Quantum-enhanced interferometer using Kerr squeezing

One of the prime applications of squeezed light is enhancing the sensitivity of an interferometer below the quantum shot-noise limit, but so far, no such experimental demonstration was reported when using the optical Kerr effect. In prior setups involving Kerr-squeezed light, the role of the interferometer was merely to characterize the noise pattern. The lack of such a demonstration was largely due to the cumbersome tilting of the squeezed ellipse in phase space. Here, we present the first experimental observation of phase-sensitivity enhancement in an interferometer using Kerr squeezing.

Automated summary

Enhancing the sensitivity of an interferometer below the quantum shot-noise limit using Kerr squeezing has not been experimentally demonstrated before. Previous experiments only characterized the noise pattern with the interferometer, as tilting the squeezed ellipse in phase space was cumbersome. This study presents the first experimental observation of phase-sensitivity enhancement in an interferometer using Kerr squeezing.