Thursday, July 4, 2013

1307.0963 (Kelly R. Patton et al.)

Ultrafast quantum random access memory utilizing single Rydberg atoms in
a Bose-Einstein condensate

Kelly R. Patton, Uwe R. Fischer
We propose a long-lived and rapidly accessible quantum memory unit, where the qubit Hilbert space is spanned by states involving the macroscopically occupied hyperfine levels of a miscible binary atomic Bose-Einstein condensate and the Rydberg state of an atom. It is shown that an arbitrary qubit state, initially prepared using a flux qubit, can be rapidly transferred to and from the trapped atomic ensemble in approximately 10 ns and with a large fidelity of 97 %, via a two-photon process involving an external laser. The achievable ultrafast transfer of quantum information therefore enables a large number of storage and retrieval cycles from the highly controllable quantum optics setup of a dilute ultracold gas, even within the typically very short flux qubit lifetimes of the order of microseconds.
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