Physicists Invent a Chip That Stores a Photon’s Quantum State

Physicists Invent a Chip That Stores a Photon’s Quantum State

Physicists in Switzerland led by Nicolas Gisin of the University of Geneva reported last week in Nature that they have made a solid-state device capable of storing photons for as long as 1 microsecond. The invention will aid in the development of light-based quantum-cryptography networks, which are theoretically impervious to hacking but are currently limited in range to a few dozen kilometers, primarily because of a lack of a suitable way to store the quantum state of photons.

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