Heralded Storage of a Photonic Quantum Bit in a Single Atom

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Date: 
2015-06-02
Author(s): 

Norbert Kalb, Andreas Reiserer, Stephan Ritter, Gerhard Rempe

Reference: 

Phys. Rev. Lett. 114, 220501 (2015)

Combining techniques of cavity quantum electrodynamics, quantum measurement, and quantum feedback, we have realized the heralded transfer of a polarization qubit from a photon onto a single atom with 39% efficiency and 86% fidelity. The reverse process, namely, qubit transfer from the atom onto a given photon, is demonstrated with 88% fidelity and an estimated efficiency of up to 69%. In contrast to previous work based on two-photon interference, our scheme is robust against photon arrival-time jitter and achieves much higher efficiencies. Thus, it constitutes a key step toward the implementation of a long-distance quantum network.