Duration: 55:29

1,204 views

14

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. Using a QD coupled to a micropillar, we produced single photons with high purity, 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 previous 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