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arXiv 1509.00860quant-phcond-mat.supr-con
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基于测量和驱动耗散的纠缠稳定化的比较与结合

Comparing and combining measurement-based and driven-dissipative entanglement stabilization

Yehan Liu, Shyam Shankar, Nissim Ofek, Michael Hatridge, Anirudh Narla, Katrina Sliwa, Luigi Frunzio, Robert J. Schoelkopf, Michel H. Devoret

摘要:

我们展示并对比了两种通过反馈来稳定量子比特纠缠的方法。我们的演示建立在一个反馈平台上,该平台由两个超导量子比特耦合到一个腔体组成,该腔体由近量子限制的测量链测量,并由高速经典逻辑电路控制。这个平台是用来稳定纠缠的两个名义上不同的计划:一个“被动”水库工程方法和“主动”校正的基础上有条件的奇偶测量。鉴于这两种反馈范式在量子纠错和量子控制中所起的作用,我们在相同的实验装置上直接比较了它们。此外,我们表明,第二层反馈可以添加到这些方案中的每一个,这预示着一个高保真纠缠态的实时存在。这种“嵌套”反馈在不牺牲成功概率的情况下带来了显着的纠缠保真度改善。

英文摘要:

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. Further, 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 realtime. This "nested" feedback brings about a marked entanglement fidelity improvement without sacrificing success probability.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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