5 papers
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…
Universal Robust Quantum Gates via Doubly Geometric Control
Hai Xu, Tao Chen, Junkai Zeng +5
Geometric quantum computation offers a potential route to fault-tolerant quantum information processing by exploiting the global nature of geometric phases. However, achieving cont…
Entanglement-Induced Resilience of Quantum Dynamics
Tianfeng Feng, Yue Cao, Wenjun Yu +4
Quantum many-body devices suffer from imperfections that destabilize dynamics and limit scalability. We show that the dynamical growth of entanglement can intrinsically protect gen…
Fundamental Costs of Noise-Robust Quantum Control: Speed Limits and Complexity
Junkai Zeng, Xiu-Hao Deng
Noise is ubiquitous in quantum systems and is a major obstacle for the advancement of quantum information science. Noise-robust quantum control achieves high-fidelity operations by…
Geometric correspondence of noisy quantum dynamics and universal robust quantum gates
Yong-Ju Hai, Junning Li, Junkai Zeng +1
Quantum information processing faces a significant hurdle: noise. Different noise sources induce varying errors in quantum operations depending on the underlying dynamics. To gain…