We perform generalized measurements of a qubit by realizing the qubit as a coin in a photonic quantum walk and subjecting the walker to projective measurements. Our experimental technique can be used to realize photonically any rank-1 single-qubit positive operator-valued measure via constructing an appropriate interferometric quantum-walk network and then projectively measuring the walker's position at the final step.
@article{arxiv.1501.05540,
title = {Realization of single-qubit positive operator-valued measurement via a one-dimensional photonic quantum walk},
author = {Zhihao Bian and Jian Li and Hao Qin and Xiang Zhan and Rong Zhang and Barry C. Sanders and Peng Xue},
journal= {arXiv preprint arXiv:1501.05540},
year = {2015}
}
Comments
6 pages, 4 figures. This paper combines, improves and supplants the two earlier arXiv papers 1412.2355 and 1410.2407