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.
Highlights
In recent years, Josephson photonics of a dc voltagebiased Josephson junction in series with superconducting microwave resonators has received considerable attention as a bright and robust on-chip source of quantum microwaves [1,2,3,4,5,6,7,8]
Through the ac Josephson effect, the inelastic Cooperpair tunneling through the junction can create a coherent flow of microwave photons inside the resonator [9,10,11,12]
We introduce an extra charge qubit into the circuit of a dc voltage-biased Josephson junction coupled to a microwave resonator and aim to control the emission of the resonator in the form of antibunched N-photon bundles
Summary
Josephson photonics of a dc voltagebiased Josephson junction in series with superconducting microwave resonators has received considerable attention as a bright and robust on-chip source of quantum microwaves [1,2,3,4,5,6,7,8]. Our scheme takes advantage of the nonlinear dynamics of the inelastic Cooper-pair tunneling, where the Josephson junction as a voltage-to-frequency converter is explored to realize the N-photon bundle emission with high purity and an in situ tunable rate. It differs fundamentally from the previous proposals [40,41,42,43,44,45,46,47,48].
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