Exact interferometers for the concurrence and residual 3-tangle
Quantum Physics
2016-05-30 v7
Abstract
In this paper we describe a set of circuits that can measure the concurrence of a two qubit density matrix without requiring the deliberate addition of noise. We then extend these methods to obtain a circuit to measure one type of three qubit entanglement for pure states, namely the 3-tangle.
Keywords
Cite
@article{arxiv.quant-ph/0309212,
title = {Exact interferometers for the concurrence and residual 3-tangle},
author = {Hilary A. Carteret},
journal= {arXiv preprint arXiv:quant-ph/0309212},
year = {2016}
}
Comments
7 pages PDFLaTeX (format changed; older versions were in revtex4) 6 figures (now in pdf format, older versions were in encapsulated postscript). v7: small error in circuits corrected, and presentation improved. Old affiliation used in paper as that's where I was at the time. (The date is from the last change to the physics content. The files got lost in the shuffle when moving to a new laptop.)