A single-atom electron spin qubit in silicon

Jarryd J. Pla*, Kuan Y. Tan, Juan P. Dehollain, Wee H. Lim, John J. L. Morton, David N. Jamieson, Andrew S. Dzurak, Andrea Morello

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

482 Citations (Scopus)

Abstract

A single atom is the prototypical quantum system, and a natural candidate for a quantum bit, or qubit-the elementary unit of a quantum computer. Atoms have been successfully used to store and process quantum information in electromagnetic traps(1), as well as in diamond through the use of the nitrogen-vacancy-centre point defect(2). Solid-state electrical devices possess great potential to scale up such demonstrations from few-qubit control to larger-scale quantum processors. Coherent control of spin qubits has been achieved in lithographically defined double quantum dots in both GaAs (refs 3-5) and Si (ref. 6). However, it is a formidable challenge to combine the electrical measurement capabilities of engineered nanostructures with the benefits inherent in atomic spin qubits. Here we demonstrate the coherent manipulation of an individual electron spin qubit bound to a phosphorus donor atom in natural silicon, measured electrically via single-shot read-out(7-9). We use electron spin resonance to drive Rabi oscillations, and a Hahn echo pulse sequence reveals a spin coherence time exceeding 200 mu s. This time should be even longer in isotopically enriched Si-28 samples(10,11). Combined with a device architecture(12) that is compatible with modern integrated circuit technology, the electron spin of a single phosphorus atom in silicon should be an excellent platform on which to build a scalable quantum computer.

Original languageEnglish
Pages (from-to)541-545
Number of pages5
JournalNature
Volume489
Issue number7417
DOIs
Publication statusPublished - 27 Sep 2012
MoE publication typeA1 Journal article-refereed

Keywords

  • QUANTUM-DOT
  • NUCLEAR-SPIN
  • OSCILLATIONS
  • TRANSISTOR
  • COHERENCE
  • RESONANCE
  • MEMORY
  • GATES

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