Cavity QED quantum phase gates for a single longitudinal mode of the intracavity field
García Maraver, Rocío (Universitat Autònoma de Barcelona. Departament de Física)
Corbalán, R. (Ramón) (Universitat Autònoma de Barcelona. Departament de Física)
Eckert, Kai (University of Hannover. Institut of Theoretical Physics)
Rebic, S. (Università di Camerino. Dipartimento di Fisica)
Artoni, Maurizio (European Laboratory for Non-Linear Spectroscopy (Sesto Fiorentino, Itàlia))
Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
American Physical Society

Data:	2004
Resum:	A single three-level atom driven by a longitudinal mode of a high-Q cavity is used to implement two-qubit quantum phase gates for the intracavity field. The two qubits are associated with the zero- and one-photon Fock states of each of the two opposite circular polarization states of the field. The three-level atom mediates the conditional phase gate provided the two polarization states and the atom interact in a V-type configuration and the two-photon resonance condition is satisfied. Microwave and optical implementations are discussed with gate fidelities being evaluated against several decoherence mechanisms such as atomic velocity fluctuations or the presence of a weak magnetic field. The use of coherent states for both polarization states is investigated to assess the entanglement capability of the proposed quantum gates.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Physical review. A, Vol. 70, Issue 6 (December 2004) , p. 062324-1-062324-6, ISSN 1050-2947

DOI: 10.1103/PhysRevA.70.062324

6 p, 89.7 KB

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