Reachability in Infinite Dimensional Unital Open Quantum Systems with Switchable GKS-Lindblad Generators
arxiv(2019)
Abstract
In quantum systems theory one of the fundamental problems boils down to:
given an initial state, which final states can be reached by the dynamic system
in question. Here we consider infinite dimensional open quantum dynamical
systems following a unital Kossakowski-Lindblad master equation extended by
controls. More precisely, their time evolution shall be governed by an
inevitable potentially unbounded Hamiltonian drift term H_0, finitely many
bounded control Hamiltonians H_j allowing for (at least) piecewise constant
control amplitudes u_j(t)∈ℝ plus a bang-bang (i.e. on-off)
switchable noise term Γ_V in Kossakowski-Lindblad form.
Generalizing standard majorization results from finite to infinite dimensions,
we show that such bilinear quantum control systems allow to approximately reach
any target state majorized by the initial one, as up to now only has been known
in finite dimensional analogues.—The proof of the result is currently limited
to the control Hamiltonians H_j being bounded and noise terms
Γ_V with compact normal V.
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