Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 61: Quantum information: Atoms and ions V
Q 61.6: Vortrag
Freitag, 22. März 2013, 12:15–12:30, E 214
Fast and efficient detection of Zeeman states of 87Rb via ionization — •Michael Krug1, Daniel Burchardt1, Norbert Ortegel1, Kai Redecker1, Julian Hofmann1, Wenjamin Rosenfeld1,2, and Harald Weinfurter1,2 — 1Ludwig-Maximilians-Universität, München — 2Max-Planck-Institut für Quantenoptik, Garching
Current experiments in quantum information such as quantum repeaters and atomic quantum computers rely on the capability to read out qubits fast and efficiently. Here we present a novel readout scheme for a qubit encoded in (degenerate) Zeeman states of a single 87Rb atom that fulfills these requirements.
In detail we use a two-photon transition with the first photon resonant to the D1-line and the second at a wavelength of 445 nm to ionize the atom within 500 ns. For evaluating the scheme we generate entanglement between a spontaneously emitted photon and the Zeeman state of the atom. By measuring the polarisation of the photon we project the atom onto a selected superposition of Zeeman states. This superposition is directly ionized without lifting the degeneracy where the measurement basis is defined by the polarization of the D1-light. We achieve a read out fidelity of the atom-photon state of 0.95±0.03. Together with the implementation of channel electron multipliers1 and the generation of entanglement between two separated atoms2 this will be a key ingredient towards a loophole free test of Bell’s inequality.
[1] F. Henkel et al., Phys. Rev. Lett. 105, 253001 (2010)
[2] J. Hofmann et al., Science, 337, 72 (2012)