Quantum Key Distribution (QKD) in Multi-Core Fiber (MCF)

Quantum Key Distribution (QKD) is a secure communication method that uses the principles of quantum mechanics to enable the distribution of encryption keys between remote parties with guaranteed security. It is effective in detecting eavesdropping attempts, as any interception of quantum signals alters their state, alerting legitimate users.

In the context of Multi-Core Fiber (MCF), QKD can be enhanced by leveraging its spatial division multiplexing capabilities. MCF allows the simultaneous transmission of quantum and classical signals by dedicating specific cores for quantum channels while using others for classical data. This reduces interference and improves performance compared to traditional single-core fibers. Experiments have demonstrated the successful integration of QKD with MCF over distances exceeding 50 km, maintaining high security and supporting data rates over 1 Tb/s. This advancement positions MCF as a promising technology for next-generation secure communications.

For further details, you can explore the research in Optics Express or Wikipedia