Duncan Campbell (Carnegie Mellon)
Thu, 23 May 2019, 11:00
"A short story of non-thermal fixed points"
Christian-Marcel Schmied
Thu, 23 May 2019, 13:00

Entanglement in quantum dynamics and quantum technologies

Philipp Hauke , KIP & ITP
The structure of a many-body quantum state is deeply characterized by the entanglement between its constituents. Existing and future quantum machines, such as the Heidelberg quantum architecture, hand us now a unique opportunity to engineer and study these quantum correlations. However, a precise theoretical understanding of entanglement has been achieved at present only if extremely few particles are involved. The role of entanglement that is spread among many particles, its potential for quantum technologies, and its connection to accessible correlation functions are widely open questions. I will illustrate these issues on two examples. First, I will show how temporal correlations are related to the quantum Fisher information, a type of many-body entanglement that permits quantum-enhanced metrology. Second, I will discuss open challenges in quantum annealing. This quantum technology aims at solving NP-complete optimization problems such as the travelling salesman or the knapsack problem, but a possible quantum-enhancement is poorly understood. I will argue that if entanglement can generate a quantum speedup, then it will likely have to be entanglement involving large numbers of particles.
26 Apr 2019, 12:30
Institut für Theoretische Physik, Phil12; R 106

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