Fig. 2: Experimental setup for quantum hypothesis testing.
From: Enhanced quantum hypothesis testing via the interplay between coherent evolution and noises
a The proton spins in formic acid are contained in a 5 mm NMR tube and pneumatically shuttled between a 1.3-T prepolarizing magnet and a rubidium vapor cell. A magnetic shield isolates the hypothesis testing zone from the external Earth’s magnetic field. A guiding field is applied in the z direction. The proton NMR signal is measured with 87Rb magnetometer. b Magnetic noise of 87Rb magnetometer. The noise floor is about 13 fT Hz−1/2. c Time sequence of quantum hypothesis testing.
