1. Experimental demonstration of optimal unambiguous two-out-of-four quantum state elimination
- Author
-
Webb, Jonathan W., Puthoor, Ittoop V., Ho, Joseph, Crickmore, Jonathan, Blakely, Emma, Fedrizzi, Alessandro, and Andersson, Erika
- Subjects
Quantum Physics - Abstract
A core principle of quantum theory is that non-orthogonal quantum states cannot be perfectly distinguished with single-shot measurements. However, it is possible to exclude a subset of non-orthogonal states without error in certain circumstances. Here we implement a quantum state elimination measurement which unambiguously rules out two of four pure, non-orthogonal quantum states -- ideally without error and with unit success probability. This is a generalised quantum measurement with six outcomes, where each outcome corresponds to excluding a pair of states. Our experimental realisation uses single photons, with information encoded in a four-dimensional state using optical path and polarisation degrees of freedom. The prepared state is incorrectly ruled out up to $3.3(2)\%$ of the time., Comment: 11 pages, 3 figures
- Published
- 2022
- Full Text
- View/download PDF