Hamburg 2009 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 23: Quanteninformation: Photonen II
Q 23.2: Vortrag
Dienstag, 3. März 2009, 14:15–14:30, VMP 6 HS-D
Experimental observation of an entire family of four-photon entangled states — •Witlef Wieczorek1,2, Christian Schmid1,2, Nikolai Kiesel1,2, Reinhold Pohlner1,2, Otfried Gühne3,4, and Harald Weinfurter1,2 — 1Max-Planck-Institut für Quantenoptik, D-85748 Garching — 2Department für Physik, LMU München, D-80799 München — 3Institut für Quantenoptik und Quanteninformation, A-6020 Innsbruck — 4Institut für Theoretische Physik, Universität Innsbruck, A-6020 Innsbruck
The experimental observation and characterization of multi-partite entangled states aids the development of quantum information applications and helps to gain a deeper understanding of quantum mechanical systems. Spontaneous parametric down conversion in combination with linear optics is widely and successfully used for observing these states. However, so far, experimental set-ups based on that approach were usually tailored for a single state only, see e.g. [1]. Here, we report on the experimental observation and analysis of an entire family of highly entangled four-photon states, which is given by the superposition of a four photon GHZ state and the product of two Bell states. We demonstrate how these states can be obtained within a single set-up by the tuning of a single, experimentally easily accessible parameter and analyze particular entanglement properties [2].
[1] D. Bouwmeester et al., Phys. Rev. Lett. 82, 1345 (1999); Z. Zhao et al., Nature 430, 54 (2004); P. Walther et al., Nature 434, 169 (2005); B. P. Lanyon et al., Phys. Rev. Lett. 100, 060504 (2008)
[2] W. Wieczorek et al., Phys. Rev. Lett. 101, 010503 (2008)