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Stochastic Analysis and Applications

Existence and stability results for strong solutions of lipschitzian quantum stochastic differential equations

E. O. Ayoola

Published May 22, 2002• 2 citations
Publisher

Abstract

We employ the Boson Fock space stochastic calculus of Hudson and Parthasarathy to establish the existence, uniqueness and stability of strong solutions of Lipschitzian quantum stochastic differential equations in a locally convex space by a method of successive approximations. It is further shown that our results generalize analogous results concerning classical stochastic differential equation to the present noncommutative quantum setting involving unbounded linear operators on a Hilbert space.

DOI
10.1081/sap-120003434

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We employ the Boson Fock space stochastic calculus of Hudson and Parthasarathy to establish the existence, uniqueness and stability of strong solutions of Lipschitzian quantum stochastic differential equations in a locally convex space by a method of successive approximations. It is further shown that our results generalize analogous results concerning classical stochastic differential equation to the present noncommutative quantum setting involving unbounded linear operators on a Hilbert space.
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Kurzweil or generalized differential equations associated with Lipschitzian quantum stochastic differential equations (QSDEs) are introduced and studied. This is accomplished within the framework of the Hudson-Parthasarathy formulations of quantum stochastic calculus. Results concerning the equivalence of these classes of equations satisfying the Caratheodory conditions are presented. It is further shown that the associated Kurzweil equation may be used to obtain a reasonably high accurate approximate solutions of the QSDEs. This generalize analogous results for classical initial value problems to the noncommutative quantum setting involving unbounded linear operators on a Hilbert space. Numerical examples are given.
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We establish further results concerning the existence, uniqueness and stability of weak solutions of quantum stochastic differential equations (QSDEs). Our results are achieved by considering a more general Lipschit condition on the coefficients than our previous considerations in [1]. We exhibit a class of Lipschitzian QSDEs in the formulation of this paper, whose coefficients are only continuous on the locally convex space of the weak solution.Journal of the Nigerian Association of Mathematical Physics Vol. 8 2004: pp. 5-8