In this paper, we characterize the saturation of four universal inequalities in quantum information theory, including a variant version of strong subadditivity inequality for von Neumann entropy, the coherent informat...In this paper, we characterize the saturation of four universal inequalities in quantum information theory, including a variant version of strong subadditivity inequality for von Neumann entropy, the coherent information inequality, the Holevo quantity, and average entropy inequalities. These results shed new light on quantum information inequalities.展开更多
For a pure non-markovian dephasing model we derive analytic expressions of coherent information,quantum discord,and entanglement.We find that for the cases of the initial Werner states,the dynamical behavior of cohere...For a pure non-markovian dephasing model we derive analytic expressions of coherent information,quantum discord,and entanglement.We find that for the cases of the initial Werner states,the dynamical behavior of coherent information is similar to that of quantum discord but different from that of entanglement.Coherent information,as well as quantum discord,can reveal the quantum correlations in some mixed-states,in which the entanglement is zero.展开更多
Channel capacity is a core problem in information theory. The capacity of a classical channel is essentially characterized by maximum transmission rate of classical information. However, in quantum information theory,...Channel capacity is a core problem in information theory. The capacity of a classical channel is essentially characterized by maximum transmission rate of classical information. However, in quantum information theory, several capacities can be defined for a quantum channel based on the type of information being sent.展开更多
基金Supported by National Natural Science Foundation of China under Grant Nos.11301124,11171301the Doctoral Programs Foundation of Ministry of Education of China under Grant No.J20130061
文摘In this paper, we characterize the saturation of four universal inequalities in quantum information theory, including a variant version of strong subadditivity inequality for von Neumann entropy, the coherent information inequality, the Holevo quantity, and average entropy inequalities. These results shed new light on quantum information inequalities.
基金Supported by National Science Foundation of China under Grant Nos. 11005008,10974016,and 11075013
文摘For a pure non-markovian dephasing model we derive analytic expressions of coherent information,quantum discord,and entanglement.We find that for the cases of the initial Werner states,the dynamical behavior of coherent information is similar to that of quantum discord but different from that of entanglement.Coherent information,as well as quantum discord,can reveal the quantum correlations in some mixed-states,in which the entanglement is zero.
基金supported by the National Natural Science Foundation of China(Grant Nos.61671280,and 11531009)the Natural Science Basic Research Plan in Shaanxi Province of China(Grant No.2017KJXX-92)+1 种基金the Fundamental Research Funds for the Central Universities(Grant No.GK201502004)the Funded Projects for the Academic Leaders and Academic Backbones,Shaanxi Normal University(Grant No.16QNGG013)
文摘Channel capacity is a core problem in information theory. The capacity of a classical channel is essentially characterized by maximum transmission rate of classical information. However, in quantum information theory, several capacities can be defined for a quantum channel based on the type of information being sent.
