Bulletin of the American Physical Society
APS March Meeting 2015
Volume 60, Number 1
Monday–Friday, March 2–6, 2015; San Antonio, Texas
Session G37: Focus Session: Semiconductor Qubits - SiGe, Isotopic Purification, and Electrical Control
11:15 AM–2:15 PM,
Tuesday, March 3, 2015
Sponsoring Unit: GQI
Chair: Andrea Morello, University of New South Wales
Abstract ID: BAPS.2015.MAR.G37.6
Abstract: G37.00006 : Entangling multi-dot spin qubits*
12:39 PM–12:51 PM
Preview Abstract Abstract
(Laboratory for Physical Sciences/University of Maryland, College Park, MD)
(Joint Center for Quantum Information and Computer Science/Joint Quantum Institute/ National Institute of Standards and Technology, Gaithersburg, MD)
(Laboratory for Physical Sciences, College Park, MD)
Single quantum bits encoded in the spins of two or three electrons confined within multiple semiconductor quantum dots provide practical advantages over individual electron spin qubits, in terms of both faster control via applied electric fields and protection from collective decoherence mechanisms. However, implementing rapid and robust entangling gates between these multi-electron, multi-dot qubits remains a current challenge. While the exchange interaction gives rise to rapid gates, it is limited in range and requires accompanying methods for suppressing leakage. Alternatively, the long-range Coulomb interaction can be used to couple both adjacent and spatially separated qubits, and rapid gates are possible through microwave manipulation of the extended charge distribution associated with a multi-dot system. We theoretically investigate different approaches for entangling qubits in double  and triple dots. By analyzing the coupling in the presence of charge noise and relaxation, we identify optimal regimes of operation for two-qubit gates and compare their performance for GaAs and Si quantum dots. \\[4pt]  V. Srinivasa and J. M. Taylor, arXiv:1408.4740 (2014).
*Support from DARPA MTO and the NSF-funded Physics Frontier Center at the JQI is gratefully acknowledged.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2015.MAR.G37.6
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700