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Nonreciprocity in Photon Pair Correlations
preprintposted on 2023-01-12, 13:37 authored by Austin Graf, Steven D. Rogers, Jeremy Staffa, Usman A. Javid, Dana H. Griffith, Qiang Lin
Nonreciprocal optical systems have found many applications altering the linear transmission of light as a function of its propagation direction. Here we consider a new class of nonreciprocity which appears in photon pair correlations and not in linear transmission. We experimentally demonstrate and theoretically verify this nonreciprocity in the second-order coherence functions of photon pairs produced by spontaneous four-wave mixing in a silicon microdisk. Reversal of the pump propagation direction can result in substantial extinction of the coherence functions without altering pump transmission.