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quant-ph2026
Estimating the concurrence for quantum states via symmetric measurements
Hao-Fan Wang, Wen Zhou, Lin Chen +1
We derive improved lower bounds of concurrence induced by symmetric measurements, which retains experimental feasibility without state tomography. More importantly, we resolve a re…
quant-ph2026
Non-Perturbative Geometric Framework for Single-Qubit Gates under Always-On Couplings
Junkai Zeng, Lin Chen, Xiu-Hao Deng
In qubit arrays with always-on couplings, single-qubit gates pose a control challenge often as demanding as entangling operations. The same interactions that enable two-qubit entan…