Abstracts

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Harvard John A. Paulson School of Engineering and Applied Sciences
Electrical Engineering Seminar Series

Stephanie Wehner
QuTech, Delft University of Technology

"Quantum Communication Networks: the Certifiable Road Ahead."

Tuesday, September 6, 2016
1:00 - 2:00 p.m.
Maxwell Dworkin 119

What precisely is a quantum communication network? While quantum communication is often associated solely with quantum cryptography, it can enable many other interesting applications. Here, we propose stages towards the development of a full blown quantum communication network - a quantum internet. Each stage of this development is distinguished by the successively larger type of applications that it supports, and we present tests to certify the successful attainment of each stage by implementations.

In the second part of this talk we then zoom in further into testing quantum communication and devices. The first is a procedure which we call capacity tomography which allows us to estimate the (single shot) capacity of a quantum communication channel. This procedure is easier than performing full tomography, and can deal with arbitrarily correlated errors and memory effects in the quantum devices. The second is to test the performance of local quantum network nodes, and also quantum computing devices. Concretely, we derive confidence bounds for the use of randomized benchmarking to characterize quantum gates which are several orders of magnitude better than previous estimates, enabling the procedure to be applied to many qubit systems.

Speaker: Stephanie Wehner is an Associate Professor at QuTech, Delft University of Technology. Her passion is the theory of quantum information in all its facets, and she has written numerous scientific articles in both physics and computer science. Stephanie is one the founders of QCRYPT, which has become the largest conference in quantum cryptography. From 2010 to 2014, her research group was located at the Centre for Quantum Technologies, National University of Singapore, where she was first Assistant and later Associate Professor. Previously, she was a postdoctoral scholar at the California Institute of Technology in the group of John Preskill. In a former life, she worked as a professional hacker in industry.