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APS » Journals » Phys. Rev. Lett. » Volume 94 » Issue 4
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Phys. Rev. Lett. 94, 040507 (2005) [4 pages]

Fault-Tolerant Quantum Computation via Exchange Interactions

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Masoud Mohseni1 and Daniel A. Lidar2
1Department of Physics and Center for Quantum Information and Quantum Control, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7
2Chemical Physical Theory Group, Chemistry Department, and Center for Quantum Information and Quantum Control, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6

Received 25 June 2004; published 3 February 2005

Quantum computation can be performed by encoding logical qubits into the states of two or more physical qubits, and control of effective exchange interactions and possibly a global magnetic field. This “encoded universality” paradigm offers potential simplifications in quantum computer design since it does away with the need to control physical qubits individually. Here we show how encoded universality schemes can be combined with fault-tolerant quantum error correction, thus establishing the scalability of such schemes.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.040507
DOI:
10.1103/PhysRevLett.94.040507
PACS:
03.67.Lx, 03.65.Yz, 03.67.Pp
 
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