APS March Meeting 2014
Volume 59, Number 1
Monday–Friday, March 3–7, 2014;
Denver, Colorado
Session M32: Invited Session: Semiconductor Qubits
11:15 AM–2:15 PM,
Wednesday, March 5, 2014
Room: 708-712
Sponsoring
Units:
GQI DCMP
Chair: Malcolm Carroll, Sandia National Laboratories
Abstract ID: BAPS.2014.MAR.M32.4
Abstract: M32.00004 : Quantum Computing in Silicon with Donor Electron Spins
1:03 PM–1:39 PM
Preview Abstract
Abstract
Author:
Michelle Simmons
(University of New South Wales)
Extremely long electron and nuclear spin coherence times have recently been
demonstrated in isotopically pure Si-28 [1-3] making silicon one of the most
promising semiconductor materials for spin based quantum information. The
two level spin state of single electrons bound to shallow phosphorus donors
in silicon in particular provide well defined, reproducible qubits [4] and
represent a promising system for a scalable quantum computer in silicon. An
important challenge in these systems is the realisation of an architecture,
where we can position donors within a crystalline environment with approx.
20-50nm separation, individually address each donor, manipulate the electron
spins using ESR techniques and read-out their spin states.
We have developed a unique fabrication strategy for a scalable quantum
computer in silicon using scanning tunneling microscope hydrogen lithography
to precisely position individual P donors in a Si crystal [5] aligned with
nanoscale precision to local control gates [6] necessary to initialize,
manipulate, and read-out the spin states [7]. During this talk I will focus
on demonstrating electronic transport characteristics and single-shot spin
read-out of precisely-positioned P donors in Si. Additionally I will report
on our recent progress in performing single spin rotations by locally
applying oscillating magnetic fields and initial characterization of
transport devices with two and three single donors. The challenges of
scaling up to practical 2D architectures will also be discussed.
\\[4pt]
[1] M. Steger et al., Science 336, 1280 (2012).\\[0pt]
[2] A.M. Tyryshkin et al., Nature Materials 11, 143 (2012). \\[0pt]
[3] K. Saeedi et al., Science 342, 130 (2013).\\[0pt]
[4] B.E. Kane, Nature 393, 133 (1998).\\[0pt]
[5] M. Fuechsle et al., Nature Nanotechnology 7, 242 (2012).\\[0pt]
[6] B. Weber et al., Science 335, 6064 (2012).\\[0pt]
[7] H. Buch et al., Nature Communications 4, 2017 (2011).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2014.MAR.M32.4