Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 69: Quantum Information: Quantum Computing and Communication IV
Q 69.1: Vortrag
Freitag, 4. März 2016, 14:30–14:45, e214
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
Multipartite entangled states in frequency combs have possible application as a universal resource for continuous wave quantum computation. In the optical frequency range, bipartite entanglement between different frequencies in frequency combs generated by parametric down-conversion has been demonstrated [1,2]. In comparison with optical systems, superconducting microwave circuits can be designed with much stronger coupling strength between (artificial) atoms and the electromagnetic field, as well as much stronger non-linearity that couple the various tones of a frequency comb. We present a method to create and to measure quadrature response of a microwave frequency comb, based on up- and down-conversion of a digitally synthesized and digitally demodulated low-frequency comb. The method works with as many as 42 frequencies. When a non-linear superconducting resonator is pumped with the GHz comb, the tones in the comb become correlated due to the strong non-linearity. We show preliminary results on the analysis of these correlations. [1] J. Roslund et al., Nature Photonics 8, 109-112 (2014) [2] M. Chen et al., PRL 112, 120505 (2014)