Quantum Information Seminar Series

Quantum Computation in Bad Cavities

Dr. Anders Søndberg Sørensen
ITAMP
Harvard University

Optical cavities was one of the first proposal for the construction of a quantum computer, but progress in this direction has been slow because all existing proposals require the cavity to be operating in the strong coupling limit, which is hard to achieve experimentally. I will present a scheme for a quantum computer using optical cavities which are not in the strong coupling regime.

The fundamental building block of our scheme is a probabilistic gate which entangles two atoms conditioned on the outcome of a measurement. I will show that for some suitable atoms, e.g. Mg or Al+, the quantum information can be stored in the nuclear spin of the atoms, while the probabilistic gate entangles the electronic degrees of freedom. Because the nuclear spin can be completely decoupled from the electronic state, the quantum information is unaffected by a failure of the probabilistic gate, and the gate can be repeated until it is successful. Once the gate is successful the generated entanglement, can be used to implement a gate between nuclear spins with certainty.

Tuesday, November 26, 2002
2:00 PM
Gant Science Complex
Physics Department
Room P121


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