Discovered late through an alumni connection ...
Microlaser Chip Adds Dimensions to Quantum Communication
Penn Engineering Today
Devorah Fischler, November 21, 2022
A multi-institutional team led by researchers at the University of Pennsylvania School of Engineering and Applied Science (Penn Engineering) developed a chip that doubles the quantum information space of any previous on-chip laser by communicating in qudits (quantum bits in a state of superposition greater than two levels). The hyperdimensional microlaser-produced qudits boost the maximum secrete key rate for information exchange from 1 bit to 2 bits per pulse, supporting four levels of superposition and clearing a path for further dimensional enlargement. The researchers realized the four-level system by devising a method to manipulate and couple the orbital angular momentum and spin of photons.
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