Quantum data centres: a simulation-based comparative noise analysis

IF 5.6 2区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
K Campbell, A Lawey and M Razavi
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引用次数: 0

Abstract

Quantum data centres (QDCs) could overcome the scalability challenges of modern quantum computers. Single-processor monolithic quantum computers are affected by increased cross talk and difficulty of implementing gates when the number of qubits is increased. In a QDC, multiple quantum processing units (QPUs) are linked together over short distances, allowing the total number of computational qubits to be increased without increasing the number of qubits on any one processor. In doing so, the error incurred by operations at each QPU can be kept small, however additional noise will be added to the system due to the latency cost and errors incurred during inter-QPU entanglement distribution. We investigate the relative impact of these different types of noise using a classically simulated QDC with two QPUs and compare the robustness to noise of the two main ways of implementing remote gates, cat-comm and TP-comm. We find that considering the quantity of gates or inter-QPU entangled links is often inadequate to predict the output fidelity from a quantum circuit and infer that an improved understanding of error propagation during distributed quantum circuits may represent a significant optimisation opportunity for compilation.
量子数据中心:基于模拟的比较噪声分析
量子数据中心(qdc)可以克服现代量子计算机的可扩展性挑战。随着量子比特数量的增加,单处理器单片量子计算机会受到串扰增加和实现门的困难的影响。在量子数据中心中,多个量子处理单元(qpu)在短距离上连接在一起,允许在不增加任何一个处理器上的量子比特数量的情况下增加计算量子比特的总数。这样做可以使每个QPU上的操作产生的误差保持在较小的范围内,但是由于在QPU间纠缠分配过程中产生的延迟成本和错误,会给系统增加额外的噪声。我们使用经典模拟的带有两个qpu的QDC来研究这些不同类型噪声的相对影响,并比较了两种主要实现远程门的方法,cat-comm和TP-comm的对噪声的鲁棒性。我们发现,考虑门或qpu间纠缠链路的数量通常不足以预测量子电路的输出保真度,并推断对分布式量子电路期间错误传播的改进理解可能代表编译的重要优化机会。
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来源期刊
Quantum Science and Technology
Quantum Science and Technology Materials Science-Materials Science (miscellaneous)
CiteScore
11.20
自引率
3.00%
发文量
133
期刊介绍: Driven by advances in technology and experimental capability, the last decade has seen the emergence of quantum technology: a new praxis for controlling the quantum world. It is now possible to engineer complex, multi-component systems that merge the once distinct fields of quantum optics and condensed matter physics. Quantum Science and Technology is a new multidisciplinary, electronic-only journal, devoted to publishing research of the highest quality and impact covering theoretical and experimental advances in the fundamental science and application of all quantum-enabled technologies.
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