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Sci Rep. 2016 Jun 7;6:27135. doi: 10.1038/srep27135.

Graph states of prime-power dimension from generalized CNOT quantum circuit.

Author information

1
School of Mathematics and Systems Science, Beihang University, Beijing 100191, China.
2
International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, China.
3
Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

Abstract

We construct multipartite graph states whose dimension is the power of a prime number. This is realized by the finite field, as well as the generalized controlled-NOT quantum circuit acting on two qudits. We propose the standard form of graph states up to local unitary transformations and particle permutations. The form greatly simplifies the classification of graph states as we illustrate up to five qudits. We also show that some graph states are multipartite maximally entangled states in the sense that any bipartition of the system produces a bipartite maximally entangled state. We further prove that 4-partite maximally entangled states exist when the dimension is an odd number at least three or a multiple of four.

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