[aptitude_moo]

Very interesting, I studied telecommunications and I thought the Shannon limit was the absolute limit. I wonder now if this Gordon Holevo limit is applicable for "traditional" telecommunications (like 5G) as opposed to photon counting a deep space probe

EDIT: This paper seems to answer my question [1]

[1] https://opg.optica.org/directpdfaccess/8711ab35-bbc2-4d51-8e...

[adrian_b]

As also explained in the conclusion of the paper linked by you, "photon-counting" detectors are possible only when the energy of one photon is high enough, which happens only for infrared light or for higher frequencies.

"Photon-counting" methods cannot be implemented at frequencies so low as used in 5G networks or in any other traditional radio communications.

[IndrekR]

/at room temperature/

https://en.wikipedia.org/wiki/Johnson%E2%80%93Nyquist_noise

[stracer]

Can you please post another link? This one does not work.

[aptitude_moo]

Weird, it works for me. You can use any of the other published links in the sibling comments. The name of the paper is "Quantum Limits in Optical Communications" by Banaszek

[HappyPanacea]

I think it is https://arxiv.org/abs/2002.05766.

[richarme]

I think it's this one:

https://opg.optica.org/jlt/viewmedia.cfm?uri=jlt-38-10-2741&...

Quantum Limits in Optical Communications

Konrad Banaszek, Ludwig Kunz, Michał Jachura, and Marcin Jarzyna