Bulletin of the American Physical Society
APS March Meeting 2013
Volume 58, Number 1
Monday–Friday, March 18–22, 2013; Baltimore, Maryland
Session B1: Invited Session: Logical Spin Qubits for Quantum Computation
11:15 AM–2:15 PM,
Monday, March 18, 2013
Room: Ballroom I
Sponsoring Unit: DCMP
Chair: Amir Yacoby, Harvard University
Abstract ID: BAPS.2013.MAR.B1.5
Abstract: B1.00005 : Two single spin qubits with universal control and control of spin entanglement with exchange coupling*
1:39 PM–2:15 PM
Preview Abstract Abstract
(The University of Tokyo)
Single qubits and two-qubit gates are building blocks to prepare a universal set of logical operations. We use a micro-magnet technique to implement single spin qubits with individual quantum dots and two-qubit gates with inter-dot exchange coupling. I will talk about our recent experiments of a combined X-gate and exchange control to modulate and detect the degree of spin singlet coupling. The gate fidelity is restricted by X-gate operation time and fidelity. The X-gate is prepared by oscillating an electron inside a quantum dot with microwave (MW) in the presence of a micro-magnet induced field gradient. We have recently raised the MW power and optimized the magnet design to reduce the X-gate time $<$ 3 nsec with improved gate fidelity much shorter than the dephasing time. We have also developed a technique to use the micro-magnet induced inhomogeneous Zeeman field to make faste Z-gate and CPHASE.
*We acknowledge the Funding Program for World-Leading Innovative R\&D on Science and Technology (FIRST), and the IARPA project ``Multi-Qubit Coherent Operations'' through Copenhagen University.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2013.MAR.B1.5
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