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arXiv 2102.04356quant-ph
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通过单光子强度测量来测量双光子位置-动量EPR相关性

Measurement of two-photon position-momentum EPR correlations through single-photon intensity measurements

Abhinandan Bhattacharjee, Nilakantha Meher, Anand K. Jha

摘要:

测量双光子态的位置-动量EPR关联对于从量子密钥分发到符合成像的许多量子信息应用都是非常重要的。然而,用于测量位置-动量EPR相关性的所有现有技术都涉及重合检测,因此存在导致不太准确的测量的问题。在这封信中,我们提出并证明了一个实验方案,不需要符合检测测量EPR的相关性。我们的技术适用于纯的双光子态,无论该状态是可分离的还是纠缠的。我们从理论上证明了,如果纯双光子态满足一定的条件,那么位置-动量EPR关联可以通过仅对其中一个光子进行强度测量来获得。我们实验证明了这种技术的纯双光子状态所产生的I型自发参量下转换,并尽我们所知,我们报告的最准确的测量位置动量EPR相关性到目前为止。

英文摘要:

The measurement of the position-momentum EPR correlations of a two-photon state is important for many quantum information applications ranging from quantum key distribution to coincidence imaging. However, all the existing techniques for measuring the position-momentum EPR correlations involve coincidence detection and thus suffer from issues that result in less accurate measurements. In this letter, we propose and demonstrate an experimental scheme that does not require coincidence detection for measuring the EPR correlations. Our technique works for two-photon states that are pure, irrespective of whether the state is separable or entangled. We theoretically show that if the pure two-photon state satisfies a certain set of conditions then the position-momentum EPR correlations can be obtained by doing the intensity measurements on only one of the photons. We experimentally demonstrate this technique for pure two-photon states produced by type-I spontaneous parametric down-conversion, and to the best of our knowledge, we report the most accurate measurement of position-momentum EPR correlations so far.

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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