Experimental Quantum Computing without Entanglement
Experimental Quantum Computing without Entanglement
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DOI：
10.1103/physrevlett.101.200501
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发表时间：
2008-11-14
影响因子：
8.6
通讯作者：
White, A. G.
中科院分区：
文献类型：
--
作者：
Lanyon, B. P.;Barbieri, M.;White, A. G.
单纯量子比特的确定性量子计算（DQC 1）是一种使用高度混合态的高效计算模型。与纯态模型不同，它的能量并不来自于大量纠缠的产生。相反，有人提出，其他非经典关联是计算加速的原因，这些关联可以被量子不和谐捕获。在这封信中，我们实现了DQC 1的全光架构，并通过实验观察产生的相关性。我们发现没有纠缠，但大量的量子discord-除了在三种情况下，有效的经典模拟总是可能的。我们的研究结果表明，即使是完全可分离的，高度混合的，状态可以包含内在的量子力学相关性，这些可以提供一个宝贵的资源，量子信息技术。
Deterministic quantum computation with one pure qubit (DQC1) is an efficient model of computation that uses highly mixed states. Unlike pure-state models, its power is not derived from the generation of a large amount of entanglement. Instead it has been proposed that other nonclassical correlations are responsible for the computational speedup, and that these can be captured by the quantum discord. In this Letter we implement DQC1 in an all-optical architecture, and experimentally observe the generated correlations. We find no entanglement, but large amounts of quantum discord-except in three cases where an efficient classical simulation is always possible. Our results show that even fully separable, highly mixed, states can contain intrinsically quantum mechanical correlations and that these could offer a valuable resource for quantum information technologies.