论文标题
用猫码头计算量子
Quantum computation with cat qubits
论文作者
论文摘要
这些是2019年Les Houches Summer School上的“量子信息机”的讲义。在简要介绍了量子误差校正和骨气码之后，我们关注的是通过非线性多光子驱动的耗散过程稳定的猫量比的情况。我们认为，这样的系统可以看作是一个自我校正的量子，其中位纤维误差被牢固地抑制了。接下来，我们向工程师提供了一些实验方向，并具有超导电路的多光子驱动耗散过程。最后，我们分析了可以实现的各种逻辑门，而无需重新引入位叉误差。这套保存偏见的门为迈向硬件有效且容忍故障的量子处理器铺平了道路。
These are the lecture notes from the 2019 Les Houches Summer School on "Quantum Information Machines". After a brief introduction to quantum error correction and bosonic codes, we focus on the case of cat qubits stabilized by a nonlinear multi-photon driven dissipation process. We argue that such a system can be seen as a self-correcting qubit where bit-flip errors are robustly and exponentially suppressed. Next, we provide some experimental directions to engineer such a multi-photon driven dissipation process with superconducting circuits. Finally, we analyze various logical gates that can be implemented without re-introducing bit-flip errors. This set of bias-preserving gates pave the way towards a hardware-efficient and fault-tolerant quantum processor.
