Abstract
We investigate theoretically the photon statistics in a coupled cavity system mediated by a two-level atom. The system consists of a linear cavity weakly driven by a continuous laser, and a nonlinear cavity containing an atom inside. We find that there exists a photon blockade in the linear cavity for both parameter regimes where the coupling strength between the atom and the nonlinear cavity is greater (or less) than the dissipation rate of the linear cavity. We also extend our model by pumping the two cavities simultaneously and find that the conventional photon blockade is apparent in the linear cavity, whereas the unconventional photon blockade appears in the nonlinear cavity. These results show that our work has potential applications for a single photon source in a weakly nonlinear system.
Highlights
Single photon source and single photon detectors have great potential applications in precision measurement instruments, quantum information computing, and quantum communications [1,2].For instances, in quantum information science, single photons can be promising quantum bits on which information can be encoded using interferometers or polarization, and can be used in quantum key distribution and other applications
We find that there are conventional and unconventional photon blockade effects when the first cavity, the second cavity, and the atom are resonant with the driving laser
We have studied the photon statistics of a coupled cavity quantum electrodynamics (QED) system that consists of a linear cavity and a nonlinear cavity that consists of a two-level atom
Summary
Single photon source and single photon detectors have great potential applications in precision measurement instruments, quantum information computing, and quantum communications [1,2]. For obtaining the unconventional photon blockade, we introduce a two-level atom system in Cavity B. We use a pump laser to couple the cavity field, and the interaction between the cavity and the atom can be effectively manipulated, which provide a method for realization of the unconventional photon blockade. Jaynes–Cummings model and study the conventional and unconventional photon blockade effect in a linear cavity coupled to a nonlinear cavity. The second cavity provides different transition paths for the photons in the first cavity. We find that there are conventional and unconventional photon blockade effects when the first cavity, the second cavity, and the atom are resonant with the driving laser. A, the second number denoting the photon number with the first number denoting the photon number in Cavity A, the second number denotinginthe
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