The University of Tokyo: Picosecond Light Pulses Boost Ultrafast Quantum Computing Potential

A key advancement in optical quantum computing has been achieved by generating Schrödinger cat states in picosecond temporal modes, a sharp leap beyond previous nanosecond limitations. Mamoru Endo and colleagues at The University of Tokyo, in collaboration with National Institute of Advanced Industrial Science and Technology, NTT Inc, Institute of Physics, Palacky University, and 3 other institutions, accomplished this through multi-photon generalised photon subtraction, enabling a higher rate of operation previously hindered by low heralding probabilities. Reconstructing Wigner functions with up to four negative regions and an effective cat-state amplitude of 1.69, the work provides a platform…