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- Title
Analog information processing at the quantum limit with a Josephson ring modulator.
- Authors
Bergeal, N.; Vijay, R.; Manucharyan, V. E.; Siddiqi, I.; Schoelkopf, R. J.; Girvin, S. M.; Devoret, M. H.
- Abstract
Amplifiers are crucial in every experiment carrying out a very sensitive measurement. However, they always degrade the information by adding noise. Quantum mechanics puts a limit on how small this degradation can be. Theoretically, the minimum noise energy added by a phase-preserving amplifier to the signal it processes amounts at least to half a photon at the signal frequency. Here we propose a practical microwave device that can fulfil the minimal requirements to reach the quantum limit. The availability of such a device is of importance for the readout of solid-state qubits, and more generally for the measurement of very weak signals in various areas of science. We discuss how this device can be the basic building block for a variety of practical applications, such as amplification, noiseless frequency conversion, dynamic cooling and production of entangled signal pairs.
- Subjects
ANALOG electronic systems; JOSEPHSON effect; QUANTUM theory; MICROWAVE devices; SOLID state electronics
- Publication
Nature Physics, 2010, Vol 6, Issue 4, p296
- ISSN
1745-2473
- Publication type
Article
- DOI
10.1038/nphys1516