QKD as a service is based on key agreement protocols, McEliece Crptosystem and encrypted OTP.  Quantum key distribution algorithms will be quantum resistant.  Quantum Key distribution as a service will cater to multiple users and generate keys in parallel. Quantum key distribution signals can be generated simultaneously and sent using an optical channel. This is using the key management service pattern which is available in Google, Amazon and Microsoft cloud. The key states are managed through the key management services. The states are generated, used, rotated and destroyed. QKD as a service helps in avoiding attacks and errors. Qubits cannot be replicated because of the law of physics. The secret key are not saved in the Quantum key distribution data stores. The key security is improved because of not saving the quantum keys.

Quantum keys are based on the photon properties for sharing bits between source and destination. The quantum information is used for generation of the keys.  The interception of the key is identified as there is a change in the quantum state. The keys which are corrupted will be rejected. Randomness of the keys will be real and hack proof