Heralded quantum steering over a high-loss channel.

Heralded quantum steering over a high-loss channel.
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DOI:
10.1126/sciadv.1701230
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发表时间:
2018-01
期刊:
影响因子:
13.6
通讯作者:
Pryde GJ
Pryde GJ
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Weston MM;Slussarenko S;Chrzanowski HM;Wollmann S;Shalm LK;Verma VB;Allman MS;Nam SW;Pryde GJ

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纠缠交换使验证的非局部相关性在一个高损失的通道与检测漏洞关闭。纠缠态是许多远程量子信息任务的关键资源,包括安全通信和量子物理的基本测试。这些任务需要对共享纠缠进行强有力的验证,但在长距离上执行它目前在技术上是棘手的,因为通过光纤或自由空间信道的损失打开了检测漏洞。我们设计并实验证明了一个方案,该方案在至少14.8 ± 0.1 dB的附加损耗的存在下验证纠缠,相当于大约80 km的电信光纤。我们的协议依赖于纠缠交换来预示有损信道后光子的存在,从而实现量子操纵的事件就绪实现。这一结果克服了现实高损耗场景下设备无关通信和量子中继器实现中的关键障碍。
Entanglement swapping enables verified nonlocal correlations over a high-loss channel with the detection loophole closed. Entanglement is the key resource for many long-range quantum information tasks, including secure communication and fundamental tests of quantum physics. These tasks require robust verification of shared entanglement, but performing it over long distances is presently technologically intractable because the loss through an optical fiber or free-space channel opens up a detection loophole. We design and experimentally demonstrate a scheme that verifies entanglement in the presence of at least 14.8 ± 0.1 dB of added loss, equivalent to approximately 80 km of telecommunication fiber. Our protocol relies on entanglement swapping to herald the presence of a photon after the lossy channel, enabling event-ready implementation of quantum steering. This result overcomes the key barrier in device-independent communication under realistic high-loss scenarios and in the realization of a quantum repeater.
DOI: 10.1103/physrevlett.115.250402
发表时间: 2015-12-18
影响因子: 8.6
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Shalm LK;Meyer-Scott E;Christensen BG;Bierhorst P;Wayne MA;Stevens MJ;Gerrits T;Glancy S;Hamel DR;Allman MS;Coakley KJ;Dyer SD;Hodge C;Lita AE;Verma VB;Lambrocco C;Tortorici E;Migdall AL;Zhang Y;Kumor DR;Farr WH;Marsili F;Shaw MD;Stern JA;Abellán C;Amaya W;Pruneri V;Jennewein T;Mitchell MW;Kwiat PG;Bienfang JC;Mirin RP;Knill E;Nam SW
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