Papers › Geometric correspondence of noisy quantum dynamics and universal robust quantum gates
Geometric correspondence of noisy quantum dynamics and universal robust quantum gates
Yong-Ju Hai, Junning Li, Junkai Zeng, Xiu-Hao Deng
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Quantum information processing faces a significant hurdle: noise. Different noise sources induce varying errors in quantum operations depending on the underlying dynamics. To gain a deeper understanding of these error mechanisms, we introduce the concept of Quantum Error Evolution Diagrams (QEED). These QEEDs establish a dual correspondence between driven noisy quantum dynamics and geometric space curves, offering quantitative geometric metrics to assess the severity of these errors. This theory provides a framework for designing universal robust quantum gates to correct the errors induced by generic noises. Furthermore, we present a protocol for constructing a universal set of single- and two-qubit robust quantum gates. These gates, designed with simple and smooth control pulses of arbitrary length, achieve fidelities exceeding 99.99\% across a wide range of noise strengths. This geometric approach offers significant advantages over existing methods. Overall, our work provides new insights into the geometric nature of noisy quantum dynamics and paves the way for the development of approaches to dynamically correct quantum errors.
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