Direct estimations of linear and non-linear functionals of a quantum state

Preprint

4 March 2002

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.quant-ph/0203016

Abstract

We present a simple quantum network, based on the controlled-SWAP gate, that can extract certain properties of quantum states without recourse to quantum tomography. It can be used used as a basic building block for direct quantum estimations of both linear and non-linear functionals of any density operator. The network has many potential applications ranging from purity tests and eigenvalue estimations to direct characterization of some properties of quantum channels. Experimental realizations of the proposed network are within the reach of quantum technology that is currently being developed.

Keywords

CHARACTERIZATION OF SOME PROPERTIES
QUANTUM ESTIMATIONS
DIRECT ESTIMATIONS
QUANTUM NETWORK
SIMPLE QUANTUM
QUANTUM STATE
PROPERTIES
EIGENVALUE
LINEAR

All Related Versions

Version 1, 2002-03-04, ArXiv
Published version: Physical Review Letters, 88 (21), 217901.

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