Conclusive quantum steering with superconducting transition-edge sensors.

Conclusive quantum steering with superconducting transition-edge sensors.
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DOI:
10.1038/ncomms1628
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发表时间:
2012-01-10
影响因子:
16.6
通讯作者:
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中科院分区:
综合性期刊1区
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量子操纵允许双方验证共享的纠缠,即使一个测量设备是不可信的。通过违反操纵不等式的操纵的结论性演示具有相当大的基本兴趣,并开辟了量子通信中的应用。到目前为止,所有单光子状态的实验测试都依赖于后选择,允许不受信任的设备通过隐藏损失中的不利事件来作弊。在这里,我们关闭这个'检测漏洞'相结合的纠缠光子对超导过渡边缘传感器的高效源。我们实现了前所未有的纠缠光子的62%的条件探测效率,并违反了一个操纵不等式,测量设置的最小数量为48 s.d.s.我们的研究结果提供了一个明确的路径转向的实际应用和光子无环孔贝尔测试。不可信的源或探测器意味着量子纠缠不能总是被确保,但量子操纵不等式可以验证它的存在。使用高效的系统,Smith等人能够关闭检测漏洞,并清楚地展示双方之间的转向。
Quantum steering allows two parties to verify shared entanglement even if one measurement device is untrusted. A conclusive demonstration of steering through the violation of a steering inequality is of considerable fundamental interest and opens up applications in quantum communication. To date, all experimental tests with single-photon states have relied on post selection, allowing untrusted devices to cheat by hiding unfavourable events in losses. Here we close this 'detection loophole' by combining a highly efficient source of entangled photon pairs with superconducting transition-edge sensors. We achieve an unprecedented ∼62% conditional detection efficiency of entangled photons and violate a steering inequality with the minimal number of measurement settings by 48 s.d.s. Our results provide a clear path to practical applications of steering and to a photonic loophole-free Bell test. Untrustworthy sources or detectors mean that quantum entanglement cannot always be ensured, but quantum steering inequalities can verify its presence. Using a highly efficient system, Smith et al. are able to close the detection loophole and clearly demonstrate steering between two parties.
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