Coherence between acoustically induced spectral sidebands

Determine the coherence properties between distinct spectral sidebands in the resonance fluorescence spectrum of an acoustically modulated quantum dot.

Background

An acoustically modulated quantum dot emits resonance fluorescence comprising a central line and acoustically induced sidebands. Although the sideband frequencies and single-photon character can be controlled, establishing a fixed phase relationship between different sidebands is necessary for coherent frequency-bin superpositions and quantum-information applications.

The paper identifies the mutual coherence of distinct spectral sidebands as unresolved and develops a filtered-field Mach–Zehnder interferometric framework intended to diagnose that coherence through the geometric slant of two-dimensional interferograms. The stated problem is included because the precise impact of environmental dephasing on mutual sideband coherence had not been established.