Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 61: Superconductivity: Superconducting Electronics II and Cryotechnique
TT 61.3: Vortrag
Mittwoch, 14. März 2018, 15:45–16:00, H 2053
An on-demand source of anti-bunched microwave photons — •Florian Blanchet1, Romain Albert1, Salha Jebari1, Alexander Grimm2, and Max Hofheinz1 — 1Univ. Grenoble Alpes & CEA, INAC-PHELIQS, Grenoble, France — 2Departement of Applied Physics, Yale University, New Haven, USA
Most superconducting devices use the Josephson junction in the zero-voltage branch where the junction behaves as a nonlinear inductor. However, Cooper pairs can tunnel through the Josephson junction also at non-zero bias voltage if the energy of a tunneling Cooper pair can be dissipated, e.g. in the form of photons [1]. By coupling the junction to a transmission line, we can detect these photons associated to inelastic Cooper pair tunneling [2] and measure their statistics.
In most configurations, the emitted photons have the same Poisson statistics as the tunneling Cooper pairs, corresponding to independent tunneling events. However, by designing particular high-impedance microwave circuits, we can tune the photon statistics to also be non-classical[3]. I will show that the photons emitted by such a circuit can be strongly anti-bunched.
In addition, we have replaced the Josephson junction by a SQUID which allows us to modulate the effective Josephson energy by applying magnetic flux pulses. We use these pulses to generate anti-bunched photons on demand up to rates > 150 MHz.
PRL 73, 3455 (1994)
PRL 106, 217005 (2011)
PRL 115, 027004 (2015)