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首页> 外文期刊>Physical Review X >Comparing and Combining Measurement-Based and Driven-Dissipative Entanglement Stabilizationsup * /sup
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Comparing and Combining Measurement-Based and Driven-Dissipative Entanglement Stabilizationsup * /sup

机译：基于测量和驱动的耗散缠结稳定 * 的比较和结合。

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摘要

We demonstrate and contrast two approaches to the stabilization of qubit entanglement by feedback. Our demonstration is built on a feedback platform consisting of two superconducting qubits coupled to a cavity, which are measured by a nearly quantum-limited measurement chain and controlled by high-speed classical logic circuits. This platform is used to stabilize entanglement by two nominally distinct schemes: a “passive” reservoir engineering method and an “active” correction based on conditional parity measurements. In view of the instrumental roles that these two feedback paradigms play in quantum error correction and quantum control, we directly compare them on the same experimental setup. Furthermore, we show that a second layer of feedback can be added to each of these schemes, which heralds the presence of a high-fidelity entangled state in real time. This “nested” feedback brings about a marked entanglement fidelity improvement without sacrificing success probability.
机译：我们通过反馈证明和对比两种稳定QUBit纠缠的方法。我们的演示基于由耦合到腔的两个超导Qubits组成的反馈平台，该距离由几乎量子限制的测量链测量并由高速经典逻辑电路控制。该平台用于通过两个名义上独特的方案稳定纠缠：“被动”储层工程方法和基于条件奇偶校验测量的“主动”校正。鉴于这两个反馈范例在量子误差校正和量子控制中发挥的乐器角色，我们直接将它们与同一实验设置进行比较。此外，我们表明可以将第二层反馈层添加到这些方案中的每一个中，其覆盖了实时高保真缠结状态的存在。这种“嵌套”反馈带来了明显的纠缠保真度，而不会牺牲成功概率。

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