Average number is an insufficient metric for interferometry. (22nd December 2021)

• Record Type: Journal Article
• Authors: Branford, Dominic; Rubio, Jesús
• Is Part Of: New journal of physics. Volume 23:Number 12(2021)
• Publication Date: 2021-12-22
• Subjects: quantum metrology -- optical interferometry -- variable-number states; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/ac3571
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: We argue that analysing schemes for metrology solely in terms of the average particle number can obscure the number of particles effectively used in informative events. For a number of states we demonstrate that, in both frequentist and Bayesian frameworks, the average number of a state can essentially be decoupled from the aspects of the total number distribution associated with any metrological advantage.