论文标题
通过量子点模拟器中的鲜明多体定位来保护连贯性免受环境的影响
Protecting coherence from the environment via Stark many-body localization in a Quantum-Dot Simulator
论文作者
论文摘要
半导体平台正在成为一种有前途的架构，用于存储和处理量子信息，例如在量子点旋转量子器中。但是，对于量子计算机，来自电子之间相互作用的电荷噪声是主要限制因素，以及许多量子位的可扩展性。我们表明，可以在半导体量子点阵列中实现磁场梯度，以诱导局部量子相干的动力学$ \ ell- $ bit，其可能用作逻辑量子。这些动态的$ \ ell- $位负责该模型本地化。我们表明，如果电子 - 光子声相互作用不是非本地的，则这些动力学$ \ ell- $位和相应的多体定位受到所有声音的保护，包括所有声音，包括声子。我们进一步显示了基于热化的自我校正逻辑门的实现。这种基于热化的误差校正超出了无腐烂和无噪声子系统的标准范式。因此，我们的工作为基于半导体的量子计算机中的被动量子误差校正打开了一个新的场所。
Semiconductor platforms are emerging as a promising architecture for storing and processing quantum information, e.g., in quantum dot spin qubits. However, charge noise coming from interactions between the electrons is a major limiting factor, along with the scalability of many qubits, for a quantum computer. We show that a magnetic field gradient can be implemented in a semiconductor quantum dot array to induce a local quantum coherent dynamical $\ell-$bit exhibiting the potential to be used as logical qubits. These dynamical $\ell-$bits are responsible for the model being many-body localized. We show that these dynamical $\ell-$bits and the corresponding many-body localization are protected from all noises, including phonons, for sufficiently long times if electron-phonon interaction is not non-local. We further show the implementation of thermalization-based self-correcting logical gates. This thermalization-based error correction goes beyond the standard paradigm of decoherence-free and noiseless subsystems. Our work thus opens a new venue for passive quantum error correction in semiconductor-based quantum computers.
