Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 56: Quantum Information (Coherence and Entanglement)

Q 56.6: Talk

Thursday, March 8, 2018, 11:45–12:00, K 1.019

Characterizing Multipartite Entanglement — •Jan Sperling and Ian Walmsley — Clarendon Laboratory, University of Oxford, United Kingdom

Quantum correlations between multiple degrees of freedom or particles play a fundamental role for quantum communication protocols. In this contribution, we describe how complex structures of multipartite entanglement can be certified using nonlinear eigenvalue equations [1]. This allows for the in-depth analysis of entanglement between many parties and the formulation of measurable entanglement criteria. Recent experimental applications to frequency combs underline the capabilities of our method [2]. Finally, the entangling dynamics of interacting systems is uncovered by nonlinear Schroedinger-type equations [3]. Consequently, we present a unified framework to study quantum entanglement in stationary and time-dependent, multipartite systems.

[1] J. Sperling and W. Vogel, Phys. Rev. Lett. 111, 110503 (2013). [2] S. Gerke, J. Sperling, W. Vogel, Y. Cai, J. Roslund, N. Treps, and C. Fabre, Phys. Rev. Lett. 114, 050501 (2015). [3] J. Sperling and I. A. Walmsley, Phys. Rev. Lett. 119, 170401 (2017).