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Exploring Bell inequalities for the device-independent certification of multipartite entanglement depth

Szeminárium Exploring Bell inequalities for the device-independent certification of multipartite entanglement depth
Előadó

Pei-Sheng Lin

National Cheng Kung University, Taiwan
Kapcsolattartó Dr. Vértesi Tamás
Időpont 2019-11-05 11:00
Helyszín Atomki, nagyelőadó (Debrecen, Bem tér 18/c, XII. épület 3. emelet)
Esemény leírása

Techniques developed for device-independent characterizations allow one to certify certain physical properties of quantum systems without assuming any knowledge of their internal workings. Such a certification, however, often relies on the employment of device-independent witnesses catered for the particular property of interest. Here, we consider a one-parameter family of multipartite, two-setting, two-outcome Bell inequalities and demonstrate the extent to which they are suited for the device-independent certification of genuine many-body entanglement (and hence the entanglement depth) present in certain well-known multipartite quantum states, including the generalized GHZ states with unbalanced weights and the higher-dimensional generalizations of balanced GHZ states. Besides, we also demonstrate how two-setting, two-outcome Bell inequalities can be constructed—based on the so-called GHZ paradox—to witness the entanglement depth of various graph states, including the ring graph states, the fully-connected graph states, and some linear graph states, etc.