Kelly R. Patton, Uwe R. Fischer
The effects of decoherence on the transfer and storage of coherent quantum states in hybrid systems are studied within the Caldeira-Leggett approach. In general, we find that a high transfer fidelity can be achieved even if the decoherence time is less than an order of magnitude larger than the transfer time, which is of order half a Rabi period and determined by the qubit-qubit coupling strength. We finally apply our results to assess the feasibility of a novel hybrid quantum memory system, comprised of the hyperfine qubit states of an ultracold atomic Bose-Einstein condensate and the flux qubits of a SQUID.
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http://arxiv.org/abs/1212.5219
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