Quantum computing in optical microtraps based on the motional states of neutral atoms
Eckert, Kai (University of Hannover. Institute of Theoretical Physics)
Mompart Penina, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Yi, X. X. (University of Hannover. Institute of Theoretical Physics)
Schliemann, J. (University of Basel. Department of Physics and Astronomy)
Bruß, Dagmar (University of Hannover. Institute of Theoretical Physics)
Birkl, Gerhard (University of Hannover. Institute of Quantum Optics)
Lewenstein, Maciej (University of Hannover. Institute of Theoretical Physics)
American Physical Society

Date:	2002
Abstract:	We investigate quantum computation with neutral atoms in optical microtraps where the qubit is implemented in the motional states of the atoms, i. e. , in the two lowest vibrational states of each trap. The quantum gate operation is performed by adiabatically approaching two traps and allowing tunneling and cold collisions to take place. We demonstrate the capability of this scheme to realize a square root of swap gate, and address the problem of double occupation and excitation to other unwanted states. We expand the two-particle wave function in an orthonormal basis and analyze quantum correlations throughout the whole gate process. Fidelity of the gate operation is evaluated as a function of the degree of adiabaticity in moving the traps. Simulations are based on rubidium atoms in state-of-the-art optical microtraps with quantum gate realizations in the few tens of milliseconds duration range.
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Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Physical review. A, Vol. 66, Issue 4 (October 2002) , p. 042317-1-042317-11, ISSN 1050-2947

DOI: 10.1103/PhysRevA.66.042317

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