论文标题
改进了Qubit耦合的Gottesman-Kitaev-Preskill国家的读数
Improved readout of qubit-coupled Gottesman-Kitaev-Preskill states
论文作者
论文摘要
谐波振荡器中Qubit编码的Gottesman-Kitaev-Preskill是一个有前途的构建块，朝向容忍缺陷的量子计算。最近，该编码是在陷阱离子和超导电路系统中首次实验证明的。但是，这些系统缺乏一些高斯操作，这些操作对于有效地操纵编码量子的操作至关重要。特别是，同性恋检测是读取编码量子的首选方法，不容易获得，从而严重限制了读数保真度。在这里，我们提出了一种为Qubit耦合系统设计的替代读取策略。我们的方法可以通过几个数量级来改善此类系统的读数保真度，而且令人惊讶的是，在低挤压方案中甚至超过了同伴检测的忠诚度。
The Gottesman-Kitaev-Preskill encoding of a qubit in a harmonic oscillator is a promising building block towards fault-tolerant quantum computation. Recently, this encoding was experimentally demonstrated for the first time in trapped-ion and superconducting circuit systems. However, these systems lack some of the Gaussian operations which are critical to efficiently manipulate the encoded qubits. In particular, homodyne detection, which is the preferred method for readout of the encoded qubit, is not readily available, heavily limiting the readout fidelity. Here, we present an alternative read-out strategy designed for qubit-coupled systems. Our method can improve the readout fidelity with several orders of magnitude for such systems and, surprisingly, even surpass the fidelity of homodyne detection in the low squeezing regime.
