Phase-preserving amplification near the quantum limit with a Josephson ring modulator

N. Bergeal (), F. Schackert, M. Metcalfe, R. Vijay, V. E. Manucharyan, L. Frunzio, D. E. Prober, R. J. Schoelkopf, S. M. Girvin and M. H. Devoret ()
Additional contact information
N. Bergeal: Yale University, New Haven, Connecticut 06520-8284 USA
F. Schackert: Yale University, New Haven, Connecticut 06520-8284 USA
M. Metcalfe: Yale University, New Haven, Connecticut 06520-8284 USA
R. Vijay: Yale University, New Haven, Connecticut 06520-8284 USA
V. E. Manucharyan: Yale University, New Haven, Connecticut 06520-8284 USA
L. Frunzio: Yale University, New Haven, Connecticut 06520-8284 USA
D. E. Prober: Yale University, New Haven, Connecticut 06520-8284 USA
R. J. Schoelkopf: Yale University, New Haven, Connecticut 06520-8284 USA
S. M. Girvin: Yale University, New Haven, Connecticut 06520-8284 USA
M. H. Devoret: Yale University, New Haven, Connecticut 06520-8284 USA

Nature, 2010, vol. 465, issue 7294, 64-68

Abstract: Quantum electronics: noise abatement The processing of the single-quantum-level signals produced by current nanoscale solid-state devices such as qubits and nanomechanical resonators would require the development of very sensitive active circuits, such as amplifiers or frequency up- and down-converters that could attain the ultimate performances limited by the laws of quantum mechanics, while remaining of practical use. Bergeal et al. now demonstrate a phase-preserving, superconducting parametric amplifier with ultra-low noise properties, following theoretical principles recently presented in Nature Physics ( http://go.nature.com/F7lwR2 ). Based on a Josephson ring modulator, the new device can operate within a factor of three of the quantum limit. Possible applications include quantum analog signal processing such as the production of entangled microwave signal pairs.

Date: 2010
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DOI: 10.1038/nature09035

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