Since 2002 Perimeter Institute has been recording seminars, conference talks, and public outreach events using video cameras installed in our lecture theatres. Perimeter now has 7 formal presentation spaces for its many scientific conferences, seminars, workshops and educational outreach activities, all with advanced audio-visual technical capabilities. Recordings of events in these areas are all available On-Demand from this Video Library and on Perimeter Institute Recorded Seminar Archive (PIRSA). PIRSA is a permanent, free, searchable, and citable archive of recorded seminars from relevant bodies in physics. This resource has been partially modelled after Cornell University's arXiv.org.
We attempt at characterizing the correlations present in the quantum computational model DQC1, introduced by Knill and Laflamme [Phys. Rev. Lett. 81, 5672 (1998)]. The model involves a collection of qubits in the completely mixed state coupled to a single control qubit that has nonzero purity. Although there is little or no entanglement between two parts of this system, it provides an exponential speedup in certain problems. On the contrary, we find that the quantum discord across the most natural split is nonzero for typical instances of the DQC1 ciruit.
The Cosmic Microwave Background (CMB) consists of a bath of photons
emitted when the universe was 380,000 years old. Carrying the imprint
of primordial fluctuations that seeded the formation of structure in
the universe, the CMB is one of the most valuable known tools for
studying the early universe. In our modern, post WMAP era, the utility
of studying temperature anisotropies in the CMB is clear and much of
the work has been done. I will describe two exciting new directions in
which the field is currently heading: small-scale secondary CMB