Exploring Hilbert Space: accurate characterisation of quantum information

Details Exploring Hilbert Space: accurate characterisation of quantum information Exploring Hilbert Space: accurate characterisation of quantum information

2001-08-20

arxiv.org/abs/quant-ph/0108088v1

Physical Review A 65, 012301 (2002)

Physics

Quantum Physics

4 pages, 3 figures. Submitted to Physical Review A

Scientific paper

10.1103/PhysRevA.65.012301

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.

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