Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 42: Poster: Quantum Optics and Photonics III

Q 42.16: Poster

Wednesday, March 2, 2016, 16:30–19:00, Empore Lichthof

Joint measurability and Channel Steering — •Fabiano Lever — University of Siegen, Sigen, Germany

The task of quantum steering refers to the idea of one party, (Alice) remotely affecting another party (Bob) state by performing local measurements on her half of a bipartite state. While entanglement between the two parties is a fundamental ingredient for the task, alone it is not sufficient. Steering requires stronger correlations than just entanglement. Moreover, it has recently been shown that in order to prove steering, Alice has to use incompatible measurements on her subsystem. This fact points us to the idea that incompatibility is necessary to perform measurament based quantum tasks.

Our work focuses on the application of this idea to the steering of broadcast quantum channels (i.e. channles with more that one output), modeling scenarios in which some of the information leaks to the environment. In particular, we show that there is a one to one mapping between the steerability of quantum channels and the joint measurability problem for a set of POVMs.