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arXiv 2203.07192quant-ph
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关闭测量设备无关非线性纠缠见证的漏洞

Closing loopholes of measurement-device-independent nonlinear entanglement witnesses

Kornikar Sen, Chirag Srivastava, Ujjwal Sen

AI总结:

本文研究测量设备无关非线性纠缠见证(MDI-NEWs)在检测漏洞和额外量子输入噪声两类实验故障下的响应,给出保证纠缠的效率界限,并识别出仍可保证纠缠的噪声类型,同时比较其与线性对应方法的鲁棒性。

摘要:

纠缠见证的概念构成了一种在现实量子设备中检测纠缠的有用技术。测量设备无关非线性纠缠见证(MDI-NEWs)是一类纠缠见证,它消除了对测量设备正确校准的依赖,从而保证纠缠的存在,并且比其线性对应方法能检测到更多的纠缠态。虽然该方法保证纠缠独立于测量校准,但由于其他漏洞,它们仍然容易产生错误结果。在此,我们研究 MDI-NEWs 对实验中出现的两类故障的响应。在第一类中,研究了检测漏洞,其特征是测量结果事件的丢失和额外增加,并根据所执行测量的效率获得了保证纠缠的界限。在第二类中,我们研究了与 MDI-NEW 场景所需的额外量子输入集合相关的噪声。在这种情况下,识别出一种仍然允许 MDI-NEWs 保证纠缠的噪声类型。我们还表明,在额外量子输入中存在相同噪声的情况下,MDI-NEWs 与其线性对应方法相比,鲁棒性较低或相当,尽管前者在无噪声场景中比其线性同类检测到更大体积的纠缠态。

英文摘要:

The concept of entanglement witnesses form a useful technique to detect entanglement in realistic quantum devices. Measurement-device-independent nonlinear entanglement witnesses (MDI-NEWs) are a kind of entanglement witnesses which eliminate dependence on the correct alignments of measurement devices for guaranteeing the existence of entanglement and also detect more entangled states than their linear counterparts. While this method guarantees entanglement independent of measurement alignments, they are still prone to serving wrong results due to other loopholes. Here we study the response of MDI-NEWs to two categories of faults occurring in experiments. In the first category, the detection loophole, characterized by lost and additional events of outcomes of measurements, is investigated, and bounds which guarantee entanglement are obtained in terms of the efficiency of measurement being performed. In the second category, we study noise associated with the sets of additional quantum inputs required in MDI-NEW scenarios. In this case, a type of noise is identified which still allows the MDI-NEWs to guarantee entanglement. We also show that MDI-NEWs are less or equally robust in comparison to their linear counterparts under the same noise in additional quantum inputs, although the former group detects a larger volume of entangled states in the noiseless scenario than their linear cousins.

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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