Fano Interference in Two-Photon Transport
Shanshan Xu, Shanhui Fan
TL;DR
This paper develops a formalism to analyze two-photon transport in waveguides coupled to a cavity, revealing how Fano interference causes asymmetric spectral features in two-photon correlations, but not in fluorescence spectra.
Contribution
It introduces a general input-output formalism for multi-channel photon transport and demonstrates the manifestation of Fano interference in two-photon correlation functions.
Findings
Fano interference causes asymmetric spectral line shapes in two-photon correlations.
Two-photon fluorescence spectra do not show Fano interference effects.
The formalism can be applied to analyze quantum transport phenomena in waveguide-cavity systems.
Abstract
We present a general input-output formalism for the few-photon transport in multiple waveguide channels coupled to a local cavity. Using this formalism, we study the effect of Fano interference in two-photon quantum transport. We show that the physics of Fano interference can manifest as an asymmetric spectral line shape in the frequency dependence of the two-photon correlation function. The two-photon fluorescence spectrum, on the other hand, does not exhibit the physics of Fano interference.
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