Novel photon blockade effects with exceptional points

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The key idea of this project is investigating novel photon blockade effects with exceptional points (EPs). Specifically, we have studied:(i) Exceptional photon blockade [Laser & Photonics Reviews 16, 2100430 (2022); first author]. We study photon blockade effects with exceptional points in a microcavity with non-dissipative non-Hermitian coupling between the countercirculating modes. We find that a purely quantum effect, known as single-photon blockade emerges due to EP-induced asymmetric coupling between the optical modes and the nonlinearity-induced anharmonic energy-level spacing.(ii) Loss-induced photon blockade [Physical Review A 106, 043715 (2022); co-corresponding author]. By harnessing EPs, we find that photon blockade can be revived with the help of loss in a nonlinear optical-molecule system. Also, a quantum switch between single-photon blockade and two-photon blockade can be realized by simply tuning the loss.(iii) Nonlinear multi-frequency phonon lasers [Nature Physics 19, 414-419 (2023); co-first author]. Phonon laser, as an analog of photon laser, exploits coherent amplifications of phonons. We report a multiple-frequency phonon laser in a levitated optomechanical system with optical gain.