Coherence manipulation with dephasing-covariant operations
Bartosz Regula, Varun Narasimhachar, Francesco Buscemi, Mile Gu · Physical Review Research · 2020
Quantum coherence, or superposition, is a signature feature of non-classicality in quantum mechanics. This work investigates the ultimate limitations imposed on coherence manipulation with quantum channels that are unable to detect it, which can be understood as intrinsically classical operations. The authors establish rules governing such transformations, comparing different approaches to coherence non-detecting operations and showing that they are asymptotically equivalent.