Phase-preserving amplification near the quantum limit with a Josephson ring modulator (original) (raw)

Nature volume 465, pages 64–68 (2010)Cite this article

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Abstract

Recent progress in solid-state quantum information processing1 has stimulated the search for amplifiers and frequency converters with quantum-limited performance in the microwave range. Depending on the gain applied to the quadratures of a single spatial and temporal mode of the electromagnetic field, linear amplifiers can be classified into two categories (phase sensitive and phase preserving) with fundamentally different noise properties2. Phase-sensitive amplifiers use squeezing to reduce the quantum noise, but are useful only in cases in which a reference phase is attached to the signal, such as in homodyne detection. A phase-preserving amplifier would be preferable in many applications, but such devices have not been available until now. Here we experimentally realize a proposal3 for an intrinsically phase-preserving, superconducting parametric amplifier of non-degenerate type. It is based on a Josephson ring modulator, which consists of four Josephson junctions in a Wheatstone bridge configuration. The device symmetry greatly enhances the purity of the amplification process and simplifies both its operation and its analysis. The measured characteristics of the amplifier in terms of gain and bandwidth are in good agreement with analytical predictions. Using a newly developed noise source, we show that the upper bound on the total system noise of our device under real operating conditions is three times the quantum limit. We foresee applications in the area of quantum analog signal processing, such as quantum non-demolition single-shot readout of qubits4, quantum feedback5 and the production of entangled microwave signal pairs6.

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Figure 1: The JPC and its microwave measurement set-up.

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Figure 2: Gain of the JPC.

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Figure 3: Tuning the bandwidth of the JPC.

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Figure 4: Noise measurement of the JPC for a 30-dB gain.

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Acknowledgements

We thank B. Abdo for his reading of the manuscript. This work was supported by the US National Security Agency through the US Army Research Office grant W911NF-05-01-0365, the W. M. Keck Foundation, and the US National Science Foundation through grant DMR-032-5580. M.H.D. acknowledges partial support from the College de France and from the French Agence Nationale de la Recherche.

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Authors and Affiliations

  1. Department of Physics and Applied Physics, Yale University, New Haven, Connecticut 06520-8284 USA,
    N. Bergeal, F. Schackert, M. Metcalfe, R. Vijay, V. E. Manucharyan, L. Frunzio, D. E. Prober, R. J. Schoelkopf, S. M. Girvin & M. H. Devoret
  2. LPEM-UPR5, CNRS, ESPCI ParisTech, 10 Rue Vauquelin, 75005 Paris, France,
    N. Bergeal
  3. The Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA,
    M. Metcalfe
  4. Department of Physics, University of California, Berkeley, California 94720-7300, USA,
    R. Vijay

Authors

  1. N. Bergeal
  2. F. Schackert
  3. M. Metcalfe
  4. R. Vijay
  5. V. E. Manucharyan
  6. L. Frunzio
  7. D. E. Prober
  8. R. J. Schoelkopf
  9. S. M. Girvin
  10. M. H. Devoret

Contributions

N.B. and L.F. fabricated the device. N.B., assisted by F.S. and M.M., performed the measurements. N.B. and M.H.D. carried out the analysis of the results and wrote the paper. R.V., V.E.M., R.J.S. and S.M.G. contributed extensively to discussions of the results. D.E.P. suggested the hot-electron noise source for calibration. R.J.S. contributed through his knowledge of ultralow-noise microwave circuits and measurements.

Corresponding authors

Correspondence toN. Bergeal or M. H. Devoret.

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The authors declare no competing financial interests.

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Bergeal, N., Schackert, F., Metcalfe, M. et al. Phase-preserving amplification near the quantum limit with a Josephson ring modulator.Nature 465, 64–68 (2010). https://doi.org/10.1038/nature09035

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Editorial Summary

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.

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