Exploring Hilbert Space: accurate characterisation of quantum information
Quantum Physics
2009-11-07 v1
Abstract
We report the creation of a wide range of quantum states with controllable degrees of entanglement and entropy using an optical two-qubit source based on spontaneous parametric downconversion. The states are characterised using measures of entanglement and entropy determined from tomographically determined density matrices. The Tangle-Entropy plane is introduced as a graphical representation of these states, and the theoretic upper bound for the maximum amount of entanglement possible for a given entropy is presented. Such a combination of general quantum state creation and accurate characterisation is an essential prerequisite for quantum device development.
Cite
@article{arxiv.quant-ph/0108088,
title = {Exploring Hilbert Space: accurate characterisation of quantum information},
author = {A. G. White and D. F. V. James and W. J. Munro and P. G. Kwiat},
journal= {arXiv preprint arXiv:quant-ph/0108088},
year = {2009}
}
Comments
4 pages, 3 figures. Submitted to Physical Review A