Winnel Matthew S, Guanzon Joshua J, Singh Deepesh, Ralph Timothy C
Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, University of Queensland, St Lucia, Queensland 4072, Australia.
Phys Rev Lett. 2024 Jun 7;132(23):230602. doi: 10.1103/PhysRevLett.132.230602.
Large-amplitude squeezed cat states and high-quality Gottesman-Kitaev-Preskill (GKP) states are essential for effective quantum error correction, yet their optical preparation has been hindered by challenges such as low success probabilities, small amplitudes, and insufficient squeezing. Addressing these limitations, our research introduces scalable optical schemes for the deterministic preparation of large-amplitude squeezed cat states from photon-number states. Fock states have the benefit of producing consistent cat states across all measurement outcomes and intrinsically provides a degree of squeezing. Notably, these squeezed cat states facilitate the deterministic generation of high-quality approximate GKP states via "breeding," showing that GKP error correction in optics is technically feasible in near-term experiments. Our schemes allow fault-tolerant quantum computation through the use of GKP error correction.
大振幅压缩猫态和高质量的戈特斯曼-基塔耶夫-普雷斯基尔（GKP）态对于有效的量子纠错至关重要，然而它们的光学制备一直受到诸如成功率低、振幅小和压缩不足等挑战的阻碍。为了解决这些限制，我们的研究引入了可扩展的光学方案，用于从光子数态确定性地制备大振幅压缩猫态。福克态具有在所有测量结果中产生一致猫态的优点，并且本质上提供了一定程度的压缩。值得注意的是，这些压缩猫态通过“培育”促进了高质量近似GKP态的确定性生成，表明光学中的GKP纠错在近期实验中在技术上是可行的。我们的方案允许通过使用GKP纠错进行容错量子计算。
