Experimental protocol for high-fidelity heralded photon-to-atom quantum state transfer

Christoph Kurz (), Michael Schug, Pascal Eich, Jan Huwer, Philipp Müller and Jürgen Eschner
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Christoph Kurz: Universität des Saarlandes, Experimentalphysik, Campus E2 6
Michael Schug: Universität des Saarlandes, Experimentalphysik, Campus E2 6
Pascal Eich: Universität des Saarlandes, Experimentalphysik, Campus E2 6
Jan Huwer: Universität des Saarlandes, Experimentalphysik, Campus E2 6
Philipp Müller: Universität des Saarlandes, Experimentalphysik, Campus E2 6
Jürgen Eschner: Universität des Saarlandes, Experimentalphysik, Campus E2 6

Nature Communications, 2014, vol. 5, issue 1, 1-5

Abstract: Abstract A quantum network combines the benefits of quantum systems regarding secure information transmission and calculational speed-up by employing quantum coherence and entanglement to store, transmit and process information. A promising platform for implementing such a network are atom-based quantum memories and processors, interconnected by photonic quantum channels. A crucial building block in this scenario is the conversion of quantum states between single photons and single atoms through controlled emission and absorption. Here we present an experimental protocol for photon-to-atom quantum state conversion, whereby the polarization state of an absorbed photon is mapped onto the spin state of a single absorbing atom with >95% fidelity, while successful conversion is heralded by a single emitted photon. Heralded high-fidelity conversion without affecting the converted state is a main experimental challenge, in order to make the transferred information reliably available for further operations. We record >80 s−1 successful state transfer events out of 18,000 s−1 repetitions.

Date: 2014
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DOI: 10.1038/ncomms6527

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