Re: [Qirg] I-D Action: draft-irtf-qirg-quantum-internet-use-cases-02.txt

Gelard Patrick <Patrick.Gelard@cnes.fr> Fri, 09 October 2020 12:41 UTC

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From: Gelard Patrick <Patrick.Gelard@cnes.fr>
To: Wojciech Kozlowski <W.Kozlowski@tudelft.nl>, Chonggang Wang <Chonggang.Wang@InterDigital.com>, "qirg@irtf.org" <qirg@irtf.org>
Thread-Topic: [Qirg] I-D Action: draft-irtf-qirg-quantum-internet-use-cases-02.txt
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Date: Fri, 9 Oct 2020 12:41:23 +0000
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Subject: Re: [Qirg] I-D Action: draft-irtf-qirg-quantum-internet-use-cases-02.txt
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Hi all

Answer in the text [PG]

Best regards
Patrick


-----Message d'origine-----
De : Wojciech Kozlowski <W.Kozlowski@tudelft.nl> 
Envoyé : jeudi 8 octobre 2020 10:34
À : Gelard Patrick <Patrick.Gelard@cnes.fr>fr>; Chonggang Wang <Chonggang.Wang@InterDigital.com>om>; qirg@irtf.org
Objet : RE: [Qirg] I-D Action: draft-irtf-qirg-quantum-internet-use-cases-02.txt

Hi all,

I started going through the new draft and I have some questions that would help me before I progress further:
* I am struggling to understand the difference between Quantum Subnetwork and Quantum Internet. Is the difference the same as between a classical subnetwork and the classical Internet? The definitions in the text are too vague for me.

[PG] I had asked to distinguish between the notions of quantum networks and quantum internet resulting from the analogy with the classical internet (INTER-NETwork).
This distinction should be in accordance with the paragraph "5.4.  Network boundaries" from  the draft Principles for a Quantum Internet". 

For the Classical Internet. In today's Internet, two forms of interconnection model exists between networks: peering and transit. 
The peering is a process where two Internet networks connect and exchange traffic. There are two main types of peering:  Public peering is typically done through an Internet Exchange Point (IXP : https://en.wikipedia.org/wiki/Internet_exchange_point ) and private peering which is when two or more networks agree to exchange their traffic in a private establishment.
Peering cannot be enough for everything, because two operators can simply be too far apart for that [.] We then call on operators who have a larger presence on the planet, the "forwarders". The various forwarders connect to each other through peering agreements and the loop is closed.
When we talk about these subjects from a technical point of view, we sometimes talk about Tier 1, 2 and 3 actors. The largest are the so-called Tier 1 operators ( https://en.wikipedia.org/wiki/Tier_1_network ) . They have developed a long distance network and have direct interconnections with other major operators worldwide. They do not use any transit service to access all of the networks that make up the Internet. 
Example in France https://www.arcep.fr/fileadmin/reprise/observatoire/ipv6/Barometer_of_Data_interconnection_in_France_2020.pdf 

The quantum internet will also be a network of networks where the concept of network interconnection (interconnection of quantum autonomous system) will surely also play an important role. From a technical point of view, different quantum interconnection modes should also emerge from the schemes identified in the paragraph "4.4.1.  Elementary link generation", in order to propagate the entanglement between distinct quantum networks.

* Additionally, some further comments in-line below in response to Patrick's comments.

> -----Original Message-----
> From: Qirg <qirg-bounces@irtf.org> On Behalf Of Gelard Patrick
> Sent: 07 October 2020 16:18
> To: Chonggang Wang <Chonggang.Wang@InterDigital.com>om>; qirg@irtf.org
> Subject: Re: [Qirg] I-D Action: 
> draft-irtf-qirg-quantum-internet-use-cases-
> 02.txt
> 
> Dear Chonggang,
> 
> Somes feedback
> 
> 1/ 4.3.  Control vs Data Plane Classification  The internet draft 
> "Principles for a Quantum Internet" doesn't seem to mention a native 
> quantum control plan (i.e based on quantum communication, E.g quatum ping) :
> 
> Control plane protocols for quantum networks will have  responsibilities
> similar to their classical counterparts, namely   drawing the network topology,
> resource management, populating data   plane tables, etc.  They will not
> manipulate quantum data themselves   and they operate by exchanging
> classical messages only.  Therefore   there is no separate quantum and
> classical control plane.  There is   only one network control plane.
> 
> Should we not make these two documents consistent?
> 

[WK] Patrick is right. It would be beneficial to get these two documents consistent and he is also right that with the latest changes I made I seem to exclude a quantum ping from the control plane. This is worth picking up on. As a start, a question to everybody: is the definition in the principles draft too strict then?

> 2/ 6.2.  Requirements
> In coherence with "Quantum internet: A vision for the road ahead" and 
> "Principles for a Quantum Internet" should it not be necessary to 
> define system metrics making it possible to express the quality of 
> service requirements expected by the quantum applications I.e expected 
> entanglement fidelity,  loss tolerance, error tolerance, Bell pair 
> rate, Bell pair traffic profil (i.e bursty profil. For example if we 
> use satellite LEO to generate Bell pair we may be interested in 
> wanting to know what would be the impact on applications of Bell pair 
> transmission breaks during phases of non-visibility of the satellite 
> by ground stations), latence, time synchronization of nodes, ...  ?
> 

[WK] I think these numbers would be great, but really hard to come up with without a more detailed analysis. However, identifying which stage an application requires is already quite informative in terms of requirements. For example, identifying whether we only need a "quantum memory" stage network vs "fault-tolerant" already tells us a lot.

> Best Regards
> Patrick
> 
> -----Message d'origine-----
> De : Qirg <qirg-bounces@irtf.org> De la part de Chonggang Wang Envoyé :
> mercredi 30 septembre 2020 16:06 À : qirg@irtf.org Objet : Re: [Qirg] 
> I-D
> Action: draft-irtf-qirg-quantum-internet-use-cases-02.txt
> 
> Dear QIRG,
> 
> Quantum internet use cases have been updated to address the comments 
> received during IETF July meeting. Please refer to
> https://urldefense.proofpoint.com/v2/url?u=https-
> 3A__datatracker.ietf.org_doc_draft-2Dirtf-2Dqirg-2Dquantum-2Dinternet-
> 2Duse-2Dcases_&d=DwIFAw&c=XYzUhXBD2cD-CornpT4QE19xOJBbRy-
> TBPLK0X9U2o8&r=xRe3k8UnFVGCjuC7RWUARpslGfYlRaP7D3dVZXHUEVc&m
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> Q9EO9Pg2DpMUILknHf77NGTuuu24Q&e= .
> 
> We would like to get your feedback on this new version and if the use 
> case draft can be considered for next steps.
> 
> Best regards,
> Chonggang
> 
> -----Original Message-----
> From: Qirg <qirg-bounces@irtf.org> On Behalf Of 
> internet-drafts@ietf.org
> Sent: Friday, September 18, 2020 7:46 AM
> To: i-d-announce@ietf.org
> Cc: qirg@irtf.org
> Subject: [Qirg] I-D Action: 
> draft-irtf-qirg-quantum-internet-use-cases-02.txt
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Quantum Internet Research Group RG of 
> the IRTF.
> 
>         Title           : Applications and Use Cases for the Quantum Internet
>         Authors         : Chonggang Wang
>                           Akbar Rahman
>                           Ruidong Li
>                           Melchior Aelmans
> Filename        : draft-irtf-qirg-quantum-internet-use-cases-02.txt
> Pages           : 23
> Date            : 2020-09-18
> 
> Abstract:
>    The Quantum Internet has the potential to improve application
>    functionality by incorporating quantum information technology into
>    the infrastructure of the overall Internet.  In this document, we
>    provide an overview of some applications expected to be used on the
>    Quantum Internet, and then categorize them using various
>    classification schemes.  Some general requirements for the Quantum
>    Internet are also discussed.  The intent of this document is to
>    provide a common understanding and framework of applications and use
>    cases for the Quantum Internet.
> 
> 
> The IETF datatracker status page for this draft is:
> https://urldefense.proofpoint.com/v2/url?u=https-
> 3A__datatracker.ietf.org_doc_draft-2Dirtf-2Dqirg-2Dquantum-2Dinternet-
> 2Duse-2Dcases_&d=DwIFAw&c=XYzUhXBD2cD-CornpT4QE19xOJBbRy-
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> There are also htmlized versions available at:
> https://urldefense.proofpoint.com/v2/url?u=https-
> 3A__tools.ietf.org_html_draft-2Dirtf-2Dqirg-2Dquantum-2Dinternet-2Duse
> -
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> https://urldefense.proofpoint.com/v2/url?u=https-
> 3A__datatracker.ietf.org_doc_html_draft-2Dirtf-2Dqirg-2Dquantum-
> 2Dinternet-2Duse-2Dcases-2D02&d=DwIFAw&c=XYzUhXBD2cD-
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> 
> A diff from the previous version is available at:
> https://urldefense.proofpoint.com/v2/url?u=https-
> 3A__www.ietf.org_rfcdiff-3Furl2-3Ddraft-2Dirtf-2Dqirg-2Dquantum-
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> 
> Please note that it may take a couple of minutes from the time of 
> submission until the htmlized version and diff are available at tools.ietf.org.
> 
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