TY - JOUR
T1 - Experimental demonstration of optimal unambiguous two-out-of-four quantum state elimination
AU - Webb, Jonathan
AU - Puthoor, Ittoop Vergheese
AU - Ho, Joseph
AU - Crickmore, Jonathan
AU - Blakely, Emma
AU - Fedrizzi, Alessandro
AU - Andersson, Anna Erika Elisabeth
N1 - Funding Information:
We thank Neil Ross for helping design and 3D print components. This work was supported by the EPSRC Quantum Communications Hub (Grant No. EP/T001011/1). J.C. acknowledges support from the EPSRC Condensed Matter Centre for Doctoral Training, Grant No. EP/L015110/1.
Publisher Copyright:
© 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
PY - 2023/5/12
Y1 - 2023/5/12
N2 - 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 generalized quantum measurement with six outcomes, where each outcome corresponds to excluding a pair of states. Our experimental realization uses single photons, with information encoded in a four-dimensional state using optical path and polarization degrees of freedom. The prepared state is incorrectly ruled out up to 3.3(2)% of the time.
AB - 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 generalized quantum measurement with six outcomes, where each outcome corresponds to excluding a pair of states. Our experimental realization uses single photons, with information encoded in a four-dimensional state using optical path and polarization degrees of freedom. The prepared state is incorrectly ruled out up to 3.3(2)% of the time.
UR - http://www.scopus.com/inward/record.url?scp=85163317327&partnerID=8YFLogxK
U2 - 10.1103/PhysRevResearch.5.023094
DO - 10.1103/PhysRevResearch.5.023094
M3 - Article
SN - 2643-1564
VL - 5
JO - Physical Review Research
JF - Physical Review Research
IS - 2
M1 - 023094
ER -