Optimal simultaneous measurements of incompatible observables of a single photon

Adetunmise C. Dada*, Will McCutcheon, Erika Andersson, Jonathan Crickmore, Ittoop Puthoor, Brian D. Gerardot, Alex McMillan, John Rarity, Ruth Oulton

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

129 Downloads (Pure)

Abstract

The ultimate limits of measurement precision are dictated by the laws of quantum mechanics. One of the most fascinating results is that joint or simultaneous measurements of noncommuting quantum observables are possible at the cost of increased unsharpness or measurement uncertainty. Many different criteria exist for determining what an “op-timal” joint measurement is, with corresponding different trade-off relations for the measurements. It is generally a nontrivial task to devise or implement a strategy that minimizes the joint-measurement uncertainty. Here, we implement the simplest possible technique for an optimal four-outcome joint measurement and demonstrate a type of optimal measurement that has not been realized before in a photonic setting. We experimentally investigate a joint-measurement uncertainty relation that is more fundamental in the sense that it refers only to probabilities and is independent of values assigned to measurement outcomes. Using a heralded single-photon source, we demonstrate quantum-limited performance of the scheme on single quanta. Since quantum measurements underpin many concepts in quantum information science, this study is both of fundamental interest and relevant for emerging pho-tonic quantum technologies.

Original languageEnglish
Article number340178
Pages (from-to)257-263
Number of pages7
JournalOptica
Volume6
Issue number3
Early online date27 Feb 2019
DOIs
Publication statusPublished - 20 Mar 2019

Fingerprint Dive into the research topics of 'Optimal simultaneous measurements of incompatible observables of a single photon'. Together they form a unique fingerprint.

  • Projects

    Programme Grant: Engineering Photonic Quantum Technologies.

    Rarity, J. G., O'Brien, J. L., Thompson, M. G., Erven, C., Sahin, D., Marshall, G. D., Barreto, J., Jiang, P., Mccutcheon, W. D., Silverstone, J. W., Sinclair, G. F., Kling, L., Banerjee, A., Wang, J., Santagati, R., Borghi, M., Woodland, E. M., Mawdsley, H. C. M. & Faruque, I. I.

    16/06/1415/06/19

    Project: Research, Parent

    Cite this

    Dada, A. C., McCutcheon, W., Andersson, E., Crickmore, J., Puthoor, I., Gerardot, B. D., McMillan, A., Rarity, J., & Oulton, R. (2019). Optimal simultaneous measurements of incompatible observables of a single photon. Optica, 6(3), 257-263. [340178]. https://doi.org/10.1364/OPTICA.6.000257