Entanglement monotones are a class of measures used in quantum information theory to quantify the amount of entanglement present in a quantum state. The key properties that define an entanglement monotone include: 1. **Non-negativity**: An entanglement monotone must be non-negative for all quantum states. In essence, it should assign a value of zero to separable states (states that are not entangled) and a positive value to entangled states.
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