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Related Experiment Videos

Quantum superposition of macroscopic persistent-current states.

C H van der Wal1, A C ter Haar, F K Wilhelm

  • 1Department of Applied Physics and Delft Institute for Micro Electronics and Submicron Technology (DIMES), Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands. caspar@qt.tn.tudelft.nl

Science (New York, N.Y.)
|October 29, 2000
PubMed
Summary
This summary is machine-generated.

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Superconducting quantum circuits with Josephson junctions exhibit level repulsion between macroscopic quantum states. This demonstrates quantum superposition of persistent currents in a macroscopic superconducting loop.

Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Superconductivity

Background:

  • Macroscopic quantum phenomena are challenging to observe.
  • Josephson junctions enable control over quantum states in superconducting circuits.

Purpose of the Study:

  • Investigate quantum behavior in a macroscopic superconducting loop.
  • Observe quantum superposition of persistent current states.

Main Methods:

  • Microwave spectroscopy was used.
  • Experiments were conducted on a superconducting loop with three Josephson junctions.

Main Results:

  • Observed level repulsion between the ground and first excited states.
  • Identified symmetric and antisymmetric quantum superpositions of macroscopic states.

Related Experiment Videos

  • Characterized degenerate classical persistent-current states with opposite polarity (0.5 microampere).

    • Conclusions:

    • The experiments confirm quantum superposition in a macroscopic system.
    • The findings provide insights into the quantum nature of persistent currents.