Physical and logical qubits
In quantum computing, a qubit is a unit of information analogous to a bit in classical computing, but it is affected by quantum mechanical properties such as superposition and entanglement which allow qubits to be in some ways more powerful than classical bits for some tasks.
Connections2
distinguishes between raw hardware and error-corrected information
Fault-tolerant computing relies on mapping multiple physical qubits into a single logical qubit to protect information.
is the unit of information protected by QEC
A logical qubit is an encoded state formed by multiple physical qubits, designed to be robust against the decoherence that affects individual physical qubits.