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Robust optimal quantum gates for Josephson charge qubits.

Simone Montangero1, Tommaso Calarco, Rosario Fazio

  • 1NEST-CNR-INFM and Scuola Normale Superiore, piazza dei Cavalieri 7, I-56126 Pisa, Italy.

Physical Review Letters
|November 13, 2007
PubMed
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We developed a quantum control protocol to design high-fidelity two-bit gates for Josephson charge qubits. This method enhances gate accuracy and robustness against noise, enabling fault-tolerant quantum computation.

Area of Science:

  • Quantum Information Science
  • Quantum Computing Hardware

Background:

  • Accurate quantum gates are essential for scalable quantum computation.
  • Josephson charge qubits are a promising platform, but susceptible to leakage and noise.
  • 1/f noise poses a significant challenge to qubit performance.

Purpose of the Study:

  • To design high-fidelity two-bit gates for Josephson charge qubits.
  • To improve gate robustness against leakage and 1/f noise.
  • To achieve gate fidelities suitable for fault-tolerant quantum computing.

Main Methods:

  • Employing quantum optimal control theory.
  • Designing two-bit gates specifically for Josephson charge qubits.
  • Simulating gate performance under realistic noise conditions, including 1/f noise.

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Main Results:

  • Achieved significantly increased gate fidelity.
  • Demonstrated robustness against leakage and 1/f noise.
  • Obtained error rates in the range of 10^-3 to 10^-4.

Conclusions:

  • The developed protocol enables high-fidelity, robust two-bit gates for Josephson charge qubits.
  • The achieved performance crosses the fault tolerance threshold.
  • This work advances the practical implementation of quantum computers.