Adjusting phase-covariant qubit channel performance with non-unitality
Sign Up to like & getrecommendations! Published in 2022 at "Journal of Physics A: Mathematical and Theoretical"
DOI: 10.1088/1751-8121/acccbf
Abstract: We analyze quantum communication properties of phase-covariant channels depending on their degree of non-unitality. In particular, we derive analytical formulas for the minimal and maximal channel fidelity on pure states and maximal output purity. Next,… read more here.
Keywords: adjusting phase; unitality; phase covariant; non unitality ... See more keywords
Qubit-channel metrology with very noisy initial states
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review A"
DOI: 10.1103/physreva.99.012123
Abstract: We consider an arbitrary qubit channel depending on a single parameter, which is to be estimated by a physical process. Using the quantum Fisher information per channel invocation to quantify the estimation accuracy, we consider… read more here.
Keywords: purity; metrology; initial states; state ... See more keywords