Engineering an Array of Squeezed Spin States by Coherent Rydberg Dressing

Squeezed spin states are entangled states that enable a reduced quantum uncertainty in precision measurements of time and electromagnetic fields. A number of applications, from field imaging to clock comparisons for tests of fundamental physics, require generating squeezing in multiple spatially separated ensembles. We engineer an array of spin-squeezed ensembles of cesium atoms by off-resonantly coupling to a Rydberg state, a technique known as Rydberg dressing. We discuss optimization of our experimental sequence, consisting of optical pulses for squeezing and microwave pulses for dynamical decoupling, to enhance the coherence of our interactions and minimize atom loss. We observe squeezing across multiple ensembles, each containing hundreds of atoms, with the strength of squeezing controlled by the local intensity of the dressing light. Our work demonstrates the capacity of local interactions to produce squeezed states and paves the way for applications including atomic tweezer clocks.