Deployed quantum link characterization via Bayesian ancilla-assisted process tomography: erratum (Optics Letters (2025) 50 (2478) DOI: 10.1364/OL.545625)

We correct errors in reporting count rates in Opt. Lett. 50, 2478 (2025)10.1364/OL.545625. Since the errors amount to a scale factor on the photon flux, the corrections have no influence on the state and process tomography results and conclusions of the original Letter. oward the end of the second paragraph of the right column on Page 2480 of [1] reads “An average coincidence rate of 20,056 s–1 is detected (over all states in a basis) with an average standard deviation of 51 s–1 , which compared to the local flux of 36,642 s–1 suggests a total channel loss of 2.62 dB.” However, the coincidence number is erroneously indicated as a rate, while in reality, this coincidence number, including the local flux, is detected over the integration time of 30 s. Thus, the sentence should instead read “An average of 20,056 coincidences are detected in 30 s (over all states in a basis) with an average standard deviation of 51, which compared to the local mean of 36,642 suggests a total channel loss of 2.62 dB.” Similarly, the y-axis labels in Figs. 3(b) and 4(b) should be changed from “Flux (s–1 )” to “Flux (30 s)” since the numbers reflect the total counts measured over 30 s instead of normalized to 1 s. Practically, these corrections reduce the reported source brightness by a factor of 30. Accordingly, they have no impact on the demonstrated method, tomographic results (e.g., density or Choi matrices with corresponding fidelities), or conclusions regarding the channel.