One-sided destructive quantum interference from an exceptional-point-based metasurface

We propose the concept of one-sided destructive quantum interference based on lossy metasurfaces. It corresponds to one-sided beam splitting with 50:25:0 in percentage ratio among the transmission and the two reflection efficiencies, which can be realized by a metasurface with unidirectional zero reflection (UZR) from a non-Hermitian exceptional point. When two identical photons enter both sides of the lossy metasurface, quantum interference only occurs for the single-photon output state towards one side but not the other due to UZR. Such one-sided quantum interference can be further made totally destructive. This effect along with UZR provides more degrees of freedom in quantum interference control and entangled states construction.

Automated summary

We propose the concept of one-sided destructive quantum interference based on lossy metasurfaces, which enables unidirectional quantum interference and can be further made totally destructive. This effect, combined with unidirectional zero reflection (UZR), provides more degrees of freedom in quantum interference control and entangled states construction.