Dilation, discrimination and Uhlmann's theorem of link products of quantum channels
Qiang Lei(雷强)1, Liuheng Cao(操刘桁)1, Asutosh Kumar2,‡, and Junde Wu(武俊德)3,†
1 School of Mathematical Sciences, Harbin Institute of Technology, Harbin 150001, China; 2 Department of Physics, Gaya College, Magadh University, Rampur, Gaya 823001, India; 3 School of Mathematical Sciences, Zhejiang University, Hangzhou 310027, China
Abstract We establish the Stinespring dilation theorem of the link product of quantum channels in two different ways, discuss the discrimination of quantum channels, and show that the distinguishability can be improved by self-linking each quantum channel n times as n grows. We also find that the maximum value of Uhlmann's theorem can be achieved for diagonal channels.
Qiang Lei(雷强), Liuheng Cao(操刘桁), Asutosh Kumar, and Junde Wu(武俊德) Dilation, discrimination and Uhlmann's theorem of link products of quantum channels 2024 Chin. Phys. B 33 030304
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