Nanowerk October 22, 2022 Researchers at the University of Colorado combined entanglement and delocalization to create a matter-wave interferometer that can sense accelerations with a precision that surpasses the standard quantum limit. In their system each individual atom fell freely under gravity and simultaneously traversed two paths through space while entangled with the other atoms. They demonstrated both quantum non-demolition measurements and cavity-mediated spin interactions for generating squeezed momentum states with directly observed sensitivity 3.4+1.1−0.9 dB and 2.5+0.6−0.6 dB below the standard quantum limit, respectively. They injected an entangled state into a Mach–Zehnder light-pulse interferometer with directly observed sensitivity 1.7+0.5−0.5 dB below the […]
Category Archives: Interferometers
A quantum wave in two crystals
Phys.org July 18, 2022 In a crystal, all atoms are connected to each other and have a fixed spatial relationship to each other—so you can minimize the influence of external disturbances on the neutron wave. But this monolithic design limits the possibilities. Alignment of two crystals to create a neutron interferometer did not reach the required accuracy. Scanning X-ray interferometers also consist of separate silicon crystals and are similarly sensitive. An international team of researchers (Austria, France, Italy) used the technology developed for the X-ray interferometer. The team succeeded in detecting neutron interference in a system of two separate crystals. […]