Day 20: QuCode’s 21 Days Quantum Computing Challenge
Today’s topic of study: Noise, Error Correction & NISQ Era Computing
Subtopics: Quantum error correction, Decoherence
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What I leant today,
Quantum error correction: Qubits can be built using photons, ions, atoms, and superconductors, each with unique control mechanisms. The core challenge is quantum error, states easily cab be easily disrupted by environmental noise. Using logical qubits encoded across multiple physical qubits to detect and correct errors without collapsing the quantum state is quantum error correction. Physical qubits deviate from ideal two-level systems due to noise, decoherence, and imperfect gates. We can break down quantum errors into X , Z , and Y types, and any unitary error can be decomposed into these.
Decoherence: is the process by which a quantum system loses its superposition and entanglement properties, makeing it to behave like a classical system. It occurs when a quantum system interacts with its surrounding environment, causing the system’s quantum information to leak into the environment’s many degrees of freedom. This continuous interaction essentially performs a type of measurement, destroying the system’s quantum state and making it to collapse into a single classical outcome.
