Distinguishing between non-orthogonal quantum states of a single spin
Abstract
An important task for quantum information processing is optimal discrimination between two non-orthogonal quantum states, which until now has only been realized optically. Here, we present and compare experimental realizations of optimal quantum measurements for distinguishing between two non-orthogonal quantum states encoded in a single ^14 N nuclear spin. Implemented measurement schemes are the minimum-error measurement (known as Helstrom measurement), unambiguous state discrimination using a standard projective measurement, and optimal unambiguous state discrimination (known as IDP measurement), which utilizes a three-dimensional Hilbert space. Measurement efficiencies are found to be above 80% for all schemes and reach a value of 90% for the IDP measurement
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Cite
@article{arxiv.1206.0453,
title = {Distinguishing between non-orthogonal quantum states of a single spin},
author = {Gerald Waldherr and Adetunmise C. Dada and Philipp Neumann and Fedor Jelezko and Erika Andersson and Jorg Wrachtrup},
journal= {arXiv preprint arXiv:1206.0453},
year = {2016}
}
Comments
9 pages, 3 figures, 1 table