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

PY - 2023/3/15

Y1 - 2023/3/15

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.

M3 - Article

SN - 2643-1564

JO - Physical Review Research

JF - Physical Review Research

ER -