Regensburg 2016 – scientific programme
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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: Talk
Monday, March 7, 2016, 12:15–12:30, H22
Quantum correlations in microwave frequency combs — •Thomas Weissl1, Erik Tholén2, Daniel Forchheimer1,2, 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)