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Related Experiment Videos

Inductive single-electron transistor.

Mika A Sillanpää1, Leif Roschier, Pertti J Hakonen

  • 1Low Temperature Laboratory, Helsinki University of Technology, Otakaari 3 A, Espoo PO Box 2200, FIN-02015, Finland.

Physical Review Letters
|August 25, 2004
PubMed
Summary
This summary is machine-generated.

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We developed a sensitive charge detection method using superconducting single-electron transistors. This radio-frequency technique offers significantly lower energy dissipation for advanced quantum measurements.

Area of Science:

  • Quantum electronics
  • Superconducting devices
  • Nanoscale charge sensing

Background:

  • Superconducting single-electron transistors (SSETs) are sensitive to single charges.
  • Existing radio-frequency (RF) electrometry methods suffer from high energy dissipation.
  • Precise charge detection is crucial for quantum information processing and fundamental physics.

Purpose of the Study:

  • To demonstrate a novel, low-dissipation charge detection method using SSETs.
  • To achieve high charge sensitivity via RF readout of Josephson inductance.
  • To explore the potential for ultra-low energy sensitivity in quantum measurements.

Main Methods:

  • Utilizing the Josephson inductance of an SSET for charge sensing.
  • Employing radio-frequency (RF) readout techniques for signal detection.

Related Experiment Videos

  • Operating the SSET in a nonlinear regime to enhance sensitivity.

    • Main Results:

    • Achieved a charge sensitivity of 1.4 x 10^-4 e/√Hz, limited by the preamplifier.
    • Demonstrated a significant reduction in energy dissipation (over 2 orders of magnitude) compared to existing RF electrometry.
    • The method leverages reactive readout for improved efficiency.

    Conclusions:

    • The demonstrated RF readout method offers a highly sensitive and low-dissipation approach for charge detection.
    • This technique holds promise for achieving unprecedented energy sensitivity in quantum experiments.
    • Further optimization of SSETs could lead to uncoupled energy sensitivity below Planck's constant over h.