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Efficient Qubit Measurement with a Nonreciprocal Microwave Amplifier.

F Lecocq1,2, L Ranzani3, G A Peterson1,2

  • 1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.

Physical Review Letters
|January 29, 2021
PubMed
Summary
This summary is machine-generated.

Researchers achieved efficient superconducting qubit measurement using a parametric amplifier, reaching 72% efficiency. This improves quantum feedback protocols and enables studies of weak quantum measurements.

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Area of Science:

  • Quantum Information Science
  • Quantum Computing Hardware

Background:

  • Quantum measurements inherently perturb quantum states.
  • Measurement imperfections limit quantum feedback protocols, quantified by measurement efficiency.

Purpose of the Study:

  • To demonstrate efficient measurement of a superconducting qubit.
  • To improve information flow for quantum feedback protocols.

Main Methods:

  • Utilized a nonreciprocal parametric amplifier to monitor a readout cavity's microwave field.
  • Mitigated losses between the cavity and the amplifier.

Main Results:

  • Achieved a measurement efficiency of (72±4)%.
  • The amplifier's directionality protected the qubit from backaction.

Conclusions:

  • This work enhances strong projective measurements and enables studies of weak measurements.
  • Paves the way for quantum feedback protocols like state stabilization and error correction.