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Related Experiment Videos

Josephson persistent-current qubit

Mooij1, Orlando, Levitov

  • 1Department of Applied Physics and Delft Institute for Microelectronics and Submicron Technologies, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands. Department of Electrical Engineering and Compu.

Science (New York, N.Y.)
|August 14, 1999
PubMed
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A novel qubit design using Josephson junctions is presented, enabling fabrication via electron beam lithography for large-scale quantum computing. This design facilitates quantum superpositions and entanglement through controlled magnetic flux manipulation.

Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Nanofabrication

Background:

  • Development of scalable quantum computers requires robust qubit architectures.
  • Josephson junction-based qubits are promising candidates for quantum information processing.

Purpose of the Study:

  • To design a qubit suitable for integration into large-scale quantum computers.
  • To enable quantum superposition and entanglement using controllable flux modulation.

Main Methods:

  • Fabrication using conventional electron beam lithography.
  • Utilizing a micrometer-sized loop with three or four Josephson junctions.
  • Employing pulsed microwave modulation of enclosed magnetic flux.
  • Implementing a superconducting flux transporter for qubit-to-qubit transfer.

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Main Results:

  • Demonstrated a qubit design with two distinct states characterized by opposite persistent currents.
  • Achieved quantum superpositions via pulsed microwave control of magnetic flux.
  • Enabled controlled flux transfer between qubits, leading to entanglement.

Conclusions:

  • The designed qubit is manufacturable with standard lithography techniques.
  • The architecture supports essential operations for quantum computation, including superposition and entanglement.
  • This work contributes to the advancement of scalable superconducting quantum computing architectures.