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We propose the concept of one-sided quantum interference based onnon-Hermitian metasurfaces.By designing bianisotropic metasurfaces with anon-Hermitian exceptional point, we show that quantum interference can existonly on only one side but not another. This is the quantum inheritance ofunidirectional zero reflection in classical optics.The one-side interferencecan be further manipulated with tailor-made metasurface. With two photonssimultaneously entering the metasurface from different sides, the probabilityfor only outputting one photon on the side with reflection can be modified tozero as a one-sided destructive quantum interference while the output onanother side is free of interference. We design the required bianisotropicmetasurface and numerically demonstrate the proposed effect. The non-Hermitianbianisotropic metasurfaces provide more degrees of freedom in tuning two-photonquantum interference, in parallel to the celebrated Hong-Ou-Mandel effect.

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