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arXiv · 1802.07323

Parametric amplification and squeezing with an ac- and dc-voltage biased superconducting junction

Udson C. Mendes·Sébastien Jezouin·Philippe Joyez·Bertrand Reulet·Alexandre Blais·Fabien Portier·Christophe Mora·Carles Altimiras
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Abstract

We theoretically investigate a near-quantum-limited parametric amplifier based on the nonlinear dynamics of quasiparticles flowing through a superconducting-insulator-superconducting junction. Photon-assisted tunneling, resulting from the combination of dc- and ac-voltage bias, gives rise to a strong parametric interaction for the electromagnetic modes reflected by the junction coupled to a transmission line. We show phase-sensitive and phase-preserving amplification, together with single- and two-mode squeezing. For an aluminum junction pumped at twice the center frequency, $ω_0/2π=6$~GHz, we predict narrow-band phase-sensitive amplification of microwaves signals to more than 20 dB, and broadband phase-preserving amplification of 20 dB over a 1.2 GHz 3-dB bandwidth. We also predict single- and two-mode squeezing reaching more than -12 dB over 5.3 GHz 3-dB bandwidth. Moreover, with a simple impedance matching circuit, we demonstrate 3 dB bandwidth reaching 4.3 GHz for 20 dB of gain. A key feature of the device is that its performance can be controlled in-situ with the applied dc- and ac-voltage biases.

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Udson C. Mendes, Sébastien Jezouin, Philippe Joyez, Bertrand Reulet, Alexandre Blais, Fabien Portier, Christophe Mora, Carles Altimiras. 2019-03-06. Parametric amplification and squeezing with an ac- and dc-voltage biased superconducting junction. https://doi.org/10.1103/physrevapplied.11.034035

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