Quantum cloning for absolute radiometry.
In the quantum regime information can be copied with only a finite fidelity. This fidelity gradually increases to 1 as the system becomes classical. In this Letter we show how this fact can be used to directly measure the amount of radiated power. We demonstrate how these principles can be used to build a practical primary standard.
Sanguinetti
Bruno
B
Group of Applied Physics, University of Geneva, 20 rue de l'Ecole-de-Médecine, CH-1211 Geneva 4, Switzerland.
Pomarico
Enrico
E
Sekatski
Pavel
P
Zbinden
Hugo
H
Gisin
Nicolas
N