Quantum state tomography of an itinerant squeezed microwave field

Details Quantum state tomography of an itinerant squeezed microwave field Quantum state tomography of an itinerant squeezed microwave field

2010-11-30

arxiv.org/abs/1012.0007v2

Physics

Quantum Physics

8 pages, 5 figures, published version to contain higher resolution figures

Scientific paper

We perform state tomography of an itinerant squeezed state of the microwave field prepared by a Josephson parametric amplifier (JPA). We use a second JPA as a pre-amplifier to improve the quantum efficiency of the field quadrature measurement (QM) from 2% to 36 +/- 4%. Without correcting for the detection inefficiency we observe a minimum quadrature variance which is 69 +/- 8% of the variance of the vacuum. We reconstruct the state's density matrix by a maximum likelihood method and infer that the squeezed state has a minimum variance less than 40% of the vacuum, with uncertainty mostly caused by calibration systematics.

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