01790nas a2200181 4500000000100000000000100001008004100002260001200043100002200055700001900077700002000096700002100116700002200137245002800159856004800187490000800235520136500243 2021 d c11/20211 aZbigniew Puchała1 aKamil Korzekwa1 aRoberto Salazar1 aPaweł Horodecki1 aKarol Życzkowski00aDephasing superchannels uhttps://doi.org/10.1103/PhysRevA.104.0526110 v1043 a

We characterise a class of environmental noises that decrease coherent properties of quantum channels by introducing and analysing the properties of dephasing superchannels. These are defined as superchannels that affect only non-classical properties of a quantum channel E, i.e., they leave invariant the transition probabilities induced by E in the distinguished basis. We prove that such superchannels ΞC form a particular subclass of Schur-product supermaps that act on the Jamiolkowski state J(E) of a channel E via a Schur product, J′=J∘C. We also find physical realizations of general ΞC through a pre- and post-processing employing dephasing channels with memory, and show that memory plays a non-trivial role for quantum systems of dimension d>2. Moreover, we prove that coherence generating power of a general quantum channel is a monotone under dephasing superchannels. Finally, we analyse the effect dephasing noise can have on a quantum channel E by investigating the number of distinguishable channels that E can be mapped to by a family of dephasing superchannels. More precisely, we upper bound this number in terms of hypothesis testing channel divergence between E and its fully dephased version, and also relate it to the robustness of coherence of E.