Hannover 2013 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 32: Quantum information: Atoms and ions III

Q 32.2: Talk

Tuesday, March 19, 2013, 14:30–14:45, A 310

High fidelity state-selective detection by scattering laser light — •Sabine Wölk and Christof Wunderlich — Experimentelle Quantenoptik, Universität Siegen, Siegen, Germany

An important ingredient for experiments in quantum information science is efficient quantum state-selective detection. With trapped ions high fidelity, single-shot detection of qubit states by scattering and detecting near-resonant laser light is state-of-the-art. The fidelity of detection could be limited, because during the measurement process it is possible that the ion changes its state. This could happen, for example, through spontaneous emission or off-resonant excitations.

For ions, where only one of the qubit states can decay to the other state and then stays there, detection schemes exist that take this effect into account [1,2]. However, for ions like ¹⁷¹Yb⁺ both qubit states can be populated during detection. Therefore, we have to take into account that not only one but several state-changes are possible during one measurement. In this talk we present generalizations of existing measurement schemes to this type of ions, discuss new approaches, and present detailed simulations.

[1] A. H. Myerson et. al., Phys. Rev. Lett. 100, 200502 (2008)

[2] B. Hemmerling et. al., New J. of Phys. 14, 023043 (2012)