Dynamic decoupling and homogenization of continuous variable systems

Christian Arenz, Daniel Burgarth, Robin Hillier

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

10 Dyfyniadau (Scopus)
181 Wedi eu Llwytho i Lawr (Pure)

Crynodeb

For finite-dimensional quantum systems, such as qubits, a well established strategy to protect such systems from decoherence is dynamical decoupling. However many promising quantum devices, such as oscillators, are infinite dimensional, for which the question if dynamical decoupling could be applied remained open. Here we first show that not every infinite-dimensional system can be protected from decoherence through dynamical decoupling. Then we develop dynamical decoupling for continuous variable systems which are described by quadratic Hamiltonians. We identify a condition and a set of operations that allow us to map a set of interacting harmonic oscillators onto a set of non-interacting oscillators rotating with an averaged frequency, a procedure we call homogenization. Furthermore we show that every quadratic system-environment interaction can be suppressed with two simple operations acting only on the system. Using a random dynamical decoupling or homogenization scheme, we develop bounds that characterize how fast we have to work in order to achieve the desired uncoupled dynamics. This allows us to identify how well homogenization can be achieved and decoherence can be suppressed in continuous variable systems
Iaith wreiddiolSaesneg
Rhif yr erthygl135303
CyfnodolynJournal of Physics A: Mathematical and Theoretical
Cyfrol50
Rhif cyhoeddi13
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 03 Maw 2017

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