Antibunched Photons from Inelastic Cooper-Pair Tunneling
Juha Leppäkangas, Mikael Fogelström, Alexander Grimm, Max Hofheinz, Michael Marthaler, Göran Johansson
DOI 10.1103/PhysRevLett.115.027004 · Physical Review Letters
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Abstract
We demonstrate theoretically that charge transport across a Josephson junction, voltage-biased through a resistive environment, produces antibunched photons. We develop a continuous-mode description of the emitted radiation field in a semi-infinite transmission line terminated by the Josephson junction. Within a perturbative treatment in powers of the tunneling coupling across the Josephson junction, we capture effects originating in charging dynamics of consecutively tunneling Cooper pairs. We find that within a feasible experimental setup the Coulomb blockade provided by high zero-frequency impedance can be used to create antibunched photons at a very high rate and in a very versatile frequency window ranging from a few GHz to a THz.
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