论文标题
在二维中被动保护的量子记忆的候选者
Candidate for a passively protected quantum memory in two dimensions
论文作者
论文摘要
量子误差校正领域的一个有趣的问题涉及找到一个托有``被动保护的量子内存''的物理系统，该系统定义为耦合到自然想要纠正错误的环境的编码量子。迄今为止，针对有限温度效应的量子记忆仅在四个空间维度或更高的情况下才知道。在这里，我们采用不同的方法来实现稳定的量子记忆，通过依靠驱动的触觉环境。我们提出了一个新的模型，即光子化模型，该模型似乎在二维的位flip和相叉误差中被动纠正：一个由光子`````cat Qubit''''组成的正方形晶格通过耗散术语耦合的，该术语倾向于在本地修复误差。受两个不同的$ \ mathbb {z} _2 $ - 对称 - 对称性阶段的启发，我们的计划依赖于类似ISING的耗散器来防止位挡板和驱动的分离光子光子环境来防止相位翻转。我们还讨论了实现光子化模型的可能方法。
An interesting problem in the field of quantum error correction involves finding a physical system that hosts a ``passively protected quantum memory,'' defined as an encoded qubit coupled to an environment that naturally wants to correct errors. To date, a quantum memory stable against finite-temperature effects is only known in four spatial dimensions or higher. Here, we take a different approach to realize a stable quantum memory by relying on a driven-dissipative environment. We propose a new model, the photonic-Ising model, which appears to passively correct against both bit-flip and phase-flip errors in two dimensions: A square lattice composed of photonic ``cat qubits'' coupled via dissipative terms which tend to fix errors locally. Inspired by the presence of two distinct $\mathbb{Z}_2$-symmetry-broken phases, our scheme relies on Ising-like dissipators to protect against bit flips and on a driven-dissipative photonic environment to protect against phase flips. We also discuss possible ways to realize the photonic-Ising model.
