High-Fidelity CZ Gates in Double Quantum Dot – Circuit QED Systems Beyond the Rotating-Wave Approximation
arxiv(2024)
摘要
Semiconductor double quantum dot (DQD) qubits coupled via superconducting
microwave resonators provide a powerful means of long-range manipulation of the
qubits' spin and charge degrees of freedom. Quantum gates can be implemented by
parametrically driving the qubits while their transition frequencies are
detuned from the resonator frequency. Long-range two-qubit CZ gates have been
proposed for the DQD spin qubit within the rotating-wave approximation (RWA).
Rapid gates demand strong coupling, but RWA breaks down when coupling strengths
become significant relative to system frequencies. Therefore, understanding the
detrimental impact of time-dependent terms ignored by RWA is critical for
high-fidelity operation. Here, we go beyond RWA to study CZ gate fidelity for
both DQD spin and charge qubits. We propose a novel parametric drive on the
charge qubit that produces fewer time-dependent terms and show that it
outperforms its spin counterpart. We find that drive amplitude - a parameter
dropped in RWA - is critical for optimizing fidelity and map out high-fidelity
regimes. Our results demonstrate the necessity of going beyond RWA in
understanding how long-range gates can be realized in DQD qubits, with charge
qubits offering considerable advantages in high-fidelity operation.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要