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A single-atom electron spin qubit in silicon.

Jarryd J Pla1, Kuan Y Tan, Juan P Dehollain

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Researchers demonstrate coherent manipulation of an individual electron spin qubit in silicon. This breakthrough in quantum computing utilizes a single phosphorus atom, paving the way for scalable quantum processors.

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Area of Science:

  • Quantum Computing
  • Atomic Physics
  • Solid-State Physics

Background:

  • Single atoms are ideal quantum systems for quantum bits (qubits).
  • Previous qubit implementations include electromagnetic traps and nitrogen-vacancy centers in diamond.
  • Scaling quantum processors requires integrating atomic qubits with electrical devices.

Purpose of the Study:

  • To demonstrate coherent manipulation of an individual electron spin qubit bound to a phosphorus atom in silicon.
  • To achieve electrical readout of the qubit state.
  • To assess the potential for scalable quantum computing architectures.

Main Methods:

  • Utilized electron spin resonance (ESR) to drive Rabi oscillations.
  • Employed a Hahn echo pulse sequence to measure spin coherence time.
  • Developed a device architecture compatible with integrated circuit technology for electrical readout.

Main Results:

  • Demonstrated coherent manipulation of a single electron spin qubit in natural silicon.
  • Achieved single-shot electrical readout of the qubit.
  • Measured a spin coherence time exceeding 200 microseconds, with potential for longer times in enriched silicon.

Conclusions:

  • The electron spin of a single phosphorus atom in silicon is a promising platform for scalable quantum computing.
  • Electrical measurement and coherent control have been successfully combined.
  • This approach offers compatibility with existing integrated circuit technology.