English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In a comment, Xu, Curty, Qi, Qian, and Lo claimed that discrete-variable (DV)measurement device independent (MDI) quantum key distribution (QKD) wouldcompete with its continuous-variable (CV) counterpart at metropolitandistances. Actually, Xu et al.'s analysis supports exactly the opposite byshowing that the experimental rate of our CV protocol (achieved with practicalroom-temperature devices) remains one order of magnitude higher than theirpurely-numerical and over-optimistic extrapolation for qubits, based onnearly-ideal parameters and cryogenic detectors (unsuitable solutions for arealistic metropolitan network, which is expected to run on cheaproom-temperature devices, potentially even mobile). The experimental rate ofour protocol (expressed as bits per relay use) is confirmed to be two-threeorders of magnitude higher than the rate of any realistic simulation ofpractical DV-MDI-QKD over short-medium distances. Of course this does not meanthat DV-MDI-QKD networks should not be investigated or built, but increasingtheir rate is a non-trivial practical problem clearly beyond the analysis of Xuet al. Finally, in order to clarify the facts, we also refute a series ofincorrect arguments against CV-MDI-QKD and, more generally, CV-QKD, which weremade by Xu et al. with the goal of supporting their thesis.

MDI-QKD: Continuous- versus discrete-variables at metropolitan distances