Valley-Based Noise-Resistant Quantum Computation Using Si Quantum Dots

Dimitrie Culcer, A. L. Saraiva, Belita Koiller, Xuedong Hu, and S. Das Sarma
Phys. Rev. Lett. 108, 126804 – Published 20 March 2012
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Abstract

We devise a platform for noise-resistant quantum computing using the valley degree of freedom of Si quantum dots. The qubit is encoded in two polarized (1,1) spin-triplet states with different valley compositions in a double quantum dot, with a Zeeman field enabling unambiguous initialization. A top gate gives a difference in the valley splitting between the dots, allowing controllable interdot tunneling between opposite valley eigenstates, which enables one-qubit rotations. Two-qubit operations rely on a stripline resonator, and readout on charge sensing. Sensitivity to charge and spin fluctuations is determined by intervalley processes and is greatly reduced as compared to conventional spin and charge qubits. We describe a valley echo for further noise suppression.

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  • Received 6 July 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.126804

© 2012 American Physical Society

Authors & Affiliations

Dimitrie Culcer1, A. L. Saraiva2, Belita Koiller2, Xuedong Hu3, and S. Das Sarma4

  • 1ICQD, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 2Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21941-972 Rio de Janeiro, Brazil
  • 3Department of Physics, University at Buffalo, SUNY, Buffalo, New York 14260-1500, USA
  • 4Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA

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Issue

Vol. 108, Iss. 12 — 23 March 2012

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