Can quantum Markov evolutions ever be dynamically decoupled?

John Gough, Hendra I. Nurdin

Research output: Chapter in Book/Report/Conference proceedingConference Proceeding (Non-Journal item)

7 Citations (SciVal)


We consider the class of quantum stochastic evolutions (SLH-models) leading to a quantum dynamical semigroup over a fixed quantum mechanical system (taken to be finite-dimensional). We show that if the semigroup is dissipative, that is, the coupling operators are non-zero, then a dynamical decoupling scheme based on unitary rotations on the system space cannot suppress decoherence even in the limit where the period between pulses vanishes. We emphasize the role of the Fock space dilation used here to construct a quantum stochastic model, as there are often dilations of the same semigroup using an environmental noise model of lower level of chaoticity for which dynamical decoupling is effective. We show that the Chebotarev-Gregoratti Hamiltonian behind a quantum stochastic evolution is an example of a Hamiltonian dynamics on a joint system-environment that cannot be dynamically decoupled in this way.
Original languageEnglish
Title of host publication56th IEEE Annual Conference on Decision and Control
PublisherIEEE Press
Number of pages6
ISBN (Print)978-150902873-3
Publication statusPublished - 2017
Event56th IEEE Annual Conference on Decision and Control - Melbourne Convention and Exhibition Centre (MCEC), Melbourne, Australia
Duration: 12 Dec 201715 Dec 2017


Conference56th IEEE Annual Conference on Decision and Control
Abbreviated title CDC2017
Period12 Dec 201715 Dec 2017


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