Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 50: Quantum Information (Concepts and Methods) IV

Q 50.3: Vortrag

Donnerstag, 14. März 2019, 14:45–15:00, S HS 001 Chemie

Quantum steering of an open driven qubit — •Konstantin Beyer, Kimmo Luoma, and Walter Strunz — Technische Universität Dresden, Institut für Theoretische Physik, 01062 Dresden

We investigate quantum steering of an open qubit in the framework of collision models. The qubit and its environment form a bipartite system which is, in general, quantum correlated. Measuring the environment, therefore, yields information about the qubit system. Depending on the measurement scenarios used to observe the environment, the state of the system gets confined to different steering ensembles. This nonlocal phenomenon is known as quantum or EPR steering and can be demonstrated by the violation of a steering inequality.

In contrast to other approaches to open system dynamics, such as master equations, the environment is an inherent part of the collision model. Therefore, it becomes very obvious how the measurements affect the system state.