Space division multiplexing chip-to-chip quantum key distribution

TL;DR

This paper demonstrates a silicon chip-based quantum key distribution system using space division multiplexing via multicore fiber, enabling multiple independent quantum keys for secure quantum networks.

Contribution

It introduces a novel integrated photonic chip approach for SDM-QKD, facilitating parallel quantum keys in a scalable quantum communication network.

Findings

Successful experimental demonstration of SDM-QKD on a silicon chip

Generation of multiple independent quantum keys simultaneously

Potential for scalable quantum network implementation

Abstract

Quantum cryptography is set to become a key technology for future secure communications. However, to get maximum benefit in communication networks, transmission links will need to be shared among several quantum keys for several independent users. Such links will enable switching in quantum network nodes of the quantum keys to their respective destinations. In this paper we present an experimental demonstration of a photonic integrated silicon chip quantum key distribution protocols based on space division multiplexing (SDM), through multicore fiber technology. Parallel and independent quantum keys are obtained, which are useful in crypto-systems and future quantum network.