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Related Experiment Videos

Detection of quantum noise from an electrically driven two-level system.

Richard Deblock1, Eugen Onac, Leonid Gurevich

  • 1Department of Nanoscience and ERATO Mesoscopic Correlation Project, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands. deblock@ps.u-psud.fr

Science (New York, N.Y.)
|July 12, 2003
PubMed
Summary
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Researchers measured high-frequency electrical noise in quantum devices using a novel spectrum analyzer. They detected charge oscillations in a superconducting qubit, demonstrating a new method for probing quantum electron motion.

Area of Science:

  • Quantum electronics and condensed matter physics.
  • Mesoscopic systems and quantum phenomena.

Background:

  • Electron quantum motion significantly impacts electrical noise in mesoscopic devices.
  • Directly measuring high-frequency noise in these systems is challenging.

Purpose of the Study:

  • To develop and demonstrate a method for measuring high-frequency current fluctuations in quantum devices.
  • To probe the influence of quantum electron motion on device noise.

Main Methods:

  • Utilized a superconductor-insulator-superconductor tunnel junction as an on-chip spectrum analyzer.
  • Measured noise from 5 to 90 gigahertz.
  • Coupled the noise detector to quantum devices, including a Josephson junction and a superconducting charge qubit.

Main Results:

Related Experiment Videos

  • Successfully measured high-frequency, nonsymmetrized noise in a Josephson junction.
  • Detected current fluctuations from coherent charge oscillations in a superconducting charge qubit.
  • Observed a distinct peak in spectral noise density corresponding to the qubit's oscillation frequency.

Conclusions:

  • The developed on-chip spectrum analyzer enables sensitive measurement of high-frequency noise in quantum devices.
  • This technique provides a direct probe of quantum electron motion and charge dynamics.
  • The observed noise peak confirms the ability to detect coherent charge oscillations in superconducting qubits.