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Phys. Rev. A 73, 010301(R) (2006) [4 pages]

Quantum phase-gate operation based on nonlinear optics: Full quantum analysis

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C. Ottaviani, S. Rebi

, D. Vitali, and P. Tombesi
Dipartimento di Fisica, Università di Camerino, I-62032 Camerino (MC), Italy

Rapid

Received 14 July 2005; published 3 January 2006

Wepresent a full quantum treatment of a five-level atomic systemcoupled to two quantum and two classical light fields. Thetwo quantum fields undergo a cross-phase-modulation induced by electromagnetically inducedtransparency. The performance of this configuration as a two-qubit quantumphase gate for traveling single photons is examined. A trade-offbetween the size of the conditional phase shift and thefidelity of the gate is found. Nonetheless, a satisfactory gateperformance is still found to be possible in the transientregime, corresponding to a fast gate operation.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.010301
DOI:	10.1103/PhysRevA.73.010301
PACS:	03.67.Mn; 42.50.-p; 42.65.-k 03.67.Mn Quantum entanglement production, characterization, and manipulation 42.50.-p Quantum optics 42.65.-k Nonlinear optics YEAR: 2006
KEYWORDS:	quantum gates, quantum optics, self-induced transparency

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