Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 54: Quantum Information (Quantum Repeater)

Q 54.6: Talk

Thursday, March 17, 2022, 15:15–15:30, Q-H12

Quantum teleportation based on a full 4-state atom-photon Bell measurement — •Elena Arenskötter, Omar Elshehy, Christian Haen, Floriane Brunel, Stephan Kucera, and Jürgen Eschner — Universität des Saarlandes, Experimentalphysik, D-66123 Saarbrücken

The projection on Bell states is a key procedure for quantum-state teleportation and for entanglement swapping schemes as required for a quantum repeater [1,2]. We present a scheme that distinguishes between all four hybrid atom-photon Bell-states. It is based on heralded absorption [3] of the photonic qubit by a ⁴⁰Ca⁺ ion whereby the non-absorbed photons pass the ion in a second passage by a time delayed back-reflection. The scheme is demonstrated via atom-to-photon quantum teleportation of a qubit encoded in the D_5/2 Zeeman sub-levels of the ion onto the polarization qubit of a single 854 nm photon. We use a cavity-enhanced spontaneous parametric down-conversion source in interferometric configuration as resource of polarization entanglement which is tailored to match the D_5/2 - P_3/2 transition at 854 nm. Quantum process tomography between the atomic input states and the photonic output states validates the successful projection onto the Bell-states.

[1] M. Zukowski et al., Phys. Rev. Lett. 71, 4287 (1993)
[2] H.-J. Briegel et al., Phys. Rev. Lett. 81, 5932 (1998)
[3] C. Kurz et al., Nat. Commun. 5, 5527 (2014)