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Widely Tunable, Nondegenerate Three-Wave Mixing Microwave Device Operating near the Quantum Limit

Abstract : We present the first experimental realization of a widely frequency tunable, nondegenerate three-wave mixing device for quantum signals at gigahertz 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 nonlinearity. 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.
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https://hal.archives-ouvertes.fr/hal-00700677
Contributor : Benjamin Huard <>
Submitted on : Thursday, May 24, 2012 - 2:45:42 PM
Last modification on : Friday, September 25, 2020 - 3:35:14 AM
Long-term archiving on: : Friday, March 31, 2017 - 8:33:23 AM

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Nicolas Roch, Emmanuel Flurin, Francois Nguyen, Pascal Morfin, Philippe Campagne-Ibarcq, et al.. Widely Tunable, Nondegenerate Three-Wave Mixing Microwave Device Operating near the Quantum Limit. Physical Review Letters, American Physical Society, 2012, 108, pp.147701. ⟨10.1103/PhysRevLett.108.147701⟩. ⟨hal-00700677v2⟩

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