Publication: Quantum processing photonic states in optical lattices
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American Physical Society
The mapping of photonic states to collective excitations of atomic ensembles is a powerful tool which finds a useful application in the realization of quantum memories and quantum repeaters. In this work we show that cold atoms in optical lattices can be used to perform an entangling unitary operation on the transferred atomic excitations. After the release of the quantum atomic state, our protocol results in a deterministic two qubit gate for photons. The proposed scheme is feasible with current experimental techniques and robust against the dominant sources of noise.
© 2008 The American Physical Society. We thank Eugene Polzik for discussions and acknowledge support from the Elite Network of Bavaria (ENB) project QCCC, the EU projects SCALA and COVAQUIAL, the DFG-Forschungsgruppe No. 635, and Ministerio de Educacion y Ciencia No. EX-2006-0295.