Definition: The fundamental unit of quantum information in a quantum computer. Unlike classical bits, which can either be 0 or 1, a qubit can be in a state that represents a superposition of both 0 and 1 simultaneously.
Key Features:
Superposition: A qubit can simultaneously represent both 0 and 1.
Entanglement: Qubits can become entangled, where the state of one qubit can depend on that of another.
Coherence: The ability of a qubit to remain in a quantum state.
Common Applications:
Quantum Computing: Qubits are the building blocks of quantum computers.
Quantum Cryptography: Utilizes the principles of qubits for secure communication.