Quantum Discord & Separability Witness — Two-Qubit System

Quantum discord measures quantum correlations beyond entanglement: even separable mixed states can have non-zero discord. The Bloch sphere visualization shows a two-qubit X-state density matrix, with real-time computation of entanglement (concurrence), discord, and the PPT separability criterion.

X-State Parameters

Coherence r: 0.60 Bias p: 0.20 Correlation c: 0.40 Dephasing γ: 0.30

Quantum Measures

Concurrence C:—

Discord D:—

Classical Corr:—

Mutual Info:—

PPT criterion:—

Min eigenval ρᵀᴮ:—