Horizons for Information Societies
Seminar #3

The 3rd seminar on Horizons for Information Societies was an introduction to quantum information. Mr Louis () and Dr Van Loock () presented, respectively, basic concepts in quantum physics and applications of entanglement and quantum optics at the .

See also: previous seminar (#2), next seminar (#4).



Slides of the presentations:

Date: 22 February 2007 (15:00-17:00)
Location: , Tokyo, Japan
Language: English
Registration fees: None
Organization: Dr ()


Basic Concepts in Quantum Physics
by Mr

Abstract: Quantum mechanics has become one of the most accurately tested physical theories. However it is conceptually very challenging and often seems counter-intuitive, as illustrated by a quote from Niels Bohr, one of the founding fathers of quantum physics: "Anyone who is not shocked by quantum theory has not understood a single word". In this talk I will briefly introduce the essential ideas which make quantum states so interesting, starting with superposition. Based on superposition, 'qubits' (quantum bits) can be introduced and will help us understand quantum parallelism. This observation is the basis for most of the developments in quantum computing. Then we will move on to entanglement and the non-locality which can take place in the quantum world.

Speaker: Mr Louis obtained a master's degree in physics from the University of Bristol (United Kingdom). Since 2005, he is a Monbusho doctor student from at in the quantum information science group.


Applications of Entanglement and Quantum Optics
by Dr

Abstract: Continuing on from the previous talk I will outline some fundamental uses of superposition and entanglement in quantum communications: quantum teleportation and quantum key distribution (quantum cryptology). We shall see how quantum states cannot be perfectly copied and how this can be used to effectively encode classical information. After what I will introduce quantum optics as a physical realization, from single photons to coherent states. Finally the recent concept of measurement based quantum computing (or one-way quantum computing) will be described.

Speaker: After obtaining a master's degree in Physics from the University of Erlangen (Germany), Dr Van Loock did his Ph.D. thesis at the University of Bangor (United Kingdom) in the area of quantum optics and quantum information. Then after a first post doc at University of Erlangen (Germany) he joined the quantum information science group at for a second post-doctorate.