Pest detection is a critical issue for farmers and pest analysts and requires immediate response to control the damage. However, one of the current pest control evaluation strategies is to manually mark the pests from the sample image and count them, which is tedious and time-consuming. This paper presents a method to automatically detect and count the number of small yellow thrips (SYT) on lotus leaf back based on YOLO. Due to the natural curved structure of the leaf, some parts of its picture will be out of focus and therefore result in inaccurate counting results. In order to reduce the impact of the out-of-focus area, we first proposed a novel SYT-simulation experiment and then trained the Very-Deep Super-Resolution (VDSR) and Deep plug-and-play super-resolution (DPSR) neural network to enhance the blurred area. With such image enhancement, the final detection rate can be improved from 70.41% to 80.17% after passing a YoLobased object detection network.
Optical quantum memories are important components in the long-distance quantum communication based on quantum repeater protocol. To outperform the direct transmission of light with quantum repeaters, it is crucial to develop quantum memories with high fidelity, high efficiency and long storage time. Recently, we demonstrate that it is feasible to achieve a high storage efficiency of 92% for electromagnetically-induced-transparency (EIT)-based memory with weak coherent signal pulses in cold atomic ensembles [1]. To realize the highly-efficient memory with quantum light, we have built a bright and narrowband photon-pair source which can be locked to atomic transition based on the cavity-enhanced spontaneous parametric down conversion [2]. Here, we present our results on the storage of single photons generated by such a source in EIT-based memories. A storage efficiency of 36% is obtained in initial runs. Future improvements toward a high efficiency are discussed. Such a development paves the way for the applications of photon-pair-based quantum repeater and multi-photon synchronization.
A high-storage efficiency and long-live quantum memory for photons is an essential component for the information processing in long-distance quantum communication and optical quantum computation. We demonstrated a 78% storage efficiency (SE) of coherent light pulses with a cold atomic medium based on the effect of electromagnetically induced transparency (EIT). We also obtained a large fractional delay of 74 at 50% SE, which is the best record to date. The measured fidelity of the memory is better than 90%. The results suggest the EIT light-matter interface can be readily applied to single-photon quantum states. Our work greatly advances the technology of EIT-based quantum memory for the practical quantum information applications.
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