Order-Invariant Two-Photon Quantum Correlations in PT-Symmetric Interferometers

Multiphoton correlations in linear photonic quantum networks are governed by matrix permanents. Yet, surprisingly few systematic properties of these crucial algebraic objects are known. As such, predicting the overall multiphoton behavior of a network from its individual building blocks typically defies intuition. In this work, we identify sequences of concatenated two-mode linear optical transformations whose two-photon behavior is invariant under reversal of the order. We experimentally verify this systematic behavior in parity-time-symmetric complex interferometer arrangements of varying compositions. Our results underline new ways in which quantum correlations may be preserved in counterintuitive ways, even in small-scale non-Hermitian networks.

Automated summary

This research experimentally verifies the invariant behavior of two-photon behavior under the reversal of order for concatenated two-mode linear optical transformations in photonic quantum networks. The results indicate new ways in which quantum correlations may be preserved in counterintuitive ways, even in small-scale non-Hermitian networks.