Entity:UAM. Departamento de Física Teórica de la Materia Condensada
Publisher:The American Physical Society
Date:2011-12-05
Citation:
10.1103/PhysRevB.84.235306
Physycal Review B 84.23 (2011): 235306
ISSN:1098-0121 (print); 1550-235X (online)
DOI:10.1103/PhysRevB.84.235306
Funded by:Work supported by the Spanish MICINN (MAT2008- 01555, MAT2008-06609-C02, CSD2006-00019-QOIT, and CSD2007-046-NanoLight.es) and CAM (S-2009/ESP-1503).
D.M.-C. and A.G.-T acknowledge FPU grants (AP2007-00891 and AP2008-00101, respectively) from the Spanish Ministry of Education
Project:Comunidad de Madrid. S2009/ESP-1503/Q&CLIGHT
We study the generation of entanglement between two distant qubits mediated by the surface plasmons of a metallic waveguide. We show that a V-shaped channel milled in a flat metallic surface is much more efficient for this purpose than a metallic cylinder. The role of the misalignments of the dipole moments of the qubits, an aspect of great importance for experimental implementations, is also studied. A careful analysis of the quantum dynamics of the system bymeans of a master equation shows that two-qubit entanglement generation is essentially due to the dissipative part of the effective qubit-qubit coupling provided by the surface plasmons. The influence of a coherent external pumping, needed to achieve a steady-state entanglement, is discussed. Finally, we pay
attention to the question of how to get information experimentally on the degree of entanglement achieved in the system