All talks are now online linked to from the schedule.
PITP-CQIQC workshop will address various aspects of decoherence,
which is showing itself to be one of the most interesting and enigmatic
physical processes in physics, quite apart from its role in the emergence
of theclassical world from quantum theory.
Given that decoherence is currently of interest in almost every field of
physics, we have had to make a choice between different areas- this
workshop will be concentrating on the following areas and questions:
(i) The PHYSICAL MECHANISMS of DECOHERENCE: These clearly vary
depending on the the nature of the physical system- in
solid-state systems one has to deal with phonens, photons, spin
and charge excitations, and also localised excitations ranging
from nuclear spins to topological and other defects. In quantum
optical systems, and in quantum chemistry it is typically photons
and phonons that are of main interest. In atomic systems,
decoherence is involved in the study of delocalisation in
optical lattices, and the physics of phase fluctuations and
quasicondensates. One of the most
important questions is whether there exist other
decoherence mechanisms, as yet undiscovered,
perhaps of an 'intrinsic' nature, which will bear on fundamental
tests fo quantum mechanics.
(ii) QUANTUM INFORMATION PROCESSING: Decoherence is the main
problem confronting any practical implementation of quantum
computing and related information processing techniques.
Progress in the theory of quantum error correction, and various schemes
for suppressing decoherence, along wioth experimental
demonstrations of some of these, offer great hope for the
future. In addition new theoretical results on decoherence in various
schemes, ranging from topological quantum computing to quantum walks, show
how much more remains to be discovered. Related questions are obviously of
deep importance it all areas of "quantum control", as well as
in quantum communication.
(iii) EXPERIMENTAL ASPECTS of DECOHERENCE: Experiments in a wide
variety of systems are capable of probing decoherence- it can be
looked upon as a pest or a tool, depending on what one is doing.
There are strong disagreements
between theory and experiment in a number of systems- the
elucidation of the various decoherence mechanisms is a very
active field right now, with experiments on magnetic,
superconducting, and quantum dot systems, as well as cavities
and other quantum optical devices, and in cold atoms systems.
The workshop will examine some of what is known about
decoherence in experiments, how it can be manipulated,
suppressed, or explored, and what interesting future experiments
might be done.