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 […]