Quantum Entanglement Calculator
Calculate quantum entanglement measures including concurrence, von Neumann entropy, tangle, and Bell state fidelity.
Inputs
Results
Concurrence
1
Entanglement Entropy
1 bits
Tangle
1
Entanglement of Formation0
Bell State Fidelity100%
P(|00⟩)50%
How to Use This Calculator
- Enter the four two-qubit state amplitudes: |00⟩, |01⟩, |10⟩, and |11⟩. A Bell state (max entanglement) uses |00⟩ = |11⟩ = 1/√2 ≈ 0.707.
- The amplitudes must be normalized: the sum of squares should equal 1. Adjust until the Inner Product is ~1.
- Read Concurrence (0–1): 0 means separable (unentangled), 1 means maximally entangled.
- Entanglement Entropy (bits) gives the von Neumann entropy: 0 for separable, 1 bit for a Bell state.
- Use Bell State Fidelity (%) to check how close your state is to a canonical Bell state.
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Formula
C = 2|a₀₀·a₁₁ - a₀₁·a₁₀|Related Calculators
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