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Related Experiment Videos

Theory of microwave parametric down-conversion and squeezing using circuit QED.

K Moon1, S M Girvin

  • 1Sloane Physics Laboratory, PO Box 208120, Yale University, New Haven, Connecticut 06520-8120, USA.

Physical Review Letters
|October 26, 2005
PubMed
Summary

We theoretically demonstrate microwave squeezing using superconducting qubits in a resonator. This method, leveraging cavity quantum electrodynamics, can achieve 95% squeezing, significantly below vacuum noise.

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Area of Science:

  • Quantum optics
  • Superconducting circuits
  • Cavity quantum electrodynamics

Background:

  • Parametric down-conversion and squeezing are crucial quantum phenomena.
  • Superconducting circuits, particularly Cooper-pair box (CPB) qubits, are promising for quantum information processing.
  • Cavity quantum electrodynamics (cQED) provides a framework for strong light-matter interactions.

Purpose of the Study:

  • To theoretically investigate microwave squeezing generation.
  • To explore the role of a superconducting CPB qubit in a transmission line resonator for parametric down-conversion.
  • To determine the feasibility of achieving significant squeezing levels.

Main Methods:

  • Theoretical study of parametric down-conversion and squeezing.

Related Experiment Videos

  • Utilizing cavity quantum electrodynamics with a superconducting Cooper-pair box (CPB) qubit inside a transmission line resonator.
  • Analyzing the nonlinear susceptibility (chi2) and its tunability via dc gate voltage.

    • Main Results:

    • The nonlinear susceptibility chi2, responsible for three-wave mixing, is tunable by gate voltage and vanishes at the charge degeneracy point.
    • Coherent coupling of cavity modes through the qubit can generate a squeezed microwave state.
    • Squeezing levels of approximately 95% (13 dB below vacuum noise) are predicted to be achievable.

    Conclusions:

    • Superconducting CPB qubits in resonators offer a viable platform for generating highly squeezed microwave states.
    • The proposed method provides a pathway to engineer non-classical microwave states for quantum technologies.
    • Experimental parameters from recent circuit QED experiments support the feasibility of achieving substantial squeezing.