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APS » Journals » Phys. Rev. Lett. » Volume 83 » Issue 2
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Phys. Rev. Lett. 83, 432–435 (1999)

Spin Flips and Quantum Information for Antiparallel Spins

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N. Gisin1 and S. Popescu2,3
1Group of Applied Physics, University of Geneva, 1211 Geneva 4, Switzerland
2Isaac Newton Institute, University of Cambridge, 20 Clarkson Road, Cambridge, CB3 0EH, United Kingdom
3BRIMS Hewlett Packard Labs, Bristol, United Kingdom

Received 26 January 1999; published in the issue dated 12 July 1999

See accompanying Physics Focus

We consider two different ways to encode quantum information, by parallel or antiparallel pairs of spins. We find that there is more information in the antiparallel ones. This purely quantum mechanical effect is due to entanglement, not of the states but occurring in the course of the measuring process. We also introduce a range of quantum information processing machines, such as spin flip and anticloning.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.432
DOI:
10.1103/PhysRevLett.83.432
PACS:
03.67.-a, 03.65.Bz
 
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