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Breaking the time-reversal symmetry of light is of great importance forfundamental physics and has attracted increasing interest in the study ofnon-reciprocal photonic devices. Here, we experimentally demonstrate a chiralcavity QED system with multiple atoms strongly coupled to a Fabry-Perot cavity.By polarizing the internal quantum state of the atoms, the time-reversalsymmetry of the atom-cavity interaction is broken. The strongly coupledatom-cavity system can be described by non-reciprocal quasiparticles, i.e., thecavity polariton. When it works in the linear regime, the inherentnonreciprocity makes the system work as a single-photon-level optical isolator.Benefiting from the collective enhancement of multiple atoms, an isolationratio exceeding 30~dB on the single-quanta level (~0.1 photon on average) isachieved. The validity of the non-reciprocal device under zero magnetic fieldand the reconfigurability of the isolation direction are also experimentallydemonstrated. Moreover, when the cavity polariton works in the nonlinearregime, the quantum interference between polaritons with weak anharmonicityinduces non-reciprocal nonclassical statistics of cavity transmission fromcoherent probe light.

Non-reciprocal Cavity Polariton with Atoms Strongly Coupled to Optical Cavity