Re: [Qirg] renewing I-Ds: comments, please!

[Gelard Patrick <[e-mail]>]

Hi,

https://datatracker.ietf.org/doc/draft-irtf-qirg-principles/

An interesting article that presents in a simple way the key concepts of a quantum Internet.

Some comments :

1/ Quantum Internet will take into account point-to-point communication, but also multipoint communication; So I would have written :

The vision of a quantum Internet is to fundamentally improve Internet technology by allowing quantum communication between any two or more than two points on Earth.


2/ It is written that :

However, it is impossible to entangle two qubits without ever having them directly interact with each other (e.g. by performing a local two-qubit gate, such as the CNOT)


Does this sentence not contradict the paragraph “4.3.3.  Bell Pair links and entanglement swapping”   ? Because with entanglement swapping it is possible to entangle two qubits that never directly interact with each other : https://arxiv.org/abs/quant-ph/0409093 !!!

3/ To achieve teleportation, a Bell Pair needs to be distributed between the source and destination. Thus to teleport a Qubit we need first to distributed a Bell Pair and also use two classical bit. This is not a very effective type of communication because it is consume more resource than the one is transmit, isn’t it ? !!!

4/ 5.3.1.  Goals of a quantum internet.

-          Support distributed quantum applications and Support tomorrow's distributed quantum applications. For example concerning the QKD, there is a great zoology of QKD algorithms ( https://arxiv.org/pdf/1906.01645.pdf ) not necessarily based on the same quantum phenomenon (Heisenberg's uncertainty principle, entanglement) and require different characteristic of quantum channel.   Can an internet quantum communication infrastructure take into account this diversity of needs?

5/ 5.3.2.  The principles of a quantum internet.


-          Bell Pairs are the fundamental building block. Distributed quantum computation need multipartite entangled states shared among several nodes of the network and thus more than  Bell Pairs, isn’t it ? Or the goal is to transforming multipartite entangled states into the tensor product of bipartite Bell pairs between specific nodes using only a certain class of local operations and classical communication ( https://arxiv.org/abs/1907.08019 ) ?


/Patrick