Physical and logical qubits
In quantum computing, a qubit is a unit of information analogous to a bit (binary digit) 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. Qubits are used in quantum circuits and quantum algorithms composed of quantum logic gates to solve computational problems, where they are used for input/output and intermediate computations.
Quantum information
In physics and computer science, quantum information is the information of the state of a quantum system; it is the basic entity of study in quantum information theory, and can be manipulated using quantum information processing techniques. Quantum information, like classical information, can be processed using digital computers, transmitted from one location to another, manipulated with algorithms, and analyzed with the computer science mathematics. While the fundamental unit of classical information is the bit, the most basic unit of quantum information is the qubit.