Experimental optimal single qubit purification in an NMR quantum information processor.
Experimental optimal single qubit purification in an NMR quantum information processor.
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核磁共振量子信息处理器中的实验最佳单量子位纯化
DOI：
10.1038/srep06857
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发表时间：
2014-10-31
影响因子：
4.6
通讯作者：
Long GL
中科院分区：
文献类型：
--
作者：
Hou SY;Sheng YB;Feng GR;Long GL
高质量的单量子位是量子信息处理的构建模块。但它们很容易受到环境噪音的影响。为了克服噪声，已经提出了从纯度较低的量子位生成纯度较高的量子位的纯化技术。纯化引起了人们极大的兴趣并得到了广泛的研究。然而，由 Cirac、Ekert 和 Macchiavello 提出的最佳单量子位纯化方案的完整实验演示 [Phys.莱特牧师。 82, 4344 (1999)，CEM 协议] 几十年前，仍然是一个实验挑战，因为它需要更复杂的网络和更高水平的精确控制。在这项工作中，我们设计了一个实验方案，通过波函数的显式对称化来实现 CEM 协议。该纯化方案已在核磁共振量子信息处理器中成功实施。该实验充分证明了纯化方案，并表明它是保护量子位免受错误和退相干影响的有效方法。
High quality single qubits are the building blocks in quantum information processing. But they are vulnerable to environmental noise. To overcome noise, purification techniques, which generate qubits with higher purities from qubits with lower purities, have been proposed. Purifications have attracted much interest and been widely studied. However, the full experimental demonstration of an optimal single qubit purification protocol proposed by Cirac, Ekert and Macchiavello [Phys. Rev. Lett. 82, 4344 (1999), the CEM protocol] more than one and half decades ago, still remains an experimental challenge, as it requires more complicated networks and a higher level of precision controls. In this work, we design an experiment scheme that realizes the CEM protocol with explicit symmetrization of the wave functions. The purification scheme was successfully implemented in a nuclear magnetic resonance quantum information processor. The experiment fully demonstrated the purification protocol and showed that it is an effective way of protecting qubits against errors and decoherence.
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