Logical measurement-based quantum computation in circuit-QED
Logical measurement-based quantum computation in circuit-QED
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DOI：
10.1038/s41598-019-52866-3
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发表时间：
2018-08
影响因子：
4.6
通讯作者：
J. Joo;Chang-Woo Lee;S. Kono;Jaewan Kim
中科院分区：
文献类型：
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作者：
J. Joo;Chang-Woo Lee;S. Kono;Jaewan Kim
我们提出了一种基于测量的量子计算（MBQC）的新方案，使用纠错码来防止电路量子电动力学中的光子损失。我们描述了逻辑单量子位门的特定协议，该协议由逻辑 MBQC 的顺序腔测量给出，并且广义薛定谔猫状态用于在微波腔中捕获的连续变量（CV）逻辑量子位。为了在逻辑量子位上应用纠错方案，我们利用称为 qudit 的 AD 维量子系统。假设最初在三个连接腔中制备了三个 CV 量子纠缠态，并且通过与辅助超导量子位耦合的读出谐振器单独控制、操作和测量微波量子态。然后，我们研究了一种实用方法，即如何通过 Jaynes-Cummings 哈密顿量下相邻腔之间的中间超导量子位引起的跨克尔相互作用来创建 CV-qudit 簇状态。这种方法可以扩展用于构建 2D 逻辑簇状态，因此将为超导电路中的逻辑 MBQC 走向容错量子计算铺平一条新途径。
We propose a new scheme of measurement-based quantum computation (MBQC) using an error-correcting code against photon-loss in circuit quantum electrodynamics. We describe a specific protocol of logical single-qubit gates given by sequential cavity measurements for logical MBQC and a generalised Schrödinger cat state is used for a continuous-variable (CV) logical qubit captured in a microwave cavity. To apply an error-correcting scheme on the logical qubit, we utilise ad-dimensional quantum system called a qudit. It is assumed that a three CV-qudit entangled state is initially prepared in three jointed cavities and the microwave qudit states are individually controlled, operated, and measured through a readout resonator coupled with an ancillary superconducting qubit. We then examine a practical approach of how to create the CV-qudit cluster state via a cross-Kerr interaction induced by intermediary superconducting qubits between neighbouring cavities under the Jaynes-Cummings Hamiltonian. This approach could be scalable for building 2D logical cluster states and therefore will pave a new pathway of logical MBQC in superconducting circuits toward fault-tolerant quantum computing.