Quantum error mitigation for fault-tolerant quantum computing
release_ttzylnvp45gqtnrwj2lyhk2h2i
by
Yasunari Suzuki, Suguru Endo, Keisuke Fujii, Yuuki Tokunaga
2021
Abstract
Fault-tolerant quantum computing (FTQC) is a form of universal quantum
computing that suppresses physical errors via quantum error correction (QEC).
Although the effective error rate decreases exponentially with the code
distance, it is expected that the number of available physical qubits and the
T-gate count will be restricted in the early years of FTQC. Meanwhile,
quantum error mitigation (QEM) was recently introduced for suppressing errors
in noisy intermediate-scale quantum (NISQ) devices; it improves the computation
accuracy of near-term quantum algorithms with its overhead being a greater
number of samples. In this work, we integrate QEC and QEM into an efficient
FTQC architecture that effectively increases the code distance and T-gate
count. This scheme will dramatically alleviate the required overheads of FTQC
for achieving high-accuracy quantum computing.
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