We are building a quantum computation experiment based on a 4.9 micron spaced optical lattice. We have shown that atoms in this lattice can independently observed and addressed, so that each functions as a qubit, the fundamental unit of quantum information. We are pursuing ways to quantum mechanically entangle these qubits, also in a site addressable way. Such a system holds the long term promise of thousands of physical qubits, with decoherence times as large as 10^{5} times the gate time.

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J. Vala, K. B. Whaley and D. S. Weiss, "Quantum error correction of a qubit loss in an addressable atomic system," Phys. Rev. A **72**, 052318 (2005)

J. Vala, A. V. Thapliyal, S. Myrgren, U. Vazirani, D. S. Weiss and K. B. Whaley, "Perfect pattern formation of neutral atoms in an addressable optical lattice," Phys. Rev. A **71**, 032324 (2005)

D. S. Weiss, J. Vala, A. V. Thapliyal, S. Myrgren, U. Vazirani and K. B. Whaley, "Another way to approach zero entropy for a finite system of atoms," Phys. Rev. A **70**, 040302(R) (2004)

*Interacting atoms in optical lattices*, National Science Foundation*Optical Lattice Emulation*, Defense Advanced Research Projects Agency*Topological Quantum Information in a 3D Neutral Atom Array*, Defense Advanced Research Projects Agency DARPA QuEST

Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.