Josephson Parametric Reflection Amplifier with Integrated Directionality

M. P. Westig; T. M. Klapwijk

doi:10.1103/PhysRevApplied.9.064010

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Josephson Parametric Reflection Amplifier with Integrated Directionality

M. P. Westig, T. M. Klapwijk

DOI 10.1103/PhysRevApplied.9.064010 · Physical Review Applied

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Abstract

A directional superconducting parametric amplifier in the GHz frequency range is designed and analyzed, suitable for low-power read-out of microwave kinetic inductance detectors employed in astrophysics and when combined with a nonreciprocal device at its input also for circuit quantum electrodynamics. It consists of a one-wavelength-long nondegenerate Josephson parametric reflection amplifier circuit. The device has two Josephson-junction oscillators, connected via a tailored impedance to an on-chip passive circuit which directs the in- to the output port. The amplifier provides a gain of 20 dB over a bandwidth of 220 MHz on the signal as well as on the idler portion of the amplified input and the total photon shot noise referred to the input corresponds to maximally approximately 1.3 photons per second per Hertz of bandwidth. We predict a factor of 4 increase in dynamic range compared to conventional Josephson parametric amplifiers.