Transfer and storage of qubits in the presence of decoherence
Seoul National University, Department of Physics and Astronomy, Center for Theoretical Physics 151-747 Seoul, Korea
Received: 11 March 2013
Accepted: 8 April 2013
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 approximately half a Rabi period and determined by the qubit-qubit coupling strength. Finally, we apply our results to assess the feasibility of a hybrid quantum memory system, comprised of the hyperfine qubit states of an ultracold atomic Bose-Einstein condensate and the flux qubit of a SQUID.
PACS: 03.65.Yz – Decoherence; open systems; quantum statistical methods / 03.67.-a – Quantum information
© EPLA, 2013