• Featured in Physics
  • Editors' Suggestion

Tunable Spin Loading and T1 of a Silicon Spin Qubit Measured by Single-Shot Readout

C. B. Simmons, J. R. Prance, B. J. Van Bael, Teck Seng Koh, Zhan Shi, D. E. Savage, M. G. Lagally, R. Joynt, Mark Friesen, S. N. Coppersmith, and M. A. Eriksson
Phys. Rev. Lett. 106, 156804 – Published 11 April 2011
Physics logo See Viewpoint: Reading a single spin in silicon
PDFHTMLExport Citation

Abstract

We demonstrate single-shot readout of a silicon quantum dot spin qubit, and we measure the spin relaxation time T1. We show that the rate of spin loading can be tuned by an order of magnitude by changing the amplitude of a pulsed-gate voltage, and the fraction of spin-up electrons loaded can also be controlled. This tunability arises because electron spins can be loaded through an orbital excited state. Using a theory that includes excited states of the dot and energy-dependent tunneling, we find that a global fit to the loading rate and spin-up fraction is in good agreement with the data.

  • Figure
  • Figure
  • Figure
  • Received 3 December 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.156804

© 2011 American Physical Society

Viewpoint

Key Image

Reading a single spin in silicon

Published 11 April 2011

Demonstration of one-shot measurement of a single spin on a silicon quantum dot brings the prospect of quantum information processing one step closer.

See more in Physics

Authors & Affiliations

C. B. Simmons, J. R. Prance, B. J. Van Bael, Teck Seng Koh, Zhan Shi, D. E. Savage, M. G. Lagally, R. Joynt, Mark Friesen, S. N. Coppersmith, and M. A. Eriksson

  • Department of Physics, University of Wisconsin–Madison, Madison, Wisconsin 53706, USA

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 106, Iss. 15 — 15 April 2011

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×