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arXiv · 1803.04696

Time-resolved boson sampling with photons of different colors

Xu-Jie Wang·Bo Jing·Peng-Fei Sun·Chao-Wei Yang·Yong Yu·Vincenzo Tamma·Xiao-Hui Bao·Jian-Wei Pan
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Abstract

Interference of multiple photons via a linear-optical network has profound applications for quantum foundation, quantum metrology and quantum computation. Particularly, a boson sampling experiment with a moderate number of photons becomes intractable even for the most powerful classical computers, and will lead to "quantum supremacy". Scaling up from small-scale experiments requires highly indistinguishable single photons, which may be prohibited for many physical systems. Here we experimentally demonstrate a time-resolved version of boson sampling by using photons not overlapping in their frequency spectra from three atomic-ensemble quantum memories. Time-resolved measurement enables us to observe nonclassical multiphoton correlation landscapes. An average fidelity over several interferometer configurations is measured to be 0.936(13), which is mainly limited by high-order events. Symmetries in the landscapes are identified to reflect symmetries of the optical network. Our work thus provides a route towards quantum supremacy with distinguishable photons.

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Xu-Jie Wang, Bo Jing, Peng-Fei Sun, Chao-Wei Yang, Yong Yu, Vincenzo Tamma, Xiao-Hui Bao, Jian-Wei Pan. 2018-03-13. Time-resolved boson sampling with photons of different colors. https://doi.org/10.1103/physrevlett.121.080501

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