Abstract 2 June 2015

Realizing quantum networks, algorithms, and simulations using photons

Stefanie Barz

In this talk I will present a series of experiments in the field of photonic quantum information processing. 
In the first part of the talk, I will show how quantum physics enables us to perform secure computations in quantum networks [1].  I will present experiments realizing both quantum and classical secure delegated computations using quantum resources. In the quantum case, this means that a nearly-classical client can access the resources of a more powerful quantum server without divulging the content of the requested computation [2, 3]. Furthermore, in the classical case, a classical client with limited computing capacity can delegate a classical computation securely using non-classical resources [4].
In the second part of the talk, I will present different experiments realizing photonic implementations of quantum algorithms and quantum simulations, such as the quantum algorithm for solving of systems of linear equations [5] and the quantum simulation of the two-site XY model [6]. 

[1] A. Broadbent, J. Fitzsimons and E. Kashefi, in Proceedings of the 50th Annual Symposium on Foundations of Computer Science, 517 (2009) 
[2] S. Barz, E. Kashefi, A. Broadbent, J. Fitzsimons, A. Zeilinger, and P. Walther, Science 335, 303 (2012)
[3] S. Barz, J. Fitzsimons, E. Kashefi, and P. Walther, Nature Physics 9, 727 (2013)
[4] S. Barz, V. Dunjko, F. Schlederer, M. Moore, E. Kashefi, I. A. Walmsley, arXiv:1501.06730 (2015)
[5] S. Barz, I. Kassal, M. Ringbauer, Y. O. Lipp, B. Dakic, A. Aspuru-Guzik, P. Walther, Scientific Reports 4, 6115 (2014) 
[6] S. Barz, B. Dakic, Y. O. Lipp, F. Verstraete, J. D. Whitfield, P. Walther, PRX 5, 021010 (2015)

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