We investigate photon coalescence in a lossy non-Hermitian system and study a dynamic device modeled by a beam splitter with an extra intrinsic phase term added in the transformation matrix, with which the device is a lossy non-Hermitian linear system. The two-photon interference behavior is altered accordingly since this extra intrinsic phase affects the unitary of transformation and the coalescence of the incoming photons. We calculate the coincidence between two single-photon pulses, considering the interferometric phase between two pulses and the extra intrinsic phase as the tunable parameters. The extra phase turns the famous Hong–Ou–Mandel dip into a bump, with the visibility dependent on both the interferometric phase and the extra phase.

中文翻译：

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有损非厄密分束器中的光子聚结

我们研究有损非Hermitian系统中的光子聚结，并研究由分束器建模的动态设备，在转换矩阵中添加了额外的本征相项，该设备是有损非Hermitian线性系统。由于此额外的固有相位会影响入射光子的转换和合并的统一性，因此会改变双光子干涉行为。我们将两个脉冲之间的干涉相位和额外的固有相位作为可调参数来计算两个单光子脉冲之间的重合。额外的相位将著名的Hong-Ou-Mandel浸入变成凸点，可见度取决于干涉相和额外的相位。