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Related Experiment Videos

Qubit measurements with a double-dot detector.

T Gilad1, S A Gurvitz

  • 1Department of Particle Physics, Weizmann Institute of Science, Rehovot 76100, Israel.

Physical Review Letters
|October 10, 2006
PubMed
Summary
This summary is machine-generated.

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We developed a higher-temperature qubit monitor using a double-dot (DD) detector. Proper parameter selection improves signal-to-noise, but quantum interference causes unexpected measurement errors.

Area of Science:

  • Quantum Computing
  • Solid-State Physics
  • Quantum Measurement

Background:

  • Qubit monitoring is crucial for quantum computation.
  • Single-dot detectors require low operating temperatures.
  • Developing higher-temperature qubit monitoring is essential for practical quantum systems.

Purpose of the Study:

  • To propose and assess a double-dot (DD) resonant-tunneling detector for qubit monitoring.
  • To investigate the operational characteristics of DD detectors at higher temperatures.
  • To analyze the impact of quantum interference on qubit measurement accuracy.

Main Methods:

  • Derivation of rate equations for the system's density matrix.
  • Analysis of signal-to-noise ratio based on detector parameters and location.

Related Experiment Videos

  • Investigation of quantum interference effects within the DD detector.

    • Main Results:

    • The double-dot detector operates effectively at higher temperatures than single-dot detectors.
    • Optimized detector parameters and placement significantly enhance signal-to-noise ratio.
    • Quantum interference effects within the DD detector are critical for measurement.
    • These interference effects introduce systematic measurement errors, even in stationary states.

    Conclusions:

    • The proposed double-dot detector offers a viable solution for high-temperature qubit monitoring.
    • Careful selection of detector parameters is key to maximizing measurement performance.
    • Understanding and mitigating quantum interference is necessary to avoid systematic errors in qubit measurements.