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Parity-Protected Superconductor-Semiconductor Qubit.

T W Larsen1, M E Gershenson2, L Casparis1

  • 1Center for Quantum Devices and Microsoft Quantum Lab-Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.

Physical Review Letters
|August 16, 2020
PubMed
Summary
This summary is machine-generated.

We developed a new parity-protected qubit using semiconductor nanowire Josephson junctions. This design significantly improves qubit coherence by protecting Cooper pairs, suppressing relaxation tenfold.

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Area of Science:

  • Quantum computing
  • Condensed matter physics
  • Superconducting devices

Background:

  • Superconducting qubits are crucial for quantum computing.
  • Qubit coherence is limited by noise and decoherence.
  • Protecting Cooper pair parity can enhance qubit stability.

Purpose of the Study:

  • To introduce a novel parity-protected qubit design.
  • To leverage semiconductor nanowire Josephson junctions for improved qubit performance.
  • To demonstrate enhanced coherence through parity protection.

Main Methods:

  • Fabrication of voltage-controlled semiconductor nanowire Josephson junctions.
  • Construction of a symmetric interferometer with two such junctions.
  • Application of a half-quantum flux to frustrate the interferometer.
  • Characterization of the energy-phase relation and qubit relaxation.

Main Results:

  • Demonstrated a cos(2φ) Josephson element due to coherent transport of Cooper pair pairs.
  • Achieved a tenfold suppression of qubit relaxation by tuning into the protected regime.
  • Confirmed the effectiveness of parity protection in improving qubit coherence.

Conclusions:

  • The developed parity-protected qubit offers a promising route to enhance coherence in superconducting quantum computing.
  • Semiconductor nanowire Josephson junctions provide a tunable platform for realizing exotic Josephson elements.
  • This work paves the way for more robust and scalable quantum processors.