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Continuous measurement of a microwave-driven solid state qubit.

S D Barrett1, T M Stace

  • 1Hewlett-Packard Laboratories, Filton Road, Stoke Gifford, Bristol BS34 8QZ, United Kingdom. seandbarrett@gmail.com

Physical Review Letters
|February 21, 2006
PubMed
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We analyzed a solid state charge qubit

Area of Science:

  • Quantum computing
  • Solid-state physics
  • Quantum information science

Background:

  • Continuously observed, damped, microwave-driven solid state charge qubits are crucial for quantum information processing.
  • Understanding qubit dynamics, including dephasing and relaxation, is essential for improving quantum computations.

Purpose of the Study:

  • To analyze the dynamics of a microwave-driven solid state charge qubit.
  • To extract key qubit parameters from detector output.
  • To propose an advanced single-shot electron spin readout technique.

Main Methods:

  • Continuous observation and damping of a solid state charge qubit.
  • Microwave field application to induce qubit eigenstate transitions.
  • Analysis of detector output current, conductance, and noise power spectrum.

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Main Results:

  • Qubit dynamics significantly affect detector output current.
  • Dephasing and relaxation rates, and Rabi frequency, are extractable from experimental data.
  • A novel single-shot electron spin readout technique was proposed.

Conclusions:

  • The study provides insights into solid state charge qubit dynamics.
  • The proposed readout technique offers practical advantages for spin-based quantum information processing.
  • This research contributes to the advancement of quantum computing technologies.