No-Go Theorems for Quantum Resource Purification: New Approach and Channel Theory

  title={No-Go Theorems for Quantum Resource Purification: New Approach and Channel Theory},
  author={Kun Fang and Zi-Wen Liu},
  journal={PRX Quantum},
It is recently shown that there exist fundamental limits to the accuracy and efficiency of purifying generic noisy resource states in any well-behaved quantum resource theory [Fang/Liu, Phys. Rev. Lett. 125, 060405 (2020)]. Here, we develop a novel and powerful method for analyzing the limitations of quantum resource purification, which not only leads to improved bounds that rule out exact purification for a broader range of noisy states and are tight in certain cases, but also allow us to… 

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