A single-atom electron spin qubit in silicon

Abstract

A single atom is the prototypical quantum system, and a natural candidate for a quantum bit - the elementary unit of a quantum computer. Atoms have been successfully used to store and process quantum information in electromagnetic traps, as well as in diamond through the use of the NV-center point defect. Solid state electrical devices possess great potential to scale up such demonstrations from few-qubit control to larger scale quantum processors. In this direction, coherent control of spin qubits has been achieved in lithographically-defined double quantum dots in both GaAs and Si. However, it is a formidable challenge to combine the electrical measurement capabilities of engineered nanostructures with the benefits inherent to 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 readout. We use electron spin resonance to drive Rabi oscillations, while a Hahn echo pulse sequence reveals a spin coherence time (T2) exceeding 200 μs. This figure is expected to become even longer in isotopically enriched 28Si samples. Together with the use of a device architecture that is compatible with modern integrated circuit technology, these results indicate that the electron spin of a single phosphorus atom in silicon is an excellent platform on which to build a scalable quantum computer.

13 pages, 4 figures

References in corpus (12)

• Single-shot read-out of an individual electron spin in a quantum dot
• Driven coherent oscillations of a single electron spin in a quantum dot
• Coherent control of a single electron spin with electric fields
• Optimized Dynamical Decoupling in a Model Quantum Memory
• Solid state quantum memory using the 31P nuclear spin
• Decoherence-protected quantum gates for a hybrid solid-state spin register
• Electron spin decoherence in isotope-enriched silicon
• Pair-wise decoherence in coupled spin qubit networks
• Architecture for high-sensitivity single-shot readout and control of the electron spin of individual donors in silicon
• Stark Tuning of Donor Electron Spins in Silicon
• Nanoscale broadband transmission lines for spin qubit control
• Dynamical Decoupling in the Presence of Realistic Pulse Errors

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