Séminaire de Nicolas Menicucci : "Gigantic quantum computers made of laser light".

Mardi 5 mai 2015


DateMardi 5 mai 2015
LieuSalle 210, couloir 13-23

Laboratoire Kastler-Brossel
Tour 13-23, 209 - Case 74
Universite Pierre et Marie Curie
4 place Jussieu - 75252 Paris cedex 05 - France

Nicolas Menicucci,de l’Université de Sydney, donner un cours le mardi 5 mai à 11h30 au Laboratoire Kastler-Brossel (Jussieu) et aura pour titre : "Gigantic quantum computers made of laser light".

Résumé (anglais) :
Quantum computers promise ultra-fast computation, but to be useful they need
to be big — really big. I will discuss recent theoretical and experimental
breakthroughs in designing and building a huge quantum computer made out of
laser light itself.

The key component to such a quantum computer is a special type of entangled state called a continuous-variable cluster state. These states are are simple to make using lasers and can be scaled up with ease to gigantic sizes. Once in possession of such a state, measurements alone enable full quantum computation, with the choice of measurements determining the computation to be performed. This is surprising because it means one can quantum compute simply by *looking* at a quantum system in a particular way.

In this talk, I will describe the basics of measurement-based quantum computing using continuous-variable cluster states, including a crucial recent result showing that noise in such systems is tolerable. I will also report on their experimental realizations, including two recent demonstrations : a 60-mode cluster state and a 10,000-mode (!) cluster state. In addition to shattering world records for the number of quantum objects entangled together, these states are prototypes for the basic building block of an ultra-large-scale quantum computer.