Quantum amplifier: measurement with entangled spins.
It is experimentally demonstrated that entangled quantum states can be used to amplify perturbations and to increase changes in observable values. The physical system is seven nuclear spins of single-labeled (13)C-benzene in a liquid crystalline matrix. An entangled state of six proton spins was used to monitor interaction with the (13)C spin.
Lee
Jae-Seung
JS
Department of Chemistry, Kent State University, Kent, Ohio 44242-0001, USA.
Khitrin
A K
AK