One Clean Qubit is a concept from quantum computing and quantum information theory that relates to the preparation of quantum states. Specifically, it refers to a quantum resource involving a single qubit that is in a pure state (or "clean"), which can be used in combination with an arbitrary number of other qubits that may be in mixed states or entangled. The significance of the One Clean Qubit resource is that it allows for certain quantum computational tasks to be performed more efficiently.
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