Fig. 4: Demonstration of blindness.
From: Multi-client distributed blind quantum computation with the Qline architecture
a Density matrix of the second qubit averaged over all possible \({\theta }_{1}^{{{{{{{{\rm{A}}}}}}}}}\) and \({\theta }_{1}^{{{{{{{{\rm{B}}}}}}}}}\) configurations. b Density matrix of the two-qubit initial state, averaged over all possible values of \({\theta }_{1}^{{{{{{{{\rm{A}}}}}}}}}\) and \({\theta }_{2}^{{{{{{{{\rm{B}}}}}}}}}\).
