Open quantum systems can exhibit inherently mixed quantum orders, such as strong-to-weak spontaneous symmetry breaking (SW-SSB), which have no analogue in pure states. It is generally expected that a finite-depth local quantum channel cannot induce a phase transition to SW-SSB in one spatial dimension. We circumvent th...
Christopher Fechisin, Tsung-Cheng Lu, Zhi-Yuan Wei et al.· 0 citations
Hamiltonian learning provides a systematic framework for reconstructing unknown quantum dynamics. However, existing protocols typically assume direct measurement access to the entire system. With fast single-qubit control and a connected reference backbone, we show that a single measurable qubit suffices to learn all $...
Su-Ying Liu, Zi-Tai Xu, Alexey V. Gorshkov et al.· 0 citations
Quantum error mitigation relies on accurate noise characterization, but mismatches between the actual and characterized noise can be amplified and drive a sharp threshold between successful and failed mitigation. In random circuits, this threshold maps onto a random-field Ising transition, but previous exact numerics w...
Jia-Yao Zhao, Zhi-Yuan Wei, M. Gullans· 0 citations
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