CQT Talk by Claude Fabre, Laboratoire Kastler Brossel
Date/Time: Monday, 27 May at 4:00 pm
Venue: CQT Seminar Room, S15-03-15
Title: Highly Multimode Quantum Frequency Combs: a New Tool for Quantum Computing
Abstract: Although ultrafast optics and quantum information science have both revolutionized the concept of information processing, they have done so largely independently. At the confluence of these two fields, we have developed a parametrically generated quantum optical frequency comb and demonstrated its embedded multipartite entanglement with techniques imported from coherent control.
This fully characterized quantum object is scalable, easily addressable, and robust with respect to decoherence, and therefore represents a unique tool for practical quantum information applications. Furthermore, the ability to directly interrogate quantum properties of the comb has allowed us to precisely extract its underlying multi-dimensional temporal / spectral structure, which represents a stride forward in exploring the multifarious possibilities offered by highly multimode quantum optics.
CQT Talk by Paolo Zanardi, University of Southern California & CQT
Date/Time: Thursday, 30 May at 4:00 pm
Venue: CQT Seminar Room, S15-03-15
Title: Adiabatic quantum algorithm for search engine ranking
Abstract: I will discuss an adiabatic quantum algorithm for generating a quantum pure state encoding of the PageRank vector, the most widely used tool in ranking the relative importance of internet pages. Extensive numerical simulations provided evidence that, for some families of webgraphs, this algorithm may prepare the quantum PageRank state in a time which, on average, scales polylogarithmically in the number of webpages. The main topological feature of the underlying web graph allowing for such a scaling is the out-degree distribution. The top ranked $\log(n)$ entries of the quantum PageRank state can then be estimated with a polynomial quantum speedup. Moreover, the quantum PageRank state can be used in "q-sampling" protocols for testing properties of distributions, which require exponentially fewer measurements than all classical schemes designed for the same task. This can be used to decide whether to run a classical update of the PageRank.
(collaboration with Silvano Garnerone (IQC) and Daniel Lidar (USC))
CQT Tutorial by Nelly Ng Huei Ying, CQT
Date/Time: Friday, 07 Jun at 10:00 am
Venue: CQT Seminar Room, S15-03-15
Title: Quantum Thermodynamics with information theory approach
Duration of each tutorial is 3 hours with a 15 minutes break.
Tutorials Schedule:
- Coin Flipping, Loïck Magnin, 19 July, Friday 10am-1pm.
- Abstract state spaces, Corsin Pfister, 16 August, Friday 10am-1pm.
- Non-local games: classical vs. quantum, Jed Kaniewski, 6 September, Friday 10am-1pm.
- Reference frame agreement protocols, Tanvirul Islam, 4 October, Friday 10am-1pm.
- Harmonic Analysis 101 with applications to quantum information,Stephanie Wehner, 8 November, Friday 10am-1pm.
- Complementarity, Patrick Coles, 29 November, Friday 10am-1pm.
