Fiber optic gyroscopes (FOG) based on the Sagnac effect are a valuable tool in sensing and navigation and enable accurate measurements in applications ranging from spacecraft and aircraft to self-driving vehicles such as autonomous cars. As with any classical optical sensors, the ultimate performance of these devices is bounded by the standard quantum limit (SQL). Quantum-enhanced interferometry allows us to overcome this limit using non-classical states of light. Here, we report on an entangled-photon gyroscope that uses path-entangled NOON-states (N=2) to provide phase supersensitivity beyond the standard-quantum-limit.
@article{arxiv.1810.02213,
title = {Entanglement-enhanced optical gyroscope},
author = {Matthias Fink and Fabian Steinlechner and Johannes Handsteiner and Jonathan P. Dowling and Thomas Scheidl and Rupert Ursin},
journal= {arXiv preprint arXiv:1810.02213},
year = {2019}
}