathrm{HOM}(0)$ down to zero due to the superposition of intensity-matched single-photon states coherently distributed across the teeth of the combs.