三角交换-only 旋子的泄漏保护空闲操作
Leakage-protected idle operation of a triangular exchange-only spin qubit
AI总结：
本研究通过精确控制同时开启的全连接交换相互作用，实现了三角交换-only 旋子在泄漏保护空闲点的操作，提升了其相干性能和退相干时间。
摘要：
我们表征了一个三角交换-only (EO) 旋子在泄漏保护空闲 (LPI) 点操作时的相干性。三角几何结构使得可以独立控制所有三个 pairwise 交换相互作用，LPI 条件发生在这些耦合同时开启并调谐到相等强度时。在这种配置中，交换相互作用诱导一个能量间隙 $E_g = 3J/2$，该间隙抑制了计算子空间的泄漏，同时不影响旋子状态。我们开发了校准 LPI 点和测量 $E_g$ 的程序，并利用这些程序表征了在广范围内能量间隙下的旋子退相干时间。尽管使用大始终开启的交换耦合会将旋子暴露于电荷噪声中，我们发现 $\tilde{T}_2^*$ 在 $E_g/h < 60$ MHz 时仍超过传统交换-only 旋子的退相干时间。这里展示的对同时、全连接交换的精确控制为提高 EO 旋子的性能提供了自然路径，也使新型旋子编码成为可能。
英文摘要：
We characterize the coherence of a triangular exchange-only (EO) spin qubit operated at a leakage-protected idle (LPI) point. The triangular geometry enables independent control of all three pairwise exchange interactions, and the LPI condition occurs when these couplings are turned on simultaneously and tuned to equal strength. In this configuration, the exchange interaction induces an energy gap $E_g = 3J/2$ that suppresses leakage from the computational subspace while leaving the qubit state unaffected. We develop procedures to calibrate the LPI point and measure $E_g$, and use these to characterize the qubit dephasing time over a broad range of gap energies. While operating with large always-on exchange couplings exposes the qubit to charge noise, we find that $\tilde{T}_2^*$ still exceeds that of conventional exchange-only spin qubits for $E_g/h < 60$ MHz. The precise control of simultaneous, all-to-all connected exchange demonstrated here presents a natural path towards improving the performance of EO qubits and also enables novel qubit encodings.
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