Speaker
Description
The quantum-to-classical transition is one of the great frontiers of pure physics research. Generating large and long-lived entanglement is a path to exploring it. To reach this path we are using large ensembles of rare-earth ions doped into transparent crystals. Due to their appealing optical and microwave transitions, combined with unparalleled coherence properties, they have been a strong candidate for studying macroscopic entanglement. Here, we try to push the “macroscopicity” of the entangled state, both in atom number and coherence time, by spin-squeezing a large ensemble of Europium ions doped into Y2SiO5. To achieve this, we implement quantum non-demolition measurements on our solid-state system, using a frequency-domain optical interferometer. The generated spin-squeezed states will also be invaluable to quantum sensing.
