Electrically controlling single-spin qubits in a continuous microwave field.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 26601166.
- Also identified by DOI 10.1126/sciadv.1500022 and PMC identifier 4640634.
- Licence recorded as CC BY-NC.
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Abstract
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 (31)P 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.