Learn clear English definitions for quantum computing fundamentals: qubits, superposition, entanglement, and quantum states.
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A 'qubit' differs from a classical bit in that:
A qubit can be in a superposition of 0 and 1 simultaneously. Upon measurement, it collapses to either 0 or 1 with a certain probability.
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Quantum 'superposition' means that a qubit:
Superposition allows a qubit to be a combination of 0 and 1 simultaneously. This is what enables quantum parallelism in quantum algorithms.
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Quantum 'entanglement' describes a situation where:
Entangled qubits are correlated regardless of distance — measuring one collapses the wavefunction of both, instantly determining their correlated states.
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What is 'decoherence' in quantum computing?
Decoherence is when a quantum system loses its quantum properties by interacting with the external environment — a primary challenge in building stable quantum computers.
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A 'quantum gate' is analogous to:
Quantum gates are the basic operations of quantum circuits — they transform qubit states using unitary matrices, analogous to AND/OR/NOT gates in classical logic.