Superadditivity of quantum channel coding rate with finite blocklength quantum measurements

Hye Won Chung, Lizhong Zheng
2013 2013 51st Annual Allerton Conference on Communication, Control, and Computing (Allerton)  
We investigate superadditivity in the maximum achievable rate of reliable classical communication over a quantum channel. The maximum number of classical information bits extracted per use of the quantum channel strictly increases as the number of channel outputs jointly measured at the receiver increases. This phenomenon is called superadditivity. We provide an explanation of this phenomenon by comparing a quantum channel with a classical discrete memoryless channel (DMC) under concatenated
more » ... es. We also give a lower bound on the maximum accessible information per channel use at a finite length of quantum measurements in terms of V , which is the quantum version of channel dispersion, and C, the classical capacity of the quantum channel.
doi:10.1109/allerton.2013.6736608 dblp:conf/allerton/ChungZ13 fatcat:wuuml2kq6rdorldw42y35kbvxq