超导腔中准经典态到任意Fock态叠加态的转换
Converting quasiclassical states into arbitrary Fock state superpositions in a superconducting cavity
摘要：
我们提出并实验证明了一种在超导量子线路中产生任意Fock态叠加的新方法，其中量子比特与微波腔模色散耦合，而不需要精细的频率调谐。在这里，量子比特用于有条件地将相干态的Fock态分量的概率幅度调制为期望的叠加态的概率幅度，而不是像以前的方案那样将光子一个接一个地泵送到腔中。我们的方法不需要在腔态制备过程中调整量子比特频率，并且与以前的方法相比，对噪声和实验误差的积累更具鲁棒性。利用该方法，我们在实验上产生了不同希尔伯特空间维数和压缩态下的高保真相位本征态，这对于量子行走和高精度测量是有用的。
英文摘要：
We propose and experimentally demonstrate a new method to generate arbitrary Fock-state superpositions in a superconducting quantum circuit, where a qubit is dispersively coupled to a microwave cavity mode without the need of fine-frequency tuning. Here the qubit is used to conditionally modulate the probability amplitudes of the Fock state components of a coherent state to those of the desired superposition state, instead of pumping photons one by one into the cavity as in previous schemes. Our method does not require the adjustment of the qubit frequency during the cavity state preparation, and is more robust to noise and accumulation of experimental errors compared to previous ones. Using the method, we experimentally generate high-fidelity phase eigenstates under various Hilbert-space dimensions and squeezed states, which are useful for quantum walk and high-precision measurements.
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