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1. Achieving Heisenberg limit in the phase measurement through three-qubit graph states

Author

Bag, Subhasish, Sarkar, Ramita, and Panigrahi, Prasanta K.

Subjects
Quantum Physics, FOS: Physical sciences, Quantum Physics (quant-ph)
Abstract

We study the reciprocal of the mean quantum Fisher information (RMQFI), $\chi^2$ for general three qubit states, having graph and hypergraph states as special cases, for identifying genuine multi party entanglement characterized by $\chi^2 N$. Both the GHZ state and the most symmetric graph state have the highest concurrence equalling 3 and the maximum QFI values., Comment: 11 pages, 5 figures

Published
2022
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