Wollmann Sabine, Uola Roope, Costa Ana C S
Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Bristol BS8 1FD, United Kingdom.
Centre for Quantum Computation and Communication Technology (Australian Research Council), Centre for Quantum Dynamics, Griffith University, Brisbane, Queensland 4111, Australia.
Phys Rev Lett. 2020 Jul 10;125(2):020404. doi: 10.1103/PhysRevLett.125.020404.
We analyze and experimentally demonstrate quantum steering using criteria based on generalized entropies and criteria with minimal assumptions based on the so-called dimension-bounded steering. Further, we investigate and compare their robustness against experimental imperfections such as misalignment in the shared measurement reference frame. While entropy based criteria are robust against imperfections in state preparation, we demonstrate an advantage in dimension-bounded steering in the presence of measurement imprecision. As steering with such minimal assumptions is easier to reach than fully nonlocal correlations, and as our setting requires very little trust in the measurement devices, the results provide a candidate for the costly Bell tests while remaining highly device independent.
我们基于广义熵准则以及基于所谓维度受限导引且假设最少的准则，对量子导引进行了分析和实验验证。此外，我们研究并比较了它们针对诸如共享测量参考系失准等实验缺陷的鲁棒性。虽然基于熵的准则对于态制备中的缺陷具有鲁棒性，但我们证明在存在测量不精确性的情况下，维度受限导引具有优势。由于这种假设最少的导引比完全非局域关联更容易实现，并且由于我们的设置对测量设备的信任要求很低，所以这些结果为代价高昂的贝尔测试提供了一个候选方案，同时保持高度的设备无关性。
