Scheme for a spin-based quantum computer employing induction detection and imaging

TL;DR

This paper proposes a theoretical scheme for a scalable, spin-based quantum computer using phosphorus-doped silicon, combining electron and nuclear spins with advanced resonance and imaging techniques for quantum computation.

Contribution

It introduces a novel, scalable quantum computing scheme utilizing induction detection and imaging with phosphorus-doped silicon and combined ESR/NMR techniques.

Findings

Scheme is scalable to hundreds of qubits

Uses high-sensitivity induction detection for parallel readout

Employs combined ESR and NMR techniques at cryogenic temperatures

Abstract

A theoretical spin-based scheme for performing a variety of quantum computations is presented. It makes use of an array of multiple identical computer vectors of phosphorus-doped silicon where the nuclei serve as logical qubits and the electrons as working qubits. The spins are addressed by a combination of electron spin resonance and nuclear magnetic resonance techniques operating at a field of ~3.3 T and cryogenic temperatures with an ultra-sensitive surface microresonator. Spin initialization is invoked by a combination of strong pre-polarization fields and laser pulses, which shortens the electrons' T1. The set of universal quantum gates for this system includes an arbitrary rotation of single qubits and c-NOT operation in two qubits. The efficient parallel readout of all the spins in the system is performed by high sensitivity induction detection of the electron spin resonance signals with one-dimensional imaging. Details of the suggested scheme are provided, which show that it is scalable to a few hundreds of qubits.