William Wootters is an American physicist known for his contributions to the fields of quantum information theory and quantum mechanics. He is particularly recognized for his work on the concept of quantum entanglement and the theoretical aspects of quantum computation. One of his most notable contributions is the development of the Wootters theory regarding the measurement of qubits and the concept of entanglement measures, such as the "Wootters' concurrence," which helps quantify the degree of entanglement between quantum states.
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A theoretical physicist who, with Scott Hill, developed a calculable measure of quantum entanglement for pairs of qubits. Their 1997 work introduced the concurrence approach and obtained an exact preparation-cost formula for mixed states of rank at most two, with evidence for a broader extension. This turned an optimization over pure-state decompositions into a practical calculation for an important class of small quantum systems.[ref]
Entanglement of a Pair of Quantum Bits by Scott Hill and William K. Wootters. Abstract and equations (3)–(6): rank-two result and magic-basis construction