Figure 2: Basic idea of our mdiQKD protocol with an adaptive Bell measurement. | Nature Communications

Figure 2: Basic idea of our mdiQKD protocol with an adaptive Bell measurement.

From: All-photonic intercity quantum key distribution

Figure 2

M is the pulse number. In this protocol, the node C first performs quantum non-demolition (QND) measurements to confirm the successful arrival of single photons, followed by optical switches (SW) to send the surviving photons to Bell measurement (BM) modules.

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