I think it's this one: https://opg.optica.org/jlt/viewmedia.cfm?uri=jlt-38-10-2741&seq=0 https://opg.optica.org/jlt/viewmedia.cfm?uri=jlt-38-10-2741&... Quant

I think it's this one: https://opg.optica.org/jlt/viewmedia.cfm?uri=jlt-38-10-2741&seq=0 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