We show experimentally that a dc biased Josephson junction in series with a high-enough impedance microwave resonator emits antibunched photons. Our resonator is made of a simple micro-fabricated spiral coil that resonates at 4.4 GHz and reaches a 1.97 kΩ characteristic impedance. The second order correlation function of the power leaking out of the resonator drops down to 0.3 at zero delay, which demonstrates the antibunching of the photons emitted by the circuit at a rate of 6 107 photons per second. Results are found in quantitative agreement with our theoretical predictions. This simple scheme could offer an efficient and bright single-photon source in the microwave domain.
@article{arxiv.1810.06217,
title = {Antibunched photons emitted by a dc biased Josephson junction},
author = {C. Rolland and A. Peugeot and S. Dambach and M. Westig and B. Kubala and Y. Mukharsky and C. Altimiras and H. le Sueur and P. Joyez and D. Vion and P. Roche and D. Esteve and J. Ankerhold and F. Portier},
journal= {arXiv preprint arXiv:1810.06217},
year = {2019}
}