Technical note application requirements

Borregaard et al proposed a one-way quantum repeater protocol that requires emitter to detection efficiency of 95%.

LOQC hardware advantage can be achieved with $\eta_\mathrm{sps} \eta_\mathrm{demultiplexing} \eta_\mathrm{coupling} \eta_\mathrm{detection} \ge 0.45$ [article]. Given that the current state-of-the-art demultiplexing is $\eta=0.83$, we only need $\eta_\mathrm{tot}\approx0.54$, where $\eta_\mathrm{tot}$ is just for the single-photon generation components (no demultiplexing). Furthermore, since this technology is very scalable compared to quantum dots, and we know that multiple organic emitters have proven to create mutually indistinguishable photons, the demultiplexing efficiency might not even be relevant.

Application	Required $\eta_\mathrm{tot}$
LOQC QA demonstration	45%
One-way quantum repeater	95%