Group:Research Talk
Title:Quantum Circuits Architecture
Speaker: Giulio Chiribella University
Time: 2011-12-28 09:00-2011-12-28 10:00
Venue:FIT 1-222


 The optimized design of quantum circuits is a fundamental problem in Quantum Information. For any desired task, be it the ultra-precise estimation of a parameter in quantum metrology, the design of an efficient algorithm, or the security proof of a cryptographic protocol, it is crucial to determine which are the best performances allowed by the laws of Quantum Mechanics. In this talk I will present a general, top-down approach to the optimization of quantum circuits, known as the method of quantum combs [1,2]. The method is based on a correspondence between circuits and multipartite quantum states, which greatly simplifies the search for optimal circuits and allows one to treat circuits as input data in higher-order computations.

As applications of the method, I will discuss optimal architectures for quantum metrology, multiround protocols for reference frames alignment, optimal learning and programming of quantum gates, and multiround discrimination of quantum channels. Finally, I will briefly highlight the relevance of quantum combs to the information-theoretic foundations of Quantum Theory [3].


[1] G. Chiribella, G. M. D'Ariano, and P. Perinotti, Quantum Circuits Architecture, Phys. Rev. Lett. 101, 060401 (2008).

[2] G. Chiribella, G. M. D'Ariano, and P. Perinotti, Theoretical Framework for Quantum Networks, Phys. Rev. A 80, 022339 (2009).

[3] G. Chiribella, G. M. D'Ariano, and P. Perinotti, Informational Derivation of Quantum Theory, Phys. Rev. A 84, 012311 (2011).

Short Bio:
 Giulio Chiribella is a Senior Postdoctoral Fellow at Perimeter Institute for Theoretical Physics and an Affiliate Member of the Institute for Quantum Computation, Waterloo. His research areas are Quantum Information, Foundations of Quantum Mechanics and Mathematical Physics. Dr. Chiribella's research on group theoretical methods for Quantum Estimation Theory was recently awarded the Hermann Weyl Prize at the 28th International Colloquium on Group Theoretical Methods in Physics, Northumbria University, Newcastle upon Tyne, UK, July 2010.