Quantum key secure communication protocol via enhanced superdense coding

In this study, an improvement, and a generalization to more than two bits of the superdense coding protocol are presented. Based on both innovations, novel quantum key secure communication is developed, which uses N-bit key, optical multiplexers demultiplexers, repeaters, work thanks entanglement swapping. way, new allows simultaneous transmission N-bits encrypted through channels. This study incorporates implementations platforms: Quirk simulator, 16-qubits Melbourne processor IBM Q Experience program. Errors in terms number repeaters studied. Finally, completed by analyzing advantages link, with works, versus commonly used electromagnetic link for between submerged submarines presence third party that acts as eavesdropper.