IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Entanglement and the quantum brachistochrone problem
Autor/es:
A.BORRAS; C.ZANDER; A.R. PLASTINO; M.CASAS; A.PLASTINO
Revista:
EUROPHYSICS LETTERS
Referencias:
Año: 2008 p. 30007 - 30007
ISSN:
0295-5075
Resumen:
Abstract Entanglement is closely related to some fundamental features of the dynamics of
composite quantum systems: quantum entanglement enhances the speed of evolution of certain
quantum states, as measured by the time required to reach an orthogonal state. The concept of
speed of quantum evolution constitutes an important ingredient in any attempt to determine
the fundamental limits that basic physical laws impose on how fast a physical system can process
or transmit information. Here we explore the relationship between entanglement and the speed of
quantum evolution in the context of the quantum brachistochrone problem. Given an initial and
a final state of a composite system we consider the amount of entanglement associated with the
brachistochrone evolution between those states, showing that entanglement is an essential resource
to achieve the alluded time-optimal quantum evolution. Entanglement is closely related to some fundamental features of the dynamics of
composite quantum systems: quantum entanglement enhances the speed of evolution of certain
quantum states, as measured by the time required to reach an orthogonal state. The concept of
speed of quantum evolution constitutes an important ingredient in any attempt to determine
the fundamental limits that basic physical laws impose on how fast a physical system can process
or transmit information. Here we explore the relationship between entanglement and the speed of
quantum evolution in the context of the quantum brachistochrone problem. Given an initial and
a final state of a composite system we consider the amount of entanglement associated with the
brachistochrone evolution between those states, showing that entanglement is an essential resource
to achieve the alluded time-optimal quantum evolution.