Parity measurements help build better quantum light sources

Researchers from East China Normal University and New York University Shanghai have developed a new protocol for preparing specialized quantum states crucial for advancing quantum technologies. The work demonstrates the generation of squeezed states, achieving approximately 9 decibels of quantum noise reduction after three parity measurements, with potential for even greater noise reduction as the number of measurements increases. This technique extends beyond squeezed states to also prepare cat and Gottesman-Kitaev-Preskill states, and the authors state the scheme is universal, allowing for the preparation of an arbitrary state. Bosonic modes utilized in this…