评“合理的费米子量子信息理论需要相对论”
Comment on 'Reasonable fermionic quantum information theories require relativity'
摘要：
在[N. Friis，New J. Phys. 18，033014（2016）]考虑了费米子的非相对论描述，特别是奇偶超选择规则在纠缠表征中的作用。一个参数的基础上的自旋统计连接的奇偶超选择规则的物理动机。由于自旋统计联系是在相对论量子力学的背景下推导出来的，因此有人认为，包含宇称超选择规则的动机是洛伦兹不变性。在此基础上进一步论证了费米子量子信息理论与狭义相对论在概念上是不可分割的。在这篇评论中，给出了一个不同的、众所周知的宇称超选择规则的动机，它不依赖于相对论性量子力学的论点，而是使用了物理定律对不同的观察者是相同的假设和无信号原理。
英文摘要：
In [N. Friis, New J. Phys. 18, 033014 (2016)] the non-relativistic description of fermions is considered and in particular the role of the parity superselection rule in relation to the characterization of entanglement. An argument based on the spin-statistics connection is presented as a physical motivation for the parity superselection rule. Since the spin statistics connection was derived in the context of relativistic quantum mechanics it is argued that the inclusion of the parity superselection rule is motivated by Lorentz invariance. Based on this it is further argued that fermionic Quantum Information theory and the theory of special relativity are conceptually inseparable. In this comment a different, and well known, motivation for the parity superselection rule is given that does not rely on arguments from relativistic quantum mechanics, but instead uses the assumptions that the laws of physics are the same for different observers and the no-signalling principle.
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