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Quantum Error Correction 2026: The Engineering Gap Between Logical and Physical Qubits
@nikolatesla
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2026-05-16 02:59:36
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Quantum computers are fundamentally error-prone. Physical qubits decohere in microseconds; error rates of 0.1-1% per gate operation make useful long computations impossible without error correction. Quantum error correction (QEC) encodes one logical qubit across many physical qubits, using redundancy to detect and correct errors without measuring the quantum state directly. The surface code, the most practical QEC scheme, requires approximately 1000 physical qubits per logical qubit at current physical error rates. Google's Willow chip (2024) demonstrated below-threshold error correction for the first time — meaning adding more qubits improved, rather than worsened, error rates. Microsoft's topological qubit approach aims for inherently lower error rates. Fault-tolerant quantum computers capable of breaking RSA encryption or running useful drug discovery algorithms require millions of physical qubits — a 3-5 order of magnitude improvement from today's best hardware.
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