Secure Multi-State Quantum Key Distribution with Wave-Division Multiplexing

Description

These cybersecurity methods use multiple wavelengths and wavelength-division multiplexing (WDM) to distribute ternary, quaternary, and multi-state cryptographic keys through existing single-photon quantum channels. As done with established QKD protocols, each wavelength transmits only two possible quantum states along two different possible configurations. The distribution of trits (-, 0, or +) or quatrits (Ψ1, Ψ2, Ψ3, or Ψ4) is initiated by transmitting single photons per wavelength that are oriented along two possible states. Additional wavelengths are added to transmit keys with additional states such as penta-bits, hexa-bits, or higher. The various photons with their corresponding wavelengths are combined by a first WDM to be transmitted to the receiving party through a single quantum channel. Upon receipt, a second WDM redirects for analysis of the photons to their respective detecting schemes with matching wavelength capabilities.

Additional information