Projectivities of Informationally Complete Measurements

Author:

Shu Hao12ORCID

Affiliation:

1. Shenzhen University Shenzhen 518000 China

2. South China University of Technology Guangzhou 510641 China

Abstract

AbstractThe physical problem behind informationally complete (IC) measurements is determining an unknown state statistically by measurement outcomes, known as state tomography. It is of central importance in quantum information processing such as channel estimating, device testing, quantum key distribution, etc. However, constructing such measurements with good properties is a long‐standing problem. In this work, projective realizations of IC measurements are investigated. Conditions of informational completeness are presented with proofs first. Then the projective realizations of IC measurements, including proposing the first general construction of minimal projective IC measurements (MPICM) in no prime power dimensional systems, as well as determining an unknown state in via a single projective measurement with some kinds of optimalities in a larger system, are investigated. Finally, The results can be extended to local state tomography. Some discussions on employing several kinds of optimalities are also provided.

Publisher

Wiley

Subject

General Physics and Astronomy

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