The efficiencies of generating cluster states with weak nonlinearities
The efficiencies of generating cluster states with weak nonlinearities
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DOI：
10.1088/1367-2630/9/6/193
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发表时间：
2006-07
影响因子：
3.3
通讯作者：
Sebastien G. R. Louis;Sebastien G. R. Louis;K. Nemoto;W. Munro;W. Munro;T. Spiller
中科院分区：
文献类型：
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作者：
Sebastien G. R. Louis;Sebastien G. R. Louis;K. Nemoto;W. Munro;W. Munro;T. Spiller
我们提出了一种可扩展的方法来建立集群状态的物质量子比特使用相干态的光。最近关于这个主题的工作依赖于在测量过程中使用单个光子量子比特。这些方案可以对探测器损耗、自发发射和腔失配具有鲁棒性，但结果是开销成本迅速增长，特别是在考虑单光子损耗时。相比之下，我们的方法使用连续变量和高效的零差测量。我们提出了一个双量子比特方案，一个简单的桶测量系统产生一个纠缠操作的成功概率为1/2。然后我们将其扩展到三量子比特相互作用，将此概率增加到3/4。我们讨论的开销成本和时间缩放的重要问题。这导致了一个“无测量”的方法来建立集群状态，利用相空间中的几何相位。
We propose a scalable approach to building cluster states of matter qubits using coherent states of light. Recent work on the subject relies on the use of single photonic qubits in the measurement process. These schemes can be made robust to detector loss, spontaneous emission and cavity mismatching but as a consequence the overhead costs grow rapidly, in particular when considering single photon loss. In contrast, our approach uses continuous variables and highly efficient homodyne measurements. We present a two-qubit scheme, with a simple bucket measurement system yielding an entangling operation with success probability 1/2. Then we extend this to a three-qubit interaction, increasing this probability to 3/4. We discuss the important issues of the overhead cost and the time scaling. This leads to a ‘no-measurement’ approach to building cluster states, making use of geometric phases in phase space.