Abstract
Quantum key distribution (QKD) is a crucial technology for information security in the future. Developing simple and efficient ways to establish QKD among multiple users is important to extend the applications of QKD in communication networks. Herein, we proposed a scheme of symmetric dispersive optics QKD and demonstrated an entanglement-based quantum network based on it. In the experiment, a broadband entangled photon pair source was shared by end users via wavelength and space division multiplexing. The wide spectrum of generated entangled photon pairs was divided into 16 combinations of frequency-conjugate channels. Photon pairs in each channel combination supported a fully connected subnet with eight users by a passive beam splitter. Eventually, it showed that an entanglement-based QKD network over 100 users could be supported by one entangled photon pair source in this architecture. It has great potential on applications of local quantum networks with large user number.
Highlights
Information security is of significant importance in many applications
We develop a quantum network based on another way of quantum entanglement distribution, in which the entangled photon pairs generated by a quantum light source are sent to N end users by a 1 × N beam splitter directly
To further improve the utilization of the entanglement resource provided by the quantum light source, we introduce wavelength multiplexing in this entanglement-based Quantum key distribution (QKD) network, exploring how many users can be supported by one quantum light source in this way
Summary
Information security is of significant importance in many applications. Nowadays, the security of these applications is mainly based on public-key cryptography, which assumes that the computation power is limited. We develop a quantum network based on another way of quantum entanglement distribution, in which the entangled photon pairs generated by a quantum light source are sent to N end users by a 1 × N beam splitter directly. The signal and idler photons in two frequency-conjugate wavelength channels are entangled and contribute to coincidence events They are selected and multiplexed into one optical fiber and distributed to N users randomly by a 1 × N beam splitter. If the quantum light source could support M frequency-conjugate wavelength channel combinations, it can support M QKD subnets
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