One- and two-dimensional quantum walks in arrays of optical traps
Eckert, Kai (University of Hannover. Institute of Theoretical Physics)
Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Birkl, Gerhard (Universität Darmstadt. Institut für Angewandte Physik, Technische)
Lewenstein, Maciej (University of Hannover. Institute of Theoretical Physics)
American Physical Society

Data:	2005
Resum:	We propose a different implementation of discrete-time quantum walks for a neutral atom in an array of optical microtraps or an optical lattice. We analyze a one-dimensional walk in position space, with the coin, the additional qubit degree of freedom that controls the displacement of the quantum walker, implemented as a spatially delocalized qubit, i. e. , the coin is also encoded in position space. We analyze the dependence of the quantum walk on temperature and experimental imperfections such as shaking in the trap positions. Finally, combining a spatially delocalized qubit and a hyperfine qubit, we also give a scheme to realize a quantum walk on a two-dimensional square lattice with the possibility of implementing different coin operators.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Physical review. A, Vol. 72, Issue 1 (July 2005) , p. 012327-1-012327-9, ISSN 1050-2947

DOI: 10.1103/PhysRevA.72.012327

9 p, 817.9 KB

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