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TT: Fachverband Tiefe Temperaturen

TT 5: Transport: Quantum Coherence and Quantum Information Systems - Experiment
(Joint session of HL, MA and TT organized by TT)

TT 5.9: Vortrag

Montag, 7. März 2016, 12:15–12:30, H22

Quantum correlations in microwave frequency combs — •Thomas Weissl¹, Erik Tholén², Daniel Forchheimer^1,2, and David B. Haviland¹ — ¹KTH- Royal Institute of Technology, 106 91 Stockholm, Sweden — ²Intermodulation Products AB, 823 93 Segersta, Sweden

Non-linear superconducting resonators are used as parametric amplifiers in circuit quantum electrodynamics experiments [1]. When pumped below threshold the pump correlates vacuum fluctuations in the signal and idler bands giving rise to two-mode squeezed vacuum. When a non-linear oscillator is pumped with a frequency comb complex multipartite entangled states can be created as demonstrated in similar experiments in the optical domain [2]. We present a method to generate and measure microwave frequency combs by up- and down-conversion from intermediate frequencies. The comb is generated and analyzed using a multi-frequency lock-in amplifier. From transmission measurements we extract correlation- and quasi-probability functions.
E. Tholén et al., APL 90, 253509 (2007)
M. Chen et al., PRL 112, 120505 (2014)