Continuous-variable quantum key distribution in a multi-way setting

We extend the asymptotic security of continuous variable quantum key distribution using one-way and two-way quantum communication to a multi-way setting: Quantum signals travel many times between the parties before the final detection. We assume that the encoded signals are Gaussian-modulated coherent states that travel each time through the same Gaussian channel characterized by loss and thermal noise. We then quantify the reverse-reconciliation performance of the protocol presenting results for even or odd numbers of signal exchange.

Automated summary

We extend the security of continuous variable quantum key distribution by applying one-way and two-way quantum communication to a multi-way setting. We assume the signals are encoded using Gaussian-modulated coherent states and travel through Gaussian channels characterized by loss and thermal noise. We quantify the reverse-reconciliation performance of the protocol for even and odd numbers of signal exchange.