Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 20: Quantum Information: Concepts and Methods 3
Q 20.3: Vortrag
Dienstag, 15. März 2011, 11:00–11:15, SCH A118
Taming multiparticle entanglement — •Bastian Jungnitsch1, Tobias Moroder1, and Otfried Gühne1,2 — 1Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Technikerstraße 21a, A-6020 Innsbruck, Austria — 2Fachbereich Physik, Universität Siegen, Walter-Flex-Straße 3, D-57068 Siegen, Germany
Current experiments have succeeded in manipulating up to fourteen qubits [1], moving tasks like measurement-based quantum computation closer to the realm of possibility.
We present an approach to characterize genuine multiparticle entanglement using appropriate approximations in the space of quantum states [2]. This leads to a criterion for entanglement which can easily be calculated using semidefinite programming and improves all existing approaches significantly. Experimentally, it can also be evaluated when only some observables are measured. Furthermore, it results in a computable entanglement monotone for genuine multiparticle entanglement which reduces to the negativity in the bipartite case.
Based on this criterion, we develop an analytical approach for the entanglement detection in graph states. When specialized to, e.g., linear cluster states, this approach leads to witnesses whose white noise robustnesses approach unity exponentially fast with an increasing number of qubits.
[1] T. Monz et al., arXiv:1009.6126
[2] B. Jungnitsch, T. Moroder and O. Gühne, arXiv: 1010.6049