Experimental certification of millions of genuinely entangled atoms in a solid.
Experimental certification of millions of genuinely entangled atoms in a solid.
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DOI：
10.1038/s41467-017-00898-6
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发表时间：
2017-10-13
影响因子：
16.6
通讯作者：
Gisin N
中科院分区：
文献类型：
--
作者：
Fröwis F;Strassmann PC;Tiranov A;Gut C;Lavoie J;Brunner N;Bussières F;Afzelius M;Gisin N
量子理论预测纠缠也可以在宏观物理系统中持续存在，尽管在实验上证明它仍然存在困难。最近，已经取得了重大进展，并报道了多达2900个原子之间的真正纠缠。在这里，我们展示了1600万个真正纠缠的原子在一个固态量子存储器中，该存储器是由单个光子的吸收准备的。我们开发了一个纠缠证人的基础上，结合非经典性质的发射光的定向发射的集体效应，用于量化真正纠缠粒子的数量。该方法适用于广泛的物理系统，即使在有重大损失的情况下也是有效的。我们的研究结果澄清了多体纠缠在基于集合的量子存储器中的作用，并证明了在有限的实验控制下某些类别的多体纠缠的可访问性。众所周知，在宏观系统中纠缠的存在很难观察到。在这里，作者开发了一种见证，使他们能够证明固态量子存储器中数百万个原子之间的纠缠，该存储器由单个光子的预示性吸收准备。
Quantum theory predicts that entanglement can also persist in macroscopic physical systems, albeit difficulties to demonstrate it experimentally remain. Recently, significant progress has been achieved and genuine entanglement between up to 2900 atoms was reported. Here, we demonstrate 16 million genuinely entangled atoms in a solid-state quantum memory prepared by the heralded absorption of a single photon. We develop an entanglement witness for quantifying the number of genuinely entangled particles based on the collective effect of directed emission combined with the non-classical nature of the emitted light. The method is applicable to a wide range of physical systems and is effective even in situations with significant losses. Our results clarify the role of multipartite entanglement in ensemble-based quantum memories and demonstrate the accessibility to certain classes of multipartite entanglement with limited experimental control. The presence of entanglement in macroscopic systems is notoriously difficult to observe. Here, the authors develop a witness which allow them to demonstrate entanglement between millions of atoms in a solid-state quantum memory prepared by the heralded absorption of a single photon.
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影响因子：
64.8
作者：
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通讯作者：
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影响因子：
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