Entanglement Purification: Cleaning a Noisy Link
Entanglement purification turns several noisy entangled pairs into fewer better ones using local operations and classical communication. How it works.
Qubits are fragile. Surface codes, stabilizers, fault tolerance and error mitigation — the engineering that turns noisy hardware into reliable computation.
68 articlesEntanglement purification turns several noisy entangled pairs into fewer better ones using local operations and classical communication. How it works.
Quantum error mitigation reduces the effect of noise without full error correction. Error types, zero-noise extrapolation and how it differs from QEC.
Quantum error correction codes and methods: error sources, syndrome measurement, Shor and Steane codes, topological codes and fault tolerance.
Quantum error correction codes compared: stabilizer, surface, toric, Bacon-Shor, color and LDPC codes, cat qubits and topological protection.
Why fault-tolerant quantum computing depends on error correction: stabilizer codes, syndromes, surface and toric codes, and experimental progress.
Quantum error correction strategies explained: bit-flip and phase-flip codes, stabilizers, concatenated codes, surface codes and fault tolerance.
Why qubits lose information to noise and decoherence, and how quantum error correction uses redundancy, stabilizers and syndromes to protect it.
How hidden Markov models are mapped onto quantum circuits, how the split HQMM algorithm learns their parameters, and what experiments show so far.