Frontiers of quantum physics

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Entanglement Generation from Thermal Spin States via Unitary Beam Splitters

(2003)

Authors:

D Markham, M Murao, V Vedral
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Spin-1/2 geometric phase driven by decohering quantum fields

(2003)

Authors:

A Carollo, I Fuentes-Guridi, M Franca Santos, V Vedral
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Accessibility of physical states and non-uniqueness of entanglement measure

(2003)

Authors:

Fumiaki Morikoshi, Marcelo Franca Santos, Vlatko Vedral
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Geometric phase in open systems.

Phys Rev Lett 90:16 (2003) 160402

Authors:

A Carollo, I Fuentes-Guridi, M França Santos, V Vedral

Abstract:

We calculate the geometric phase associated with the evolution of a system subjected to decoherence through a quantum-jump approach. The method is general and can be applied to many different physical systems. As examples, two main sources of decoherence are considered: dephasing and spontaneous decay. We show that the geometric phase is completely insensitive to the former, i.e., it is independent of the number of jumps determined by the dephasing operator.
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Vacuum induced Berry phase: Theory and experimental proposal

Journal of Modern Optics 50:6-7 (2003) 1175-1181

Authors:

S Bose, A Carollo, I Fuentes-Guridi, MF Santos, V Vedral

Abstract:

We investigate quantum effects in geometric phases arising when a two-level system is interacting with a quantized electromagnetic field. When the system is adiabatically driven along a closed loop in the parameter space, signatures of the field quantization are observable in the geometric phase. We propose a feasible experiment to measure these effects in cavity QED and also analyse the semi-classical limit, recovering the usual Berry phase results.
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