Subject: Re: [Qirg] use cases draft comments

From: Chonggang Wang <[email-masked]>
Date: Fri, 20 Aug 2021 15:35:13 +0000

Dear Rodney,

Thank you for your good comments. We just uploaded a new v08 which has incorporated your suggestions. Please also kindly refer to my replies inline below with my initial CW.

Best regards,
Chonggang

-----Original Message-----
From: Qirg <[email-masked]> On Behalf Of Rodney Van Meter
Sent: Thursday, July 29, 2021 5:38 PM
To: [email-masked]
Cc: Rodney Van Meter <[email-masked]>
Subject: [Qirg] use cases draft comments

Chonggang et al.,

Some comments on the use cases draft:

As QIRG, I think it would be best if we adopted a fairly consistent terminology. I think Wojtek’s draft uses the term *Bell pair*, whereas this draft uses *EPR pair*.
CW - "EPR pair" has been replaced with "Bell pair" now.

You attribute the idea of a remote CNOT to Yimsiriwattana, but it’s a few years older than that. Ike Chuang and Daniel Gottesman originated it:
CW - "[ Yimsiriwattana]" has been replaced with the two references you suggested below.

@Article{gottsman99:universal_teleport,
  author =       {Daniel Gottesman and Isaac L. Chuang},
  title =        {Demonstrating the viability of universal quantum
                  computation using teleportation and single-qubit
                  operations},
  journal =      {Nature},
  year =         1999,
  volume =       402,
  pages =        {390--393},
  comment =      {Shows how to do a CNOT via teleportation.  Uses four
                  ancillae in a special entangled state.} }

Jens Eisert found a more efficient version, though for some reason it’s not as well known:

@article{eisert2000oli,
  title={Optimal local implementation of nonlocal quantum gates},
  author={Eisert, J. and Jacobs, K. and Papadopoulos, P. and Plenio, MB},
  journal={Physical Review A},
  volume={62},
  number={5},
  pages={52317},
  year={2000},
  publisher={APS},
  comment={Contains a much more efficient approach to teleported gates
                  than the Gottesman-Chuang approach.} }

Are MDI and CV-QKD feasible over a digital, Bell pair-based Quantum Internet? (Kaushik mentioned this during the presentation very briefly, but I think it needs to be emphasized in the draft.)

CW - The following sentence was added in v08. Please let us know if it addresses your question.
" Note that we still do not have a quantum repeater for the continuous variable systems; hence, this kind of QKD       technologies can be used for the short distance communications or trusted relay-based QKD networks."

Rodney Van Meter
[email-masked]
Professor, Faculty of Environment and Information Studies, Keio University, Japan

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