Testing sequential quantum measurements: how can maximal knowledge be extracted?
The extraction of information from a quantum system unavoidably implies a modification of the measured system itself. In this framework partial measurements can be carried out in order to extract only a portion of the information encoded in a quantum system, at the cost of inducing a limited amount of disturbance. Here we analyze experimentally the dynamics of sequential partial measurements carried out on a quantum system, focusing on the trade-off between the maximal information extractable and the disturbance. In particular we implement two sequential measurements observing that, by exploiting an adaptive strategy, is possible to find an optimal trade-off between the two quantities.
Dipartimento di Fisica, Sapienza Università di Roma, Roma 00185, Italy.
Eleonora
E
Nagali
Simone
S
Felicetti
Pierre-Louis
PL
de Assis
Vincenzo
V
D'Ambrosio
Radim
R
Filip
Fabio
F
Sciarrino
D000465:Algorithms; D055598:Chemical Phenomena; D008962:Models, Theoretical; D017785:Photons; D011789:Quantum Theory