User-defined quantum key distribution

Understand

Quantum key distribution (QKD) provides secure keys resistant to code-breaking quantum computers.

• As headed towards commercial application, it is crucial to guarantee the practical security of QKD systems.
• However, the difficulty of security proof limits the flexibility of protocol proposals, which may not fulfill with real application requirements.
• Here we show a protocol design framework that allows one to securely construct the protocol using arbitrary non-orthogonal states.