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Antibunched N-photon bundles emitted by a Josephson photonic device

Sheng-li Ma, Xin-ke Li, Ya-long Ren, Ji-kun Xie, Fu-li Li

DOI 10.1103/PhysRevResearch.3.043020 · Physical Review Research

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Abstract

We propose an experimentally feasible scheme for generating antibunched N-photon bundles by a dc voltage-biased Josephson junction in series with a superconducting microwave resonator and a charge qubit. Each resonant tunneling Cooper pair leads to the excitation of the charge qubit and resonator with N photons simultaneously via the ac Josephson effect. Meanwhile, the charge qubit with strong anharmonicity is utilized to regulate the tunneling behavior of the Cooper pairs; that is, the presence of N photons in the resonator prevents the next tunnel event. So the resonator contains only N photons or none, and all other possibilities are greatly suppressed. Combined with the system's dissipation, the resonator can emit its energy in antibunched bundles of N strongly correlated photons with high purity and an in situ tunable emission rate. Such a nonclassical source could be useful in applications in the field of quantum information science.

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