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Science 22 July 2005:
Vol. 309. no. 5734, pp. 565 - 567
DOI: 10.1126/science.1115256
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Perspectives

PHYSICS:
Fingerprinting Spin Qubits

J. Carlos Egues

Electrons not only have mass and charge, they also have magnetic properties directly related to their intrinsic spin. These spins can combine into quantum states of different spin parity, and such states may be useful as qubits in future quantum computers. As Egues discusses in his Perspective, Engel and Loss report in this issue a method for "fingerprinting" the spin states of electrons contained in quantum dot structures. By allowing the electrons to leak from one dot to another, and then using a nanowire to sense the presence of the spin states, the authors were able to perform a nondestructive spin-parity measurement. Such a spin-parity detector should permit the manipulation of quantum dot qubits for quantum computation.

The author is in the Department of Physics and Informatics, Institute of Physics of São Carlos, University of São Paulo, São Carlos 13560-970, Brazil. E-mail: egues{at}if.sc.usp.br

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Science. ISSN 0036-8075 (print), 1095-9203 (online)