Multicolor nonlinear chiral quantum optics: beyond phase

• URL: http://arxiv.org/abs/2608.14807v1
• Date: Fri, 14 Aug 2026 18:22:09 GMT
• Title: Multicolor nonlinear chiral quantum optics: beyond phase
• Abstract summary: We show that the addition of a second photon beam drastically changes this picture, enabling both phase and amplitude modulation.<n>Surprisingly, coherent photon transfer between the different beams enables a stronger amplitude modulation than standard symmetric interactions.<n>Our results uncover a new regime of chiral quantum optics and provide a route towards more efficient all-optical control at few-photon energies.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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