Robust and versatile black-box certification of quantum devices.
Robust and versatile black-box certification of quantum devices.
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DOI：
10.1103/physrevlett.113.040401
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发表时间：
2014-06
影响因子：
8.6
通讯作者：
Tzyh Haur Yang;T. Vértesi;J. Bancal;V. Scarani;M. Navascués
中科院分区：
文献类型：
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作者：
Tzyh Haur Yang;T. Vértesi;J. Bancal;V. Scarani;M. Navascués
自测试是指这样的事实，即在一些量子设备中，状态和测量都可以在黑盒场景中进行评估，仅基于观察到的统计数据，即，而不参考任何先前的设备校准。只有少数几个自我测试的例子是已知的，他们只是提供了不切实际的设备执行接近理想情况下的非平凡的评估。我们克服了这些困难，接近自我测试与半定编程层次的量子相关性的表征。这使我们能够显著提高以前的自测试方案的鲁棒性;例如，我们证明了大于2.57的Clauser-Horne-Shimony-Holt破坏证明了大于70%的单线态保真度。此外，该工具的多功能性带来了迄今为止不可能的情况下的自我测试，如强大的自我测试的非最大纠缠的两个quutrit状态在柯林斯-吉辛-林登-马萨-波佩斯库的情况。
Self-testing refers to the fact that, in some quantum devices, both states and measurements can be assessed in a black-box scenario, on the sole basis of the observed statistics, i.e., without reference to any prior device calibration. Only a few examples of self-testing are known, and they just provide nontrivial assessment for devices performing unrealistically close to the ideal case. We overcome these difficulties by approaching self-testing with the semidefinite programing hierarchy for the characterization of quantum correlations. This allows us to improve dramatically the robustness of previous self-testing schemes; e.g., we show that a Clauser-Horne-Shimony-Holt violation larger than 2.57 certifies a singlet fidelity of more than 70%. In addition, the versatility of the tool brings about self-testing of hitherto impossible cases, such as the robust self-testing of nonmaximally entangled two-qutrit states in the Collins-Gisin-Linden-Massar-Popescu scenario.