🛠️ Error Mitigation Techniques
Reduce quantum errors without full error correction
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Fault-Tolerant Quantum Computing
🛠️ The NISQ Solution
Full quantum error correction requires thousands of physical qubits per logical qubit—far beyond today's capabilities. Error mitigation offers a practical alternative: reduce errors through classical post-processing and clever measurement strategies, without the massive overhead of QEC.
💡 Why Mitigation?
For NISQ (Noisy Intermediate-Scale Quantum) devices with 50-1000 qubits, error mitigation bridges the gap between noisy hardware and useful computation. It's the pragmatic approach for near-term quantum advantage.
🎯 What You'll Master
📈
Zero-Noise Extrapolation
Amplify noise and extrapolate backwards
🎲
Probabilistic Cancellation
Invert noise through sampling
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Measurement Mitigation
Calibrate and correct readout
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Practical Strategy
When and how to apply each method
⚖️ Mitigation vs Error Correction
🛠️Error Mitigation
Qubit overhead:None
Time overhead:2-100×
Error reduction:10-100×
Scalability:Limited
🛡️Full QEC
Qubit overhead:100-1000×
Time overhead:10-100×
Error reduction:Exponential
Scalability:Unlimited
🔧 Main Techniques
Zero-Noise Extrapolation2-5×
Amplify noise and extrapolate to zero
Probabilistic Error Cancellation10-1000×
Invert noise via sampling
Clifford Data Regression5-20×
Learn noise from simpler circuits
Measurement Mitigation1.2-2×
Correct readout errors