In quantum computing, a qubit is the fundamental unit of information, analogous to a bit (binary digit) in classical computing, but capable of representing 0, 1, or a superposition of both.
A physical qubit is a real, physical system (like a trapped ion or a superconducting circuit) that can exist in a superposition of states.
A logical qubit is a collection of multiple physical qubits to achieve greater stability and error correction. It's not a physical entity, but a redundant encoding of qubit's quantum state using multiple physical qubits.
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