Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 7: Quantum Information: Concepts and Methods 1
Q 7.7: Vortrag
Montag, 14. März 2011, 12:00–12:15, SCH A118
On Hybrid Entanglement — •Karsten Kreis1, 2 and Peter van Loock1, 2 — 1OQI, MPL, Erlangen, Germany — 2Institute of Theoretical Physics I, Uni Erlangen-Nuremberg, Erlangen, Germany
In this talk, we define hybrid entanglement as entanglement between a discrete-variable quantum system and an infinite-dimensional, continuous-variable quantum system. A classification scheme is given leading to a distinction between pure hybrid entangled states, mixed hybrid entangled states (those effectively supported by an overall finite-dimensional Hilbert space), and so-called truly hybrid entangled states (those which cannot be described in an overall finite-dimensional Hilbert space). Physically relevant examples for states of either regime are presented and entanglement witnessing as well as quantification are discussed. Regarding witnessing the well-known inseparability criteria by Shchukin and Vogel play a crucial role [1]. Quantification may be accomplished by describing the states in finite-dimensional subspaces and employing discrete-variable measures such as the logarithmic negativity. [1] E. Shchukin and W. Vogel, Phys. Rev. Lett. 95, 230502 (2005).