Local discrimination of generalized Bell states via commutativity
arXiv:2111.11275 · doi:10.1103/PhysRevA.105.032455
Abstract
We studied the distinguishability of generalized Bell states under local operations and classical communication. We introduced the concept of maximally commutative set (MCS), subset of generalized Pauli matrices whose elements are mutually commutative and there is no other generalized Pauli matrix that is commute with all the elements of this set. We found that MCS can be considered as a detector for local distinguishability of set of generalized Bell states. In fact, we got an efficient criterion. That is, if the difference set of is disjoint with or completely contain in some MCS, then the set is locally distinguishable. Furthermore, we gave a useful characterization of MCS for arbitrary dimension, which provides great convenience for detecting the local discrimination of generalized Bell states. Our method can be generalized to more general settings which contains lattice qudit basis. Results in [Phys. Rev. Lett. \textbf{92}, 177905 (2004)], [Phys. Rev. A \textbf{92}, 042320 (2015)] and a recent work [arXiv: 2109.07390] can be deduced as special cases of our result.
arXiv comment8 pages, 4 figures, minor modification
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