A **quantum register** is a fundamental concept in quantum computing, analogous to a classical register in classical computing. It is a collection of quantum bits, or qubits, which are the basic units of quantum information. ### Key Features of Quantum Registers: 1. **Qubits**: Each quantum register consists of qubits. Unlike classical bits, which can be either 0 or 1, qubits can exist in a superposition of states.
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A quantum register is a named tensor product factor of a quantum circuit's Hilbert space, usually a collection of qubits. Registers separate data, control, output and workspace roles; uncomputation returns workspace to a fixed quantum state without destroying coherence in the data.