Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 32: Quantum Information: Concepts and Methods V
Q 32.4: Vortrag
Mittwoch, 8. März 2017, 15:15–15:30, P 2
Entanglement and coherence in quantum state merging — •Alexander Streltsov1,2, Eric Chitambar3, Swapan Rana1, Manabendra Nath Bera1, Andreas Winter4,5, and Maciej Lewenstein1,5 — 1ICFO, ES-08860 Castelldefels, Spain — 2Freie Universität Berlin, D-14195 Berlin, Germany — 3Southern Illinois University, Carbondale, Illinois 62901, USA — 4Universitat Autònoma de Barcelona, ES-08193 Bellaterra (Barcelona), Spain — 5ICREA, ES-08010 Barcelona, Spain
Understanding the resource consumption in distributed scenarios is one of the main goals of quantum information theory. A prominent example for such a scenario is the task of quantum state merging where two parties aim to merge their parts of a tripartite quantum state. In standard quantum state merging, entanglement is considered as an expensive resource, while local quantum operations can be performed at no additional cost. Here, we consider the task of incoherent quantum state merging, where one of the parties has free access to local incoherent operations only. In this case the resources of the process are quantified by pairs of entanglement and coherence. We develop tools for studying this process, and apply them to several relevant scenarios. While quantum state merging can lead to a gain of entanglement, our results imply that no merging procedure can gain entanglement and coherence at the same time. We also provide a general lower bound on the entanglement-coherence sum, and show that the bound is tight for all pure states.
For more details see Phys. Rev. Lett. 116, 240405 (2016).