or 281 billion gigabytes) — was 10 % bigger than we thought. The resizing comes as a result of faster growth in cameras, digital TV shipments, and better understanding of information replication. • By 2011, the digital universe will be 10 times the size it was in 2006. • As forecast, the amount

Suppose we are given a vector f in RN. How many linear measurements do we need to make about f to be able to recover f to within precision ɛ in the Euclidean (ℓ2) metric? Or more exactly, suppose we are interested in a class F of such objects— discrete digital signals, images, etc; how many linear

A digital computer is generally believed to be an efficient universal computing device; that is, it is believed able to simulate any physical computing device with an increase in computation time by at most a polynomial factor. This may not be true when quantum mechanics is taken into consideration

A computer is generally considered to be a universal computational device; i.e., it is believed able to simulate any physical computational device with a cost in com-putation time of at most a polynomial factol: It is not clear whether this is still true when quantum mechanics is taken

Can Reality be simulated by a huge Quantum Computer? Do we believe that Reality is made of something more than interacting quantum systems? The idea that the whole Physics is ultimately a quantum computation—a strong quantum version of the Church-Turing hypothesis well synthesized by the Wheeler’s coinage It from bit—is very appealing. It is theoretically very parsimonious: an Occam razor’s quality-guaranteed description of the world. But, if this is the case, then we need to understand the entire Physics as emergent from the quantum computation. Here I will make a short exploration on how this may come about. Ask a physicist what does he thinks the world is made of. Very likely the first impetuous answer will be: it is made of particles! But, at a second thought the answer will be: it is a Quantum Field. Particles are just states or the Field: they can be created and annihilated. We have indeed a beautiful Grand Unified Field Theory, and we are looking forward to see the Higg’s boson at the LHC. But what is the Quantum Field made of? Ultimately, it is made of quantum systems that are interacting, each system located at a different position in space. Things may be indeed more complicated than that, because the field is a continuum. But is Reality actually continuous? We don ’ t know: but it looks easier to think to Reality as a continuum. Now, suppose that this is not the case, namely Reality is ultimately discrete, and the continuum is only a mathematical fiction. Then, what else is out there more than interacting quantum

and other research outputs

of digital video recordings taken of 295 hundred subjects at one month intervals taken over a period of five months. We also describe a protocol for evaluating verification algorithms on the database. The database has been made available to anyone on request to the University of Surrey through http

prove constructively that universal one-way hash functions exist if any 1-1 one-way functions exist. Among the various applications of the primitive is a One-Way based Secure Digital Signature Scheme which is existentially secure against adoptive attacks. Previously, all provably secure signature

Having neither teachers nor students, the Dutch Digital University (DU) is not a real or even a virtual

Presentations from the day can be accessed below. Case studies relating to the implementation of uPortal at UK institutions were delivered by: