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Article
Peer-Review Record

Photon Subtraction-Induced Plug-and-Play Scheme for Enhancing Continuous-Variable Quantum Key Distribution with Discrete Modulation

Appl. Sci. 2020, 10(12), 4175; https://doi.org/10.3390/app10124175
by Chao Yu 1,†, Shanhua Zou 1,2,*,†, Yun Mao 3 and Ying Guo 3,*
Reviewer 1: Anonymous
Reviewer 2: Anonymous
Appl. Sci. 2020, 10(12), 4175; https://doi.org/10.3390/app10124175
Submission received: 31 May 2020 / Revised: 14 June 2020 / Accepted: 15 June 2020 / Published: 17 June 2020
(This article belongs to the Special Issue Quantum Communications and Quantum Networks)

Round 1

Reviewer 1 Report

Page 5: The sentence "Since the entanglement
degree of coherent state is strengthened by photon subtraction operation, the PS-based scheme results
in the performance improvement in terms of maximal transmission distance, compared with the
traditional one-way DM CVQKD system." seems clear but it is not supported by exact calculation.  At least, a reference to such calculation seems suitable here.

Figure 3 demonstrates probability of successful photon subtraction, but even for zero transmittance the probability is not 1.  Why?

Does secret key ray depend on number of subtracted photons or transmittance coefficient?

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Reviewer 2 Report

The paper is well written. The research topic is relevant. Quantum cryptography (quantum key distribution) is now an advanced science.
The paper presents the results of research and modeling. This research provides a feasible method to improve the performance of PP CVQKD, which has a certain reference value for experiment and application.
It is recommended to supplement the list of sources with works of European scientists, for example: DOI: 10.1109/PDGC.2018.8745822 or DOI: 10.4018/IJCAC.2019010104.

Author Response

Please see the attachment.

Author Response File: Author Response.docx

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