Quantum Enhanced Metrology using Rubidium Atoms

Quantum metrology exploits entangled states of particles to improve sensing precision beyond the limit achievable using uncorrelated particles, i.e. the standard quantum limit. We present the experimental creation of a 20dB spin-squeezed state that can be used to improve the precision of atomic clocks and atom interferometers. In addition, we demonstrate a method for entanglement-enhanced metrology without needing low-noise detection, which has been the major bottleneck in recent quantum metrology experiments.