Picture of person typing on laptop with programming code visible on the laptop screen

World class computing and information science research at Strathclyde...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

The Department also includes the iSchool Research Group, which performs leading research into socio-technical phenomena and topics such as information retrieval and information seeking behaviour.

Explore

Optimal parameter estimation of a depolarizing channel

Ban, Masashi and Barnett, Stephen M. and Sasaki, Masahide (2002) Optimal parameter estimation of a depolarizing channel. Physical Review A, 66 (2). ISSN 1094-1622

[img]
Preview
Text (strathprints005853)
strathprints005853.pdf - Accepted Author Manuscript

Download (298kB) | Preview

Abstract

We investigate strategies for estimating a depolarizing channel for a finite dimensional system. Our analysis addresses the double optimization problem of selecting the best input probe state and the measurement strategy that minimizes the Bayes cost of a quadratic function. In the qubit case, we derive the Bayes optimal strategy for any finite number of input probe particles when bipartite entanglement can be formed in the probe particles.