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关于1月13日陆朝阳教授学术报告的通知(Physics Department colloquium)

编辑:phydpy 时间:2017年01月11日 访问次数:677

题目:Racing classical computers with quantum boson-sampling machines

报告人:陆朝阳 中国科学技术大学

地点: 教十二-201

时间:113日,周五,15:00-16:00

 

摘要

In this talk, I will report two routes towards experimental BosonSampling with many photons. We developed SPDC two-photon source with simultaneously a collection efficiency of ~70% and an indistinguishability of ~91% between independent photons. With this, we demonstrate genuine and distillable entanglement of ten photons under different pump power [1]. Such a platform will provide enabling technologies for teleportation of multiple properties of photons [2] and efficient scattershot BosonSampling.

Self-assembled InGaAs QDs are in principle deterministic single-quantum emitters with near-unity quantum efficiency and fast decay rate. near-unity indistinguishability [3], and high extraction efficiency, all combined in a single device compatibly and simultaneously [4]. Long streams of >1000 single photons separated by tens of microseconds maintain a >92% indistinguishability, which are shown to be near transform limit [5]. The single photons are used for 3-, 4-, and 5-bosonsampling experiments, more than 24,000 times faster than all pre-vious experiments, and more than 10 times faster than through calculating the matrices permanents using the first  electronic computer (ENIAC) and transistorized computer (TRADIC) in the human history [6].

Our architecture is feasible to be scaled up to a larger number of photons and with higher rate to race against increasingly advanced classical computers in the near term.

References:

[1]      X.-L. Wang et al. Experimental ten-photon entanglement, Phys. Rev. Lett. 117, 210502 (2016).

[2]      X.-L. Wang et al. Quantum teleportation of multiple degrees of freedom of a single photon, Nature 518, 516 (2015).

[3]      Y.-M. He et al. On-demand semiconductor single-photon source with near-unity indistinguishability Nature Nanotechnology 8, 213 (2013).

[4]      X. Ding et al. On-demand single photons with high extraction efficiency and near-unity indistinguishability from a resonantly driven quantum dot in a micropillar, Phys. Rev. Lett. 116, 020401 (2016).

[5]      H. Wang et al. Near transform-limited single photons from an efficient solid-state quantum emitter, Phys. Rev. Lett. 116, 213601 (2016).

[6]      H. Wang et al. Multi-photon boson-sampling machines beating early classical computers, arXiv:1612.06956

 

个人简介:

2000年考入中国科技大学,2011年获英国剑桥大学物理学博士学位, 2011年入选首批中组部“青年千人计划”,2012年入选国家自然科学基金优秀青年项目,2013年入选上海“千人计划” 2014年获得香港求是杰出青年学者奖,2015年获国家杰出青年科学基金资助,2016年入选美国光学学会会士。

陆朝阳现为中国科学技术大学教授、博士生导师,对多光子纠缠、光学量子计算和基于量子点的光子和电子自旋操纵领域的多个关键性问题开展了深入的研究,取得了一系列在国际上有重要影响的实验成果。

 

欢迎老师和同学参加!