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APS » Journals » Phys. Rev. Lett. » Volume 87 » Issue 3
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Phys. Rev. Lett. 87, 037901 (2001) [4 pages]

Dipole Blockade and Quantum Information Processing in Mesoscopic Atomic Ensembles

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M. D. Lukin1, M. Fleischhauer1,2, and R. Cote3
1ITAMP, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138
2Fachbereich Physik, Universität Kaiserslautern, D-67663 Kaiserslautern, Germany
3Physics Department, University of Connecticut, Storrs, Connecticut 06269

L. M. Duan, D. Jaksch, J. I. Cirac, and P. Zoller
Institut für Theoretische Physik, Universität Innsbruck, A-6020 Innsbruck, Austria

Received 7 November 2000; published 26 June 2001

We describe a technique for manipulating quantum information stored in collective states of mesoscopic ensembles. Quantum processing is accomplished by optical excitation into states with strong dipole-dipole interactions. The resulting “dipole blockade” can be used to inhibit transitions into all but singly excited collective states. This can be employed for a controlled generation of collective atomic spin states as well as nonclassical photonic states and for scalable quantum logic gates. An example involving a cold Rydberg gas is analyzed.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.037901
DOI:
10.1103/PhysRevLett.87.037901
PACS:
03.67.Lx, 03.75.Fi, 42.50.Gy, 73.23.-b
 
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