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arXiv 0709.4539quant-ph
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基于小量子寄存器的分布式量子计算

Distributed Quantum Computation Based-on Small Quantum Registers

Liang Jiang, Jacob M. Taylor, Anders S. Sørensen, Mikhail D. Lukin

摘要:

我们描述和分析了一个有效的基于寄存器的混合量子计算方案。我们的方案是基于概率的,预示着本地五量子比特量子寄存器之间的光学连接。我们假设每个寄存器内的高保真本地酉操作,但初始化,测量和纠缠产生的错误概率可能非常高(~5%)。我们证明,我们的计划可以实现确定性的非本地耦合门之间的任意两个寄存器具有非常高的保真度,仅限于从本地酉操作的不完善之处。我们估计了在离子阱或氮空位中心实现量子寄存器的时钟周期和有效错误概率。我们的新方案利用了一种新的有效的两级泵浦方案,原则上可以创建任意高保真的贝尔对。我们引入马尔可夫链模型来研究纠缠抽运的随机过程,并将其映射为确定性过程。最后,我们讨论了实现容错操作与我们的基于寄存器的混合方案的要求,并提出了一种替代方法来容错准备GHZ状态。

英文摘要:

We describe and analyze an efficient register-based hybrid quantum computation scheme. Our scheme is based on probabilistic, heralded optical connection among local five-qubit quantum registers. We assume high fidelity local unitary operations within each register, but the error probability for initialization, measurement, and entanglement generation can be very high (~5%). We demonstrate that with a reasonable time overhead our scheme can achieve deterministic non-local coupling gates between arbitrary two registers with very high fidelity, limited only by the imperfections from the local unitary operation. We estimate the clock cycle and the effective error probability for implementation of quantum registers with ion-traps or nitrogen-vacancy (NV) centers. Our new scheme capitalizes on a new efficient two-level pumping scheme that in principle can create Bell pairs with arbitrarily high fidelity. We introduce a Markov chain model to study the stochastic process of entanglement pumping and map it to a deterministic process. Finally we discuss requirements for achieving fault-tolerant operation with our register-based hybrid scheme, and also present an alternative approach to fault-tolerant preparation of GHZ states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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