Published on *QUROPE* (http://qurope.eu)

Tue, 2015-06-02 21:23 - Stephan Ritter [1]

Date:

2015-06-02

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.

**Links:**

[1] http://qurope.eu/users/ritter

[2] http://dx.doi.org/10.1103/PhysRevLett.114.220501

[3] http://qurope.eu/category/qics/00-quantum-information-science/01-physics-and-information-science/0110i-encoding-proce

[4] http://qurope.eu/category/qics/30-quantum-networks/32-quantum-repeaters/3220m-quantum-memoriesstorage-qubits

[5] http://qurope.eu/category/qics/30-quantum-networks/33-qubit-interfaces/3310a-cavity-qed-atoms-or-ions

[6] http://qurope.eu/category/qipc/qipc

[7] http://qurope.eu/category/projects/ips/siqs

[8] http://qurope.eu/category/qics/10-quantum-computation/15-implementations-quantum-optics/1510ne-neutral-atoms-electron

[9] http://qurope.eu/category/qics/10-quantum-computation/15-implementations-quantum-optics/1510ph-photons

[10] http://qurope.eu/category/qics/10-quantum-computation/15-implementations-quantum-optics/1520%E2%80%93e-quantum-optics-experim

[11] http://qurope.eu/category/qics/10-quantum-computation/15-implementations-quantum-optics/1520ca-cavity-qed