Data from: Ultrafast, all-optical coherence of molecular electron spins in room-temperature, water solution

The tunability and spatial precision of paramagnetic molecules makes them
attractive for quantum sensing. However, usual microwave-based detection
methods have poor temporal and spatial resolution, and optical methods
compatible with room-temperature solutions have remained elusive. Here, we
utilize pump-probe polarization spectroscopy to initialize and track
electron spin coherence in a molecule. Designed to efficiently couple
spins to light, aqueous K2IrCl6 enables detection of few-picosecond free
induction decay at room temperature and micromolar concentrations.
Viscosity is found to strongly vary decoherence lifetimes. This work
redefines the meaning of room-temperature coherence by improving
experimental time resolution by up to five orders of magnitude. Doing so
unveils a new regime of electron spin coherence, opening the door to new
synthetic design and applications of molecular quantum bits.