Arbitrary state controlled-unitary gate by adiabatic passage

Journal Article · Sat Apr 15 00:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.73.0· OSTI ID:20787094

Lacour, X; Guerin, S; Jauslin, H R ^[1]; Sangouard, N ^[2]

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1. Laboratoire de Physique, Universite de Bourgogne, UMR CNRS 5027, Boite Postale 47870, 21078 Dijon Cedex (France)
2. Fachbereich Physik, Universitaet Kaiserslautern, 67653, Kaiserslautern (Germany)

We propose a fast scheme involving atoms fixed in an optical cavity to directly implement the universal controlled-unitary gate. The present technique based on adiabatic passage uses dark states well suited for the controlled-rotation operation. We show that these dark states allow the robust implementation of a gate that is a generalization of the controlled-unitary gate to the case where the control qubit can be selected to be an arbitrary state. This gate has potential applications to the rapid implementation of quantum algorithms such as the projective measurement algorithm. This process is decoherence-free since excited atomic states and cavity modes are not populated during the dynamics.

• OSTI ID: 20787094
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 73; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ALGORITHMS
ATOMS
CONTROL
EXCITED STATES
GATING CIRCUITS
QUANTUM MECHANICS
QUBITS
ROTATION