Fig. 6: The 4-user network data, with a total of 6 entanglement links. | npj Quantum Information

Fig. 6: The 4-user network data, with a total of 6 entanglement links.

From: Coexistence of entanglement-based quantum channels with DWDM classical channels over hollow core fibre in a four node quantum communication network

Fig. 6: The 4-user network data, with a total of 6 entanglement links.

a–d shows the secret key rate (SKR) of the links over a 55 hour run. Dots show when coexisted classical light is present, and stars show when coexisted classical light being turned off. Solid lines show the linear fit of the coexisted SKR, and dashed lines show the linear fit of the SKR with no coexisted light. a shows the SKR of the three links with no-coexisting light, specifically between Bob, Chloe, and Dave. b, c and d show the SKR of the Alice*-Bob, Alice*-Chloe, and Alice*-Dave links respectively. e–h shows example correlation histograms for links in the entanglement network, where the correlation value is given per 10 ps bin. Blue lines show data from when classical channels are on, and orange show when coexistence was off. Dashed lines shows the accidental correlation background calculated from the single photon detection rates. The black dashed line shows the accidental correlation rate if the HCF were replaced with a standard SMF fibre of the same length.

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