Some implications of superconducting quantum interference to the application of master equations in engineering quantum technologies

S. N A Duffus, K. N. Bjergstrom, V. M. Dwyer, J. H. Samson, T. P. Spiller, A. M. Zagoskin, W. J. Munro, Kae Nemoto, M. J. Everitt

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper we consider the modeling and simulation of open quantum systems from a device engineering perspective. We derive master equations at different levels of approximation for a superconducting quantum interference device (SQUID) ring coupled to an ohmic bath. We demonstrate that the master equations we consider produce decoherences that are qualitatively and quantitatively dependent on both the level of approximation and the ring's external flux bias. We discuss the issues raised when seeking to obtain Lindbladian dissipation and show, in this case, that the external flux (which may be considered to be a control variable in some applications) is not confined to the Hamiltonian, as often assumed in quantum control, but also appears in the Lindblad terms.

Original languageEnglish
Article number064518
Pages (from-to)1-10
Number of pages10
JournalPhysical Review B
Volume94
Issue number6
DOIs
Publication statusPublished - 24 Aug 2016

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