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Updated: May 4, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Analytic properties of two-photon scattering matrix in integrated quantum systems determined by the cluster
Shanshan Xu1, Eden Rephaeli2, Shanhui Fan3
1Department of Physics, Stanford University, Stanford, California 94305, USA.
Abstract:
We consider a general class of integrated quantum systems where photon-photon interaction occurs in a quantum device that is localized in space. Using techniques that are closely related to cluster decomposition principles in quantum field theory, we provide a general constraint on the analytic properties of a two-photon S matrix in this class of systems. We also show that the photon-photon interaction in these systems inevitably leads to frequency mixing and entanglement and that frequencies of the single photons cannot be preserved in these systems.
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