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Tuesday, January 17, 2023

Microlaser Chip Adds Dimensions to Quantum Communication

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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