info:eu-repo/semantics/article
Phase-space approach to the study of decoherence in quantum walks
Fecha
2003-11Registro en:
Lopez, Cecilia Carolina; Paz, Juan Pablo; Phase-space approach to the study of decoherence in quantum walks; American Physical Society; Physical Review A: Atomic, Molecular and Optical Physics; 68; 5; 11-2003; 1-9; 52305
1050-2947
CONICET Digital
CONICET
Autor
Lopez, Cecilia Carolina
Paz, Juan Pablo
Resumen
We analyze the quantum walk on a cycle using discrete Wigner functions as a way to represent the states and the evolution of the walker. The method provides some insight on the nature of the interference effects that make quantum and classical walks different. We also study the behavior of the system when the quantum coin carried by the walker interacts with an environment. We show that for this system quantum coherence is robust for initially delocalized states of the walker. The use of phase-space representation enables us to develop an intuitive description of the nature of the decoherence process in this system.