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APS » Journals » Phys. Rev. Lett. » Volume 94 » Issue 23
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Phys. Rev. Lett. 94, 236803 (2005) [4 pages]

Solid-State Circuit for Spin Entanglement Generation and Purification

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J. M. Taylor1, W. Dür2,3, P. Zoller2,3, A. Yacoby1,4, C. M. Marcus1, and M. D. Lukin1
1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
2Institut für Theoretische Physik, Universität Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria
3Institut für Quantenoptik und Quanteninformation der Österreichischen Akademie der Wissenschaften, Innsbruck, Austria
4Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel

Received 10 March 2005; published 15 June 2005

We show how realistic charge manipulation and measurement techniques, combined with the exchange interaction, allow for the robust generation and purification of four-particle spin entangled states in electrically controlled semiconductor quantum dots. The generated states are immunized to the dominant sources of noise via a dynamical decoherence-free subspace; all additional errors are corrected by a purification protocol. This approach may find application in quantum computation, communication, and metrology.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.236803
DOI:
10.1103/PhysRevLett.94.236803
PACS:
73.63.Kv, 03.67.Mn, 03.67.Pp
 
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