Multicolor nonlinear chiral quantum optics: beyond phase

Abstract:Chiral quantum nonlinearities that arise when light interacts with quantum emitters are known to modulate only the phase but not the amplitude of scattered photons, enabling the creation of non-reciprocal photonic elements, quantum logic gates, and quantum network protocols. In this work, we show that the addition of a second photon beam drastically changes this picture, enabling both phase and amplitude modulation. Surprisingly, coherent photon transfer between the different beams enables a stronger amplitude modulation than standard symmetric interactions. This is most obvious in the coherent, three-photon amplification, which we predict peaks with a 30% efficiency in a chiral geometry, 3x the efficiency of the symmetric configuration. Our results uncover a new regime of chiral quantum optics and provide a route towards more efficient all-optical control at few-photon energies.

arXiv:2608.14807 [quant-ph]

(or arXiv:2608.14807v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2608.14807 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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