Experimental estimation of entanglement at the quantum limit.
Entanglement is the central resource of quantum information processing and the precise characterization of entangled states is a crucial issue for the development of quantum technologies. This leads to the necessity of a precise, experimental feasible measure of entanglement. Nevertheless, such measurements are limited both from experimental uncertainties and intrinsic quantum bounds. Here we present an experiment where the amount of entanglement of a family of two-qubit mixed photon states is estimated with the ultimate precision allowed by quantum mechanics.
Brida
Giorgio
G
INRIM, I-10135, Torino, Italy.
Degiovanni
Ivo Pietro
IP
Florio
Angela
A
Genovese
Marco
M
Giorda
Paolo
P
Meda
Alice
A
Paris
Matteo G A
MG
Shurupov
Alexander
A