Quantum adiabatic elimination at arbitrary order for photon number measurement. Issue 2 (2020)

• Record Type: Journal Article
• Authors: Sarlette, Alain; Rouchon, Pierre; Essig, Antoine; Ficheux, Quentin; Huard, Benjamin
• Is Part Of: IFAC-PapersOnLine. Volume 53:Issue 2(2020)
• Page Start: 250
• Page End: 256
• Publication Date: 2020
• Subjects: Automatic control -- Periodicals; 629.805
• DOI: 10.1016/j.ifacol.2020.12.131
• Languages: English
• ISSNs: 2405-8963

Abstract

Abstract: Adiabatic elimination is a perturbative model reduction technique based on timescale separation and often used to simplify the description of composite quantum systems. We here analyze a quantum experiment where the perturbative expansion can be carried out to arbitrary order, such that: (i) we can formulate in the end an exact reduced model in quantum form; (ii) as the series provides accuracy for ever larger parameter values, we can discard any condition on the timescale separation, thereby analyzing the intermediate regime where the actual experiment is performing best; (iii) we can clarify the role of some gauge degrees of freedom in this model reduction technique.