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Article overview
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Nonreciprocal microwave signal processing with a Field-Programmable Josephson Amplifier | | F. Lecocq
; L. Ranzani
; G. A. Peterson
; K. Cicak
; R. W. Simmonds
; J. D. Teufel
; J. Aumentado
; | | Date: |
5 Dec 2016 | | Abstract: | We report on the design and implementation of a Field Programmable Josephson
Amplifier (FPJA) - a compact and lossless superconducting circuit that can be
programmed extit{in situ} by a set of microwave drives to perform reciprocal
and nonreciprocal frequency conversion and amplification. In this work we
demonstrate four modes of operation: frequency conversion ($-0.5~mathrm{dB}$
transmission, $-30~mathrm{dB}$ reflection), circulation ($-0.5~mathrm{dB}$
transmission, $-30~mathrm{dB}$ reflection, $30~mathrm{dB}$ isolation),
phase-preserving amplification (gain $>20~mathrm{dB}$, $1~mathrm{photon}$ of
added noise) and directional phase-preserving amplification ($-10~mathrm{dB}$
reflection, $18~mathrm{dB}$ forward gain, $8~mathrm{dB}$ reverse isolation,
$1~mathrm{photon}$ of added noise). The system exhibits quantitative agreement
with theoretical prediction. Based on a gradiometric Superconducting Quantum
Interference Device (SQUID) with Nb/Al-AlO$_x$/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 toward on-chip integration with superconducting quantum
circuits such as qubits or microwave optomechanical systems. | | Source: | arXiv, 1612.1438 | | Services: | Forum | Review | PDF | Favorites | |
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