Quantum stochastic cocycles and completely bounded semigroups on operator spaces

Lindsay, J. Martin and Wills, Stephen J. (2014) Quantum stochastic cocycles and completely bounded semigroups on operator spaces. International Mathematics Research Notices, 2014 (11). pp. 3096-3139. ISSN 1073-7928

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An operator space analysis of quantum stochastic cocycles is undertaken. These are cocycles with respect to an ampliated CCR flow, adapted to the associated filtration of subspaces, or subalgebras. They form a noncommutative analogue of stochastic semigroups in the sense of Skorohod. One-to-one correspondences are established between classes of cocycle of interest and corresponding classes of one-parameter semigroups on associated matrix spaces. Each of these `global' semigroups may be viewed as the expectation semigroup of an associated quantum stochastic cocycle on the corresponding matrix space. The classes of cocycle covered include completely positive contraction cocycles on an operator system, or C*-algebra; completely contractive cocycles on an operator space; and contraction operator cocycles on a Hilbert space. As indicated by Accardi and Kozyrev, the Schur-action matrix semigroup viewpoint circumvents technical (domain) limitations inherent in the theory of quantum stochastic differential equations. An infinitesimal analysis of quantum stochastic cocycles from the present wider perspective is given in a sister paper.

Item Type:
Journal Article
Journal or Publication Title:
International Mathematics Research Notices
Uncontrolled Keywords:
?? quantum stochastic cocycle, ccr flow, e-semigroup,operator space, operator system, matrix space, completely bounded, completely positive. ccr flowe-semigroupoperator spaceoperator systemmatrix space completely bounded completely positivemathematics(all) ??
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Deposited On:
18 Sep 2012 11:09
Last Modified:
23 Feb 2024 00:48