Figure 4

MbQCs for trace distance \({Q}_{{\rm{TD}}}\) and left quantum discord as a function of (a) purity of qubit A, given by \({\rm{tr}}({\rho }_{A}^{2})=(1+{\beta }^{2})\mathrm{/2}\), for Haar random unitary having \({\rm{tr}}({U}_{n}^{2}{\mathrm{)/2}}^{n}\approx 0\), and (b) \(\beta \) for random Hermitian unitary having \({\rm{tr}}({U}_{n}^{2}{\mathrm{)/2}}^{n}\approx 1\).