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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Nanooptik

Humboldt-Universität zu Berlin | Mathematisch-Naturwissen­schaft­liche Fakultät | Institut für Physik | Nanooptik | Publications | Separating cascaded photons from a single quantum dot: Demonstration of multiplexed quantum cryptography

Thomas Aichele, Gaël Reinaudi, and Oliver Benson (2004)

Separating cascaded photons from a single quantum dot: Demonstration of multiplexed quantum cryptography

Phys. Rev. B, 70(23):235329.

We use cascaded two-photon emission from a single quantum dot in order to double the efficient transmission rate in a quantum key distribution protocol. The energetically nondegenerate photons are separated with a single-photon add/drop filter based on a Michelson interferometer. Time correlation measurements are discussed and compared with numerical simulations.