Flux-driven Josephson parametric amplifier

By Tsuyoshi Yamamoto, K. Inomata, M. Watanabe, K. Matsuba, T. Miyazaki, William D. Oliver, Yasunobu Nakamura, J. Tsai. 2008

422 citations recorded by the source corpus.

We have developed a Josephson parametric amplifier, comprising a superconducting coplanar waveguide resonator terminated by a dc SQUID (superconducting quantum interference device). An external field (the pump, $\sim 20$ GHz) modulates the flux threading the dc SQUID, and, thereby, the resonant frequency of the cavity field (the signal, $\sim 10$ GHz), which leads to parametric signal amplification. We operated the amplifier at different band centers, and observed amplification (17 dB at maximum) and deamplification depending on the relative phase between the pump and the signal. The noise temperature is estimated to be less than 0.87 K.

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Citations in the corpus

Superconducting Parametric Amplifiers: The State of the Art in Josephson Parametric Amplifiers (2020, background): “[12] a few years after the invention of dispersive qubit state measurement [1] and the advent of the superconducting transmon qubit [13].”
Circuit quantum electrodynamics (2020, unknown): “(158), an alternative approach to arrive at HJPA is to replace the junction by a SQUID and to apply a flux modulation at 2ω0 (Yamamoto et al., 2008).”
Analog information processing at the quantum limit with a Josephson ring modulator (2008, background): “However, recent progress in quantum information processing using microwave interrogation of solid states qubits[13, 14, 15, 16] gave rise to a growing need for low-noise amplifiers which are sensitive enough to measure the extremely weak signals involved in these new devices and renewed the interest”
Optimizing the Nonlinearity and Dissipation of a SNAIL Parametric Amplifier for Dynamic Range (2018, background): “Akin to the Josephson Parametric Amplifier (JPA) [19, 20], the SPA is realized by placing M SNAILs at the center of a λ/2 section of microstrip transmission line (Fig.”
Colloquium: Stimulating uncertainty: Amplifying the quantum vacuum with superconducting circuits (2011, methodology): “Modulating the flux applied through the SQUID at twice the resonance frequency was observed to amplify a small input signal and lead to quadrature squeezing (Yamamoto et al., 2008), and to induce parametric oscillations in the absence of an input signal (Wilson et al., 2010).”
Introduction to parametric amplification of quantum signals with Josephson circuits (2016, methodology): “This type of amplifier has been implemented in several labs [20, 21, 22, 23].”