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Related Experiment Videos

Radio-frequency Bloch-transistor electrometer.

A B Zorin1

  • 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany.

Physical Review Letters
|May 1, 2001
PubMed
Summary

This study proposes a novel quantum electrometer utilizing a Josephson supercurrent in a Bloch transistor. The device achieves high sensitivity, potentially reaching the standard quantum limit for precise charge measurements.

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Area of Science:

  • Quantum electronics
  • Superconducting devices
  • Metrology

Background:

  • Accurate charge measurement is crucial for quantum technologies.
  • Existing electrometers face limitations in sensitivity and back-action.

Purpose of the Study:

  • To propose a new quantum electrometer design.
  • To achieve high sensitivity in charge measurements, approaching the standard quantum limit.

Main Methods:

  • Utilizing charge modulation of Josephson supercurrent in a Bloch transistor.
  • Employing a superconducting ring inductively coupled to a high-Q resonance tank circuit.
  • Amplifying and detecting variations in oscillation amplitude and phase.

Main Results:

  • The proposed electrometer converts charge variations into detectable oscillations.
  • Device sensitivity is limited by amplifier energy resolution, reducible to the standard quantum limit.
  • A back-action-evading scheme for subquantum limit measurements is presented.

Conclusions:

  • The proposed quantum electrometer offers a pathway to ultra-sensitive charge detection.
  • The design has potential for advancing quantum metrology and quantum information processing.

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