A primer on quantum error mitigation
Current generation quantum computers are severely limited by hardware noise, which leads to biased and unreliable measurement outcomes. Quantum error correction (QEC) in principle allows one to suppress this noise and realize fault tolerant quantum computation, but its resource overhead is far beyond what today’s noisy intermediate scale quantum (NISQ) devices can support. This raises a central question: how can we reduce the impact of noise before full fault tolerance is available?
This talk provides a primer on quantum error mitigation: a set of algorithmic techniques that reduce noise induced bias in expectation values at the cost of additional circuit executions and classical post processing, without requiring logical qubits.
Topics of the talk:
Quantum noise processes
Noise tailoring and randomized compiling
Zero-noise extrapolation
Probabilistic error cancellatio