Field Programmable Josephson Amplifier for non-reciprocal microwave signal processing

Published: February 17, 2017


Florent Q. Lecocq, Leonardo Ranzani, Gabriel A. Peterson, Katarina Cicak, Raymond W. Simmonds, John D. Teufel, Jose A. Aumentado


We report on the design and implementation of a Field Programmable Josephson Amplifier (FPJA) - a compact and lossless superconducting circuit that can be programmed in-situ by a set of microwave drives to perform reciprocal and non-reciprocal frequency conversion and amplification. In this work we demonstrate four modes of operation: frequency conversion (90% transmission, 0.1% reflection), circulation (90% transmission, 0.1% reflection, 30dB isolation), phase-preserving amplification (gain >20dB, 1 photon of added noise) and directional phase-preserving amplification (5% reflection, 18dB forward gain, 10dB reverse isolation, 1 photon of added noise). The system exhibits quantitative agreement with theoretical prediction. Based on a gradiometric Superconducting Quantum Interference Device (SQUID) with Nb/Al--AlOx/Nb Josephson junctions, the FPJA is first-order insensitive to flux noise and can be operated without magnetic shielding at low temperature. Due to its flexible design and compatibility with existing superconducting fabrication techniques, the FPJA offers a straightforward route towards on-chip integration with superconducting quantum circuits such as qubits or microwave optomechanical systems.
Citation: Physical Review Applied
Volume: 7
Pub Type: Journals


reciprocity, microwave amplifier, circulator, parametric amplification, superconducting circuits, frequency conversion, quantum-limited amplification
Created February 17, 2017, Updated July 08, 2019