Modular network for high-rate quantum conferencing
Carlo Ottaviani, Cosmo Lupo, Riccardo Laurenza, and Stefano Pirandola

TL;DR
This paper introduces a modular continuous-variable quantum network architecture that enables high-rate, secure conference keys over arbitrary distances by combining measurement-device-independent star modules with a relay-based protocol.
Contribution
It proposes a novel modular design for quantum networks using measurement-device-independent star modules, enhancing security and scalability for quantum conferencing.
Findings
Achieves high-rate quantum conference keys over arbitrary distances.
Utilizes off-the-shelf optical components for practical implementation.
Ensures unconditional security through measurement-device-independent architecture.
Abstract
One of the main open problems in quantum communication is the design of efficient quantum-secured networks. This is a challenging goal, because it requires protocols that guarantee both unconditional security and high communication rates, while increasing the number of users. In this scenario, continuous-variable systems provide an ideal platform where high rates can be achieved by using off-the-shelf optical components. At the same time, the measurement-device independent architecture is also appealing for its feature of removing a substantial portion of practical weaknesses. Driven by these ideas, here we introduce a modular design of continuous-variable network where each individual module is a measurement-device-independent star network. In each module, the users send modulated coherent states to an untrusted relay, creating multipartite secret correlations via a generalized Bell…
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