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arXiv 0909.0805quant-ph
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贝尔局域态EPR操纵的实验研究

Experimental EPR-Steering of Bell-local States

D. J. Saunders, S. J. Jones, H. M. Wiseman, G. J. Pryde

摘要:

纠缠是量子力学的定义性特征,理解这种现象在基础水平上以及对于量子技术的未来发展至关重要。转向的概念是由薛定谔在1935年提出的,作为爱因斯坦-波多尔斯基-罗森(EPR)悖论的推广。令人惊讶的是,它只是最近才被形式化为具有任意二分态和测量的量子信息任务,对于这种任务,纠缠的存在是必要的,但不是充分的。以前在这一领域的实验仅限于Reid [PRA 40,913]的方法,该方法遵循原始EPR参数,仅考虑每侧两种不同的测量设置。在这里,我们实现了两个以上的设置,以便能够在实验上证明,第一次,EPR转向发生的混合纠缠态是贝尔本地(也就是说,这不可能证明贝尔非局域性)。与贝尔不等式的情况不同,增加测量设置的数量超过两个-我们使用多达六个-显着增加了EPR转向现象对噪声的鲁棒性。

英文摘要:

Entanglement is the defining feature of quantum mechanics, and understanding the phenomenon is essential at the foundational level and for future progress in quantum technology. The concept of steering was introduced in 1935 by Schrödinger as a generalization of the Einstein-Podolsky-Rosen (EPR) paradox. Surprisingly, it has only recently been formalized as a quantum information task with arbitrary bipartite states and measurements, for which the existence of entanglement is necessary but not sufficient. Previous experiments in this area have been restricted to the approach of Reid [PRA 40, 913], which followed the original EPR argument in considering only two different measurement settings per side. Here we implement more than two settings so as to be able to demonstrate experimentally, for the first time, that EPR-steering occurs for mixed entangled states that are Bell-local (that is, which cannot possibly demonstrate Bell-nonlocality). Unlike the case of Bell inequalities, increasing the number of measurement settings beyond two--we use up to six--dramatically increases the robustness of the EPR-steering phenomenon to noise.

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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