Solid State Quantum Computer in Silicon

Abstract

A Si:P electron-spin qubit architecture was developed in 2008, based upon research outcomes over the four-year QCCM grant. Single-shot spin readout will proceed via spin-dependent tunneling to a Si MOS rf-SET, which we have demonstrated to posses charge sensitivities equal to or better than Al rf-SETs. Spin manipulation will occur using local electron-spin resonance (ESR), which we have used to observe hyperfine-split electron spin resonances in P-doped Si MOSFETs. This spin qubit concept has been incorporated into the bi-linear array quantum computer design developed in parallel over 2004-2008 by the theory programs, which was one of the first quantum computer architectures quantitatively analyzed for the fault-tolerant threshold. Preliminary measurements on ion-implanted spin qubit devices have demonstrated transfer of P-donor electrons to a Si-SET detector with a large signal of ~0.2e, while tunneling structures have enabled transport spectroscopy of singly occupied (D0) and doubly occupied (D-) P-donor electron states. These measurements are strongly supported by the NEMO-TCAD program allowing donor species and position to be determined through transport spectroscopy. Single-ion implantation using on-chip PIN detectors now routinely produces Si:P devices with accurately positioned single donors, such as a 2-P-atom charge qubit device, in which electron transfer events and charge-state relaxation times have been measured. Using STM atom-scale lithography the narrowest conducting doped wires in silicon have been demonstrated and used to fabricate the first in-plane-gated dot architecture. Measurements of these dots highlight the stability of in-plane gates compared with top gates and provide a pathway to atomically precise single donor architectures. Ab-initio and self-consistent tight-binding approaches have made progress in describing the essential physics of these highlydoped nanostructures.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 30, 2008
Accession Number
ADA499325

Entities

People

  • Andrew S. Dzurak
  • D. N. Jamieson
  • J. C. Mccallum
  • L. C. Hollenberg
  • M. Y. Simmons
  • R. G. Clark
  • S. Prawer

Organizations

  • University of New South Wales

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Band Gaps
  • Detection
  • Electronics Industry
  • Electronics Laboratories
  • Energy Bands
  • Field Effect Transistors
  • Information Processing
  • Magnetic Resonance
  • Materials Science
  • Nanoscale Devices
  • Nanotechnology
  • Quantum Computing
  • Quantum Information
  • Scattering
  • Semiconductors
  • Spectra
  • Systems Engineering

Fields of Study

  • Physics

Readers

  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.

Technology Areas

  • Microelectronics
  • Quantum Computing
  • Quantum Science - Quantum Dots