Microwave boson sampling
Borja Peropadre Email: Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States Gian Giacomo Guerreschi Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States Joonsuk Huh Mueunjae Institute for Chemistry (MIC), Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea Alán Aspuru-Guzik Email: Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
Abstract
The first post-classical computation will most probably be performed not on a universal quantum computer, but rather on a dedicated quantum hardware. A strong candidate for achieving this is represented by the task of sampling from the output distribution of linear quantum optical networks. This problem, known as boson sampling, has recently been shown to be intractable for any classical computer, but it is naturally carried out by running the corresponding experiment. However, only small scale realizations of boson sampling experiments have been demonstrated to date. Their main limitation is related to the non-deterministic state preparation and inefficient measurement step. Here, we propose an alternative setup to implement boson sampling that is based on microwave photons and not on optical photons. The certified scalability of superconducting devices indicates that this direction is promising for a large-scale implementation of boson sampling and allows for more flexible features like arbitrary state preparation and efficient photon-number measurements.
中文速览
玻色采样虽被认为经典计算机难以模拟，却受限于光子难以确定性制备和高效率探测，现有实验很难扩展到大规模。论文提出改用微波光子，在超导电路中用高品质谐振器存储光子、可调超导环实现分束，用量子比特确定性制备光子并调节相位，再通过量子非破坏测量读取每个模式的光子数。结果表明，这套方案能以高保真度制备单光子甚至更复杂的量子态，快速切换光子耦合，并实现高效、可扩展的测量，所需组件基本都已在现有超导器件中得到验证。它为展示量子计算超越经典的玻色采样提供了更现实的硬件路线，也可能直接用于分子振动光谱等量子模拟。
原文 arXiv:1510.08064;中英对照 + 大白话阅读 https://aha.fim.ai/paper/1510.08064v1