Re: [Qirg] Review of draft-irtf-qirg-principles-06

[Wojciech Kozlowski <[e-mail]>]

Hi John,

Thanks for your feedback! Apologies for the delay - I was waiting to see if more feedback arrives after the last call so that I could address all of them in one go.

Github diff: https://github.com/Wojtek242/draft-irtf-qirg-principles/commit/96067861320826ce8a75bf38bab4cd360b364f3c

Replies in-line below. I left out two of your suggestions. However, if others agree with those two points, let me know, and I'll incorporate them.

Wojtek

> -----Original Message-----
> From: Qirg <[e-mail]> On Behalf Of John Mattsson
> Sent: 11 March 2021 11:09
> To: [e-mail]
> Subject: [Qirg] Review of draft-irtf-qirg-principles-06
> 
> Hi,
> 
> I think this document is very well-written. It is also a very useful document. I
> have some comments below but otherwise I think this document is ready for
> WGLC and publication.
> 
> Cheers,
> John
> 
> 
> 
> - Abstract:
> "The first realisations of quantum networks are imminent"
> 
> My understanding is that several quantum networks have been built in the
> past.
> One by DARPA in Massachusetts 2001 and one in Vienna 2003 to name a
> few...
> https://urldefense.proofpoint.com/v2/url?u=https-
> 3A__en.wikipedia.org_wiki_Quantum-
> 5Fnetwork&d=DwICAg&c=XYzUhXBD2cD-CornpT4QE19xOJBbRy-
> TBPLK0X9U2o8&r=xRe3k8UnFVGCjuC7RWUARpslGfYlRaP7D3dVZXHUEVc&m
> =JjIraP3t060tJhFYfYDD_Dq5vZBTobY4U7kxyArRc9s&s=HxacZxiood58Hsl0odcR
> YJreezpnltqpcW--xUUcilQ&e=
> I think the sentence needs to be reformulated.
> 

 [WK] Rephrased to "quantum entanglement networks" 

> 
> - Section 1:
> OLD "such as secure communications"
> NEW "such as quantum cryptography"
> 
> Talking about "communication" is quite limiting. It like saying that
> classic crypto is all about communication. There are a lot of
> exciting quantum cryptography research that may turn out to be
> practically useful in the future.
> https://urldefense.proofpoint.com/v2/url?u=https-
> 3A__en.wikipedia.org_wiki_Quantum-
> 5Fcryptography&d=DwICAg&c=XYzUhXBD2cD-CornpT4QE19xOJBbRy-
> TBPLK0X9U2o8&r=xRe3k8UnFVGCjuC7RWUARpslGfYlRaP7D3dVZXHUEVc&m
> =JjIraP3t060tJhFYfYDD_Dq5vZBTobY4U7kxyArRc9s&s=_OX5epJ9iPFcDUZQu0
> 3bkjxdIvku6D-hIYnZfM4Jrso&e=
> 
> 
> - Section 2.1:
> 
> "a |0> + b |1>"
> 
> Would maybe be good to mention that a and b are complex
> 

 [WK] It does already say that

> 
> - Section 4.1.2. No-cloning theorem
> 
> I think the document need to explain that it is still possible to produce
> imperfect copies.
> Might also be good to mention some other theorems like the no-
> communication theorem, no-teleportation theorem, no-deletion theorem...
> Especially no-communication theorem, no-teleportation theorem would be
> good to mention with a few sentences each.
> 

[WK] I'm not so sure. I've been trying to avoid going too deep into the details to keep the document high-level. I could include it if others support this modification though.

> 
> - Section 4.4.1
> 
> "since photons cannot be stored"
> 
> Maybe change to "photons are hard to store". A easy way to "store" a
> photon for a short period of time is to send it through a local optical fibre
> loop.
> 

[WK] Done

> 
> - Section 4.4.2
> 
> "10s of kms in optical fibre or 1000 kms in free space"
> 
> Reformulate to use "kilometers" or "km". Using plural in the unit seems very
> non-SI compliant.
> 

[WK] Done

> 
> - Section 5.3.2
> 
> "Quantum routers" vs. "Quantum repeater"
> 
> This section defines "Quantum router" as a special kind of quantum repeater.
> Quantum Repeater is not defined in this section but used much more than
> quantum router in the document. Seems like the term "quantum repeater"
> should be defined.
> 

[WK] Repeaters are defined when discussing entanglement swapping and then used multiple times. I'm not sure a definition here would add much. I can add something if others find this confusing as well.

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