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arXiv 1504.03572quant-phcond-mat.mes-hallcond-mat.quant-gascond-mat.supr-con
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自旋系统量子模拟器中纠缠度的实用估算

Practical Entanglement Estimation for Spin-System Quantum Simulators

O. Marty, M. Cramer, M. B. Plenio

摘要:

我们提出了实用的方法来测量纠缠的量子模拟器,可以实现与被困离子,冷原子,超导量子比特。专注于长距离和短距离伊辛型哈密顿量,我们介绍了适用于实际实验条件下的方案,包括混合性,例如,噪音或温度。特别是,我们确定了一个单一的观察,其期望值作为一个下界纠缠,这可能是由一个简单的量子线路。由于这样的电路(尚未)可用于每个平台,我们调查的性能,定期测量的可观测量作为定量纠缠证人。可能的应用包括临界系统中纠缠缩放的实验研究和量子模拟器的可靠基准测试。

英文摘要:

We present practical methods to measure entanglement for quantum simulators that can be realized with trapped ions, cold atoms, and superconducting qubits. Focussing on long- and short-range Ising-type Hamiltonians, we introduce schemes that are applicable under realistic experimental conditions including mixedness due to, e.g., noise or temperature. In particular, we identify a single observable whose expectation value serves as a lower bound to entanglement and which may be obtained by a simple quantum circuit. As such circuits are not (yet) available for every platform, we investigate the performance of routinely measured observables as quantitative entanglement witnesses. Possible applications include experimental studies of entanglement scaling in critical systems and the reliable benchmarking of quantum simulators.

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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