Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 52: Superconducting Electronics: SQUIDs, Qubits, Circuit QED, Quantum Coherence and Quantum Information Systems 2 (joint session TT/HL)

TT 52.9: Vortrag

Donnerstag, 19. März 2020, 11:45–12:00, HSZ 03

Josephson-Photonics Devices as a Source of Entangled Microwave Photons — •Björn Kubala1, Ambroise Peugeot2, Simon Dambach1,3, Juha Leppäkangas4, Marc Westig2, Gerbold Menard2, Yuri Mukharsky2, Carles Altimiras2, Patrice Roche2, Philippe Joyez2, Denis Vion2, Daniel Esteve2, Fabien Portier2, and Joachim Ankerhold11ICQ and IQST, Ulm University, Germany — 2SPEC, CEA Paris-Saclay, France — 3School of Physics and Astronomy, University of Nottingham, UK — 4Physikalisches Institut, Karlsruhe Institute of Technology, Germany

The realization and characterization of efficient sources of entangled microwave photons is of paramount importance for many future applications of quantum technology. Josephson-photonics devices are very promising candidates for this task since they allow one to create a broad range of different entangled states in a surprisingly simple and robust way. Such devices consist of a dc-voltage-biased Josephson junction which is placed in series to several microwave cavities. Steady states with multifaceted entanglement properties then appear in steady state resulting from the interplay of multiphoton creation processes associated with the inelastic tunneling of Cooper pairs and subsequent individual photon leakage from the cavities. In this talk, we present a detailed theoretical study of the bipartite entanglement between photon pairs in the output transmission lines. Numerical simulations, taking into account low-frequency fluctuations of the bias voltage and the finite bandwidth of microwave signal detectors, show excellent agreement with recent experimental data.

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