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Heralded single-ion – single-photon interactions

September 26, 2013 - 1:00pm
Speaker: 
Christoph Kurz
Institution: 
Saarland University

Abstact:

Christoph Kurz, Jan Huwer, Michael Schug, Joyee Ghosh, José Brito, Pascal Eich, Philipp Müller, Stephan Kucera, Jürgen Eschner

Experimentalphysik, Universität des Saarlandes, Campus E2 6, 66123 Saarbrücken, Germany
http://www.uni-saarland.de/lehrstuhl/eschner

We study various implementations of controlled interaction between single atoms and single photons in the context of quantum networks.

Specifically, we demonstrate the absorption of a single laser photon by a single trapped atomic ion, mapping the photon polarization state onto the atomic spin state, which is heralded by the detection of a Raman-scattered photon [t.b.p.]. This enables photon-to-atom entanglement transfer [1].

We also generate single photons with controlled temporal, spectral, and polarization properties through a laser-driven spontaneous Raman process [2-4]. The photons have between ~15 ns and ~1 µs duration and are near-Fourier-limited [2, 3]. In one experiment, single photons from one ion are transmitted over ~1 m distance to a second single ion where they are absorbed; individual absorption events are detected employing a quantum-jump heralding scheme [4].

In another experiment, we demonstrate heralded absorption by a single trapped ion of single photons from a Spontaneous Parametric Down-Conversion (SPDC) source; the entanglement of the SPDC photon pair is manifested in the polarization correlation between photon absorption and detection of the heralding partner [5, 6].

 [1] Heralded mapping of photonic entanglement into single atoms in free space: proposal for a loophole-free Bell test, N. Sangouard et al., New J. Phys. 15, 085004 (2013)

[2] Bandwidth-Tunable Single-Photon Source in an Ion-Trap Quantum Network, M. Almendros et al., Phys. Rev. Lett. 103, 213601 (2009)

[3] A high-rate source for single photons in a pure quantum state, C. Kurz et al., New J. Phys. 15, 055005 (2013)

[4] Heralded Photonic Interaction between Distant Single Ions, M. Schug et al., Phys. Rev. Lett. 110, 213603 (2013)

[5] Heralded single-photon absorption by a single atom, N. Piro et al., Nature Physics 7, 17 (2011)

[6] Photon entanglement detection by a single atom, J. Huwer et al., New J. Phys. 15, 025033 (2013)

CSS 2115
College Park, MD 20742

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