Scalable quantum computing with magnetically interacting atoms

Andrei Derevianko
Physics Department, University of Nevada, Reno

Friday, 14 January 2005
11:00 am, Pratt Conference Room
Harvard-Smithsonian Center for Astrophysics

Abstract:

Considering recent success in cooling and trapping of open shell
atoms with large magnetic moments, we propose a quantum computer
based on magnetic interactions of such atoms. This architecture is
based on cold atoms confined to sites of a tight optical lattice.
The lattice is placed in a non-uniform magnetic field and the
resulting Zeeman sublevels define qubit states. Microwave pulses
tuned to space-dependent resonant frequencies are used for
individual addressing. The atoms interact via magnetic-dipole
interactions allowing implementation of a universal controlled-NOT
gate. The resulting gate operation times are as fast as 100
microseconds, much faster then the anticipated decoherence times.
Single qubit operations take about 10 microseconds.

Details can be found in
A. Derevianko and C. Cannon,  Phys. Rev. A 70, 062319 (2004).