Electrically controlling single-spin qubits in a continuous microwave field

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Science Advances  10 Apr 2015:
Vol. 1, no. 3, e1500022
DOI: 10.1126/sciadv.1500022

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Large-scale quantum computers must be built upon quantum bits that are both highly coherent and locally controllable. We demonstrate the quantum control of the electron and the nuclear spin of a single 31P atom in silicon, using a continuous microwave magnetic field together with nanoscale electrostatic gates. The qubits are tuned into resonance with the microwave field by a local change in electric field, which induces a Stark shift of the qubit energies. This method, known as A-gate control, preserves the excellent coherence times and gate fidelities of isolated spins, and can be extended to arbitrarily many qubits without requiring multiple microwave sources.

  • Quantum computing
  • Single-atom spin qubits
  • Silicon nanoelectronics
  • Local electrical control
  • Magnetic resonance
  • Phosphorus donor

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