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Continuous-time noise mitigation in analogue quantum simulation
Analogue quantum simulators offer a promising route to explore quantum many-body dynamics beyond classical reach in the near term. However, their vulnerability to noise limits the accuracy of simulations. Here, we establish a continuous-time framework for mitigating noise in analogue quantum simulation. Our protocol fully preserves the continuous-time nature by avoiding any active control or measurement of the system during the dynamics, while achieving exact noise cancellation. This requires a small number of ancillary qubits, whose interaction with the system, combined with classical post-processing of joint measurement data, is tailored to cancel the effect of noise. Furthermore, the protocol is Hamiltonian-independent and robust to realistic ancilla noise. This work points to a promising direction for achieving high-fidelity analogue quantum simulation in the presence of noise. Mitigating errors in analogue quantum simulators - that is, reducing noise-induced bias in expectation values - would greatly improve their operation and scalability. Here, the authors propose a time-continuous error cancellation protocol, based on introducing an auxiliary system and engineering the joint dissipation of the new, extended system.
Nguồn: https://www.nature.com/articles/s41467-026-78310-5. 8 Sync News chỉ tóm tắt và dẫn link; bản quyền nội dung thuộc tác giả và nguồn gốc.
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