Gates for one-way quantum computation based on Einstein-Podolsky-Rosen entanglement
Gates for one-way quantum computation based on Einstein-Podolsky-Rosen entanglement
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DOI：
10.1103/physreva.89.032311
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发表时间：
2014-03-10
影响因子：
2.9
通讯作者：
Peng, Kunchi
中科院分区：
文献类型：
--
作者：
Hao, Shuhong;Deng, Xiaowei;Peng, Kunchi
单模压缩和傅里叶变换运算是连续变量量子计算中两个重要的逻辑门，已通过光学四模簇态的方式实验实现。在本文中，我们提出了一种基于使用爱因斯坦-波多尔斯基-罗森二模纠缠态来实现相同操作的更简单、更有效的协议。理论计算和实验结果表明，该方案不仅最大程度地降低了对资源量子态的要求，而且在相同资源条件下显着提高了压缩程度和所得模式的保真度。这是因为在我们的系统中，由于资源状态的不完美挤压而产生的过量噪声的影响被降低了。应用二模纠缠的门操作可以用作未来涉及大规模簇态的量子计算机的基本元素。
Single-mode squeezing and Fourier transformation operations are two essential logical gates in continuous variable quantum computation, which have been experimentally implemented by means of an optical four-mode cluster state. In this paper, we present a simpler and more efficient protocol based on the use of Einstein-Podolsky-Rosen two-mode entangled states to realize the same operations. The theoretical calculations and the experimental results demonstrate that the presented scheme not only decreases the requirement to the resource quantum states at the largest extent but also enhances significantly the squeezing degree and the fidelity of the resultant modes under an identical resource condition. That is because in our system the influence of the excess noises deriving from the imperfect squeezing of the resource states is degraded. The gate operations applying two-mode entanglement can be utilized as a basic element in a future quantum computer involving a large-scale cluster state.