Quantum Computing vs. Coherent Computing
Quantum Computing vs. Coherent Computing
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DOI：
10.1007/s00354-012-0403-5
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发表时间：
2012-10-01
影响因子：
2.6
通讯作者：
Utsunomiya, Shoko
中科院分区：
文献类型：
--
作者：
Yamamoto, Yoshihisa;Takata, Kenta;Utsunomiya, Shoko
在这篇评论文章中，我们比较了两种计算系统的性能：量子计算和相干计算。最近讨论了一种采用表面编码量子纠错的电路模型量子计算的分层结构。使用这个具体的硬件平台，它是可能的，以执行容错量子计算的素数分解和分子本征能量计算，不能解决目前的计算系统的资源分析。一个特定的量子计算系统可以使用10（8）-10（9）个物理量子比特在1-10天的时间尺度上解决这些问题，我们讨论了一种基于注入锁定激光网络wnicn的替代计算系统，这里称之为相干计算系统。一个三维伊辛模型映射到相互注入锁定的从激光器网络，而独立的注入信号从主激光器实现塞曼哈密顿。在该计算系统中，采用向上或向下状态的伊辛自旋由每个从激光器中的激射光子的偏振自由度（右圆偏振或左圆偏振）表示。自旋-自旋耦合系数由连接两个从激光器的简单线性偏振光学器件实现。我们数值研究了所提出的机器对反铁磁伊辛模型与不同的问题大小M的标度律。达到稳态极化配置的瞬态时间与锁定带宽成反比，并且在M=1000之前不强烈依赖于问题大小。
In this review article, we compare the performance of two computing systems: quantum computing and coherent computing. A layered architecture for circuit-model quantum computing, employing surface code quantum error correction, has been recently discussed. Using this concrete hardware platform, it is possible to provide resource analysis for executing the fault-tolerent quantum computing for prime number factoring and molecular eigen-energy calculation that cannot be solved by the present day computing systems. A particular quantum computing system could solve such problems on the time scale of 1-10 days by using 10(8) - 10(9) physical qubits.We discuss an alternative computing system based on an injection-locked laser network wnicn is called a coherent computing system here. A three-dimensional Ising model is mapped onto the mutually injection-locked slave laser network, while the independent injection signal from a master laser implements a Zeeman Hamiltonian. In this computing system, an Ising spin taking either up or down state is represented by the polarization degrees of freedom, right or left circular polarizations, of the lasing photons in each slave laser. A spin-spin coupling coefficient is implemented by simple linear polarization optics connecting the two slave lasers. We numerically study the scaling law of the proposed machine against the anti-ferromagnetic Ising model with varying problem size M. A transient time to reach a steady state polarization configuration is inversely proportional to the locking bandwidth and does not depend on the problem size strongly up to M=1000.