A search algorithm for quantum state engineering and metrology

Knott, P A (2016) A search algorithm for quantum state engineering and metrology. New Journal of Physics, 18. 073033. ISSN 1367-2630

[img] PDF - Accepted Version
Available under License Creative Commons Attribution.

Download (563kB)
[img] PDF - Published Version
Available under License Creative Commons Attribution.

Download (1MB)

Abstract

In this paper we present a search algorithm that finds useful optical quantum states which can be created with current technology. We apply the algorithm to the field of quantum metrology with the goal of finding states that can measure a phase shift to a high precision. Our algorithm efficiently produces a number of novel solutions: we find experimentally-ready schemes to produce states that show significant improvements over the state-of-the-art, and can measure with a precision that beats the shot noise limit by over a factor of 4. Furthermore, these states demonstrate a robustness to moderate/high photon losses, and we present a conceptually simple measurement scheme that saturates the Cramer-Rao bound.

Item Type: Article
Keywords: quantum metrology, quantum state engineering, search algorithm, quantum optics
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Richard Chambers
Date Deposited: 23 Jun 2016 09:54
Last Modified: 09 Nov 2017 18:28
URI: http://sro.sussex.ac.uk/id/eprint/61684

View download statistics for this item

📧 Request an update