Separating cascaded photons from a single quantum dot: Demonstration of multiplexed quantum cryptography
Thomas Aichele, Gael Reinaudi, Oliver J. Benson · Physical Review B · 2004
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.