Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-02-06
Phys. Rev. Lett. 108, 147701 (2012)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Accepted for Physical Review Letters. Supplementary material can be found in the source package
Scientific paper
10.1103/PhysRevLett.108.147701
We present the first experimental realization of a widely frequency tunable, non-degenerate three-wave mixing device for quantum signals at GHz frequency. It is based on a new superconducting building-block consisting of a ring of four Josephson junctions shunted by a cross of four linear inductances. The phase configuration of the ring remains unique over a wide range of magnetic fluxes threading the loop. It is thus possible to vary the inductance of the ring with flux while retaining a strong, dissipation-free, and noiseless non-linearity. The device has been operated in amplifier mode and its noise performance has been evaluated by using the noise spectrum emitted by a voltage biased tunnel junction at finite frequency as a test signal. The unprecedented accuracy with which the crossover between zero-point-fluctuations and shot noise has been measured provides an upper-bound for the noise and dissipation intrinsic to the device.
Campagne-Ibarcq Philippe
Devoret Michel H.
Flurin Emmanuel
Huard Benjamin
Morfin Pascal
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