Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 45: Transport: Quantum Coherence and Quantum Information Systems - Experiment (jointly with MA, HL)
HL 45.13: Talk
Wednesday, March 22, 2017, 12:45–13:00, HSZ 03
Josephson-photonics devices as source of non-classical microwave radiation — •Björn Kubala1, Joachim Ankerhold1, Chloe Rolland2, Marc P. Westig2, Iouri Moukharski2, Daniel Esteve2, and Fabien Portier2 — 1Institute for Complex Quantum Systems and IQST, Ulm University, Ulm, Germany — 2CEA Saclay, Gif-sur-Yvette, France
Sources of non-classical photons have important applications in quantum communication and sensing technologies. With non-classical microwave sources these are extended to circuit-QED setups extensively used for various quantum information tasks.
Here, we report recent experimental result, demonstrating that a dc-biased Josephson junction embedded in a carefully engineered electromagnetic environment constitutes a new source of bright non-classical radiation. We will explain, why in such a “Josephson-photonics” device with a single mode of large impedance strongly anti-bunched photons are produced, opening the path to a single-photon source in the microwave range. A Cooper-pair crossing a junction, which is coupled to two resonators, under the proper dc-bias emits a pair of photons into the two resonators and thus produces correlated light with strongly reduced noise [1]. Measurements of this noise reduction factor demonstrate the non-classical nature of the light source.
[1] A. D. Armour, B. Kubala, and J. Ankerhold, Phys. Rev. B 91, 184508 (2015)