# 量子计算的里程碑：用超算模拟45个量子位（附论文）

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Haner和Steiger使用这台超级计算机模拟了包含30、36、42和45个量子位的量子计算机。在规模最大的一次模拟中，他们使用了0.5PB的内存和8192个节点，实现的性能为每秒0.428千万亿次浮点运算。

Haner和Steiger比较了在性能较弱的超级计算机Edsion上，对30和36个量子位进行模拟的结果。这台超级计算机同样属于劳伦斯伯克利实验室。他们发现，他们的方法同样可以加速计算。“这表明，实现的速度提升并不仅仅是启用新一代硬件（即Cori II超级计算机）的结果。”

# 相关论文

《0.5 Petabyte Simulation of a 45-Qubit Quantum Circuit》

Near-term quantum computers will soon reach sizes that are challenging to directly simulate, even when employing the most powerful supercomputers. Yet, the ability to simulate these early devices using classical computers is crucial for calibration, validation, and benchmarking. In order to make use of the full potential of systems featuring multi- and many-core processors, we use automatic code generation and optimization of compute kernels, which also enables performance portability. We apply a scheduling algorithm to quantum supremacy circuits in order to reduce the required communication and simulate a 45-qubit circuit on the Cori II supercomputer using 8,192 nodes and 0.5 petabytes of memory. To our knowledge, this constitutes the largest quantum circuit simulation to this date. Our highly-tuned kernels in combination with the reduced communication requirements allow an improvement in time-to-solution over state-of-the-art simulators by more than an order of magnitude at every scale.

PDF版本可在量子位微信公众号回复：“45”这个数字下载。

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