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International Conference on Quantum Information

Remote preparation of a single atom quantum memory

M. Weber, Stefan Berner, Wenjamin Rosenfeld, Jürgen Volz, Harald Weinfurter

Published Jan 1, 2007• 0 citations
Publisher

Abstract

Here, using atom-photon entanglement, we experimentally demonstrate the preparation of a distant single atom quantum memory via a quantum teleportation protocol. We evaluated the performance by a full tomography of the prepared atomic state.
DOI
10.1364/icqi.2007.iff3

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We demonstrate teleportation of quantum bits between two single atoms in distant laboratories. Using a time-resolved photonic Bell-state measurement, we achieve a teleportation fidelity of (88.0 ± 1.5)%, largely determined by our entanglement fidelity. The low photon collection efficiency in free space is overcome by trapping each atom in an optical cavity. The resulting success probability of 0.1% is almost 5 orders of magnitude larger than in previous experiments with remote material qubits. It is mainly limited by photon propagation and detection losses and can be enhanced with a cavity-based deterministic Bell-state measurement.
Entanglement of distant quantum memories forms the building block of quantum networks. Neutral atoms with long coherence times are sought for candidates for quantum network links (QNLs). Our experiment with two nodes, 400 m apart, employs single optically trapped Rubidium-87 atoms as quantum memories. Via excitations, entanglement between the atom and spontaneously emitted single photons is created in both traps. Using single-mode fibers, the photons are interfered in a Bell-state measurement thereby swapping the entanglement from the two atom-photon pairs to the atoms with a projective measurement. A new collection setup [1] allows for an increased entanglement event rate of ∼1/20 Hz allowing detailed state analysis and reconstruction of the entangled state.