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.

Authors
K. Eckert, M. Lewenstein, G. Birkl, D. Bruss, J. Schliemann, X. X. Yi, i J. Mompart
Citation Key
PhysRevA.66.042317
COinS Data

Date Published
2015-04-14 02:51
DOI
10.1103/PhysRevA.66.042317
Pagination
042317
Publisher
American Physical Society
Journal
Phys. Rev. A
URL
http://link.aps.org/doi/10.1103/PhysRevA.66.042317
Volume
66
Year of Publication
2002