Re: Noise
A few researchers had similar questions and came to the conclusion that yes, Rydberg receivers work for telecom: https://arxiv.org/abs/1808.10839v2
"Prior to the digital test, we have studied the RF-receiving quality versus the physical ambiance and found that a choice of linear gain response to the RF-amplitude can suppress the signal distortion and the modulating signal is able to be decoded as fast as up to 500 kHz in the tunable bandwidth. Our checkout consolidates the physical foundation for a reliable communication and spectrum sensing over the broadband RF-carrier."
Beside that, also consider the work by NIST cited in the article (https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=927743) and the one by BT (https://ieeexplore.ieee.org/document/9492845/authors) the one of Rydberg Technologies, an american company which is already marketing Rydberg cells for other, similar, applications: https://arxiv.org/abs/1808.08589 and the ongoing work at NASA, https://www.nasa.gov/directorates/spacetech/niac/2022/Cryospheric_Rydberg_Radar/