论文标题
分散量子的超导量子的拉姆西偏置光谱
Ramsey-biased spectroscopy of superconducting qubits under dispersion
论文作者
论文摘要
我们提出了一种光谱法，该方法扩展了Ramsey的原子光谱法，以检测在超导电路上制造的Qubit的过渡频率。该方法使用多间隔的量子偏置列车来实现与入射探针场的替代谐振和分散耦合。随之而来的量子的吸收光谱在其过渡频率下具有较窄的线宽，而不是不断偏向量子到共振而获得的频率，而中间色散进化只会在检测到的频率中可忽略不计。在跨速量尺寸的建模时，我们发现线宽的降低达到23％，而拉姆齐的边缘在分散率与谐振方案的极端持续时间之比同时被抑制。如果该方案通过额外的共振段增强，则可以另外减少37％。
We proposed a spectroscopic method that extends Ramsey's atomic spectroscopy to detect the transition frequency of a qubit fabricated on a superconducting circuit. The method uses a multi-interval train of qubit biases to implement an alternate resonant and dispersive couplings to an incident probe field. The consequent absorption spectrum of the qubit has a narrower linewidth at its transition frequency than that obtained from constantly biasing the qubit to resonance while the middle dispersive evolution incurs only a negligible shift in detected frequency. Modeling on transmon qubits, we find that the linewidth reduction reaches 23% and Ramsey fringes are simultaneously suppressed at extreme duration ratio of dispersion over resonance for a double-resonance scheme. If the scheme is augmented by an extra resonance segment, a further 37% reduction can be achieved.
