论文标题
弱调节体系结构中受到错误保护的跨质子开关
An error-protected cross-resonance switch in weakly-tuneable architectures
论文作者
论文摘要
在由微波脉冲激活的两倍门中，通过打开或关闭脉冲，量子状态交换在纠缠或闲置模式之间。在这两种模式下，杂散耦合的存在使Qubits会累积相干相误差。但是，这两种模式中的错误率有所不同，因为粒子在每种模式下具有不同的流量耦合强度。因此，从一种模式中消除杂散耦合不会将其从另一个模式中删除。我们建议将这样的门与可调的耦合器相结合，并表明怠速和纠缠量子都可以摆脱流浪耦合。这显着增加了量子算法中的操作开关保真度。我们进一步提出了一个弱调节的量子，作为最佳耦合器，以将两种模式彼此参与。这可以通过减少其泄漏来增强调整过程。
In two-qubit gates activated by microwave pulses, by turning pulse on or off, the state of qubits are swapped between entangled or idle modes. In either mode, the presence of stray couplings makes qubits accumulate coherent phase error. However, the error rates in the two modes differ because qubits carry different stray coupling strengths in each mode; therefore, eliminating stray coupling from one mode does not remove it from the other. We propose to combine such a gate with a tunable coupler and show that both idle and entangled qubits can become free from stray couplings. This significantly increases the operational switch fidelity in quantum algorithms. We further propose a weakly-tunable qubit as an optimum coupler to bring the two modes parametrically near each other. This remarkably enhances the tuning process by reducing its leakage.
