High-performance optical quantum memories serving as quantum nodes are crucial for the distribution of remote entanglement and the construction of large-scale quantum networks.Notably,quantum systems based on single e...High-performance optical quantum memories serving as quantum nodes are crucial for the distribution of remote entanglement and the construction of large-scale quantum networks.Notably,quantum systems based on single emitters can achieve deterministic spin–photon entanglement,which greatly simplifies the difficulty of constructing quantum network nodes.Among them,optically interfaced spins embedded in solid-state systems,as atomic-like emitters,are important candidate systems for implementing long-lived quantum memory due to their stable physical properties and robustness to decoherence in scalable and compact hardware.To enhance the strength of light-matter interactions,optical microcavities can be exploited as an important tool to generate high-quality spin–photon entanglement for scalable quantum networks.They can enhance the photon collection probability and photon generation rate of specific optical transitions and improve the coherence and spectral purity of emitted photons.For solid-state systems,open Fabry–Pérot cavities can couple single emitters that are not in proximity to the surface,avoiding significant spectral diffusion induced by the interfaces while maintaining the wide tunability,which enables addressing of multiple single emitters in the frequency and spatial domain within a single device.This review described the characteristics of single emitters as quantum memories with a comparison to atomic ensembles,the cavity-enhancement effect for single emitters and the advantages of different cavities,especially fiber Fabry–Pérot microcavities.Finally,recent experimental progress on solid-state single emitters coupled with fiber Fabry–Pérot microcavities was also reviewed,with a focus on color centers in diamond and silicon carbide,as well as rare-earth dopants.展开更多
In this paper, a novel method for fixed-node quantum Monte Carlo is given. We have derived an expansion of the eigenvalue of the energy for a system and proved that the value of the energy calculated using the tradit...In this paper, a novel method for fixed-node quantum Monte Carlo is given. We have derived an expansion of the eigenvalue of the energy for a system and proved that the value of the energy calculated using the traditional fixed-node quantum Monte Carlo method is only the zero order approximation of the eigenvalue of the energy. But when using our novel method, in the case of only increasing less computing amounts (<1%), we can obtain conveniently the first order approximation, second order approximation, and so on. We have calculated the values of the zero, first and second approximation (0, 1 and 2) of the energies of 11A1 state of CH2, 1Ag (C4h, acet) state of C8 and the ground-state of H2O using this novel method. The results indicate that for 11A1 state of CH2, 1Ag (C4h, acet) state of C8 and the ground-state of H2O it needs only the second order approximation to obtain electronic correlation energy with over 97%. This demonstrates that this novel method is very excellent in both the computing accuracy and the amount of calculation required.展开更多
近几年,大道数高密度采集已经成为全球地震勘探行业的标配,传统的勘探方法正面临着越来越多的限制和挑战。随着勘探技术的不断更新和各种理论的完善,如何将新技术应用到现代地震勘探中,以提高地震队的生产质量和效率,为勘探提供优质的...近几年,大道数高密度采集已经成为全球地震勘探行业的标配,传统的勘探方法正面临着越来越多的限制和挑战。随着勘探技术的不断更新和各种理论的完善,如何将新技术应用到现代地震勘探中,以提高地震队的生产质量和效率,为勘探提供优质的地震数据资料,正在成为整个石油勘探行业的关注重点。Hyper Q(Long range QC,远距离节点QC传输)质控系统是Quantum节点在野外生产采集的主要质量控制监控手段,其兼容性高,可安装于无人机和机动车辆上,收取范围广,功耗低并具备多路径传输等特点,极大提高了当前地震队对于Quantum节点的质量监控能力,为节点技术的推广带来了新的发展机遇,本文重点讨论了Hyper Q无人机质控系统在阿曼项目中的应用效果。展开更多
基金supported by the Innovation Program for Quantum Science and Technology(No.2021ZD0301200)the National Natural Science Foundation of China(Nos.12222411,11821404 and 12204459)Anhui Provincial Natural Science Foundation(No.2108085QA26).
文摘High-performance optical quantum memories serving as quantum nodes are crucial for the distribution of remote entanglement and the construction of large-scale quantum networks.Notably,quantum systems based on single emitters can achieve deterministic spin–photon entanglement,which greatly simplifies the difficulty of constructing quantum network nodes.Among them,optically interfaced spins embedded in solid-state systems,as atomic-like emitters,are important candidate systems for implementing long-lived quantum memory due to their stable physical properties and robustness to decoherence in scalable and compact hardware.To enhance the strength of light-matter interactions,optical microcavities can be exploited as an important tool to generate high-quality spin–photon entanglement for scalable quantum networks.They can enhance the photon collection probability and photon generation rate of specific optical transitions and improve the coherence and spectral purity of emitted photons.For solid-state systems,open Fabry–Pérot cavities can couple single emitters that are not in proximity to the surface,avoiding significant spectral diffusion induced by the interfaces while maintaining the wide tunability,which enables addressing of multiple single emitters in the frequency and spatial domain within a single device.This review described the characteristics of single emitters as quantum memories with a comparison to atomic ensembles,the cavity-enhancement effect for single emitters and the advantages of different cavities,especially fiber Fabry–Pérot microcavities.Finally,recent experimental progress on solid-state single emitters coupled with fiber Fabry–Pérot microcavities was also reviewed,with a focus on color centers in diamond and silicon carbide,as well as rare-earth dopants.
基金This research work was supported by the National Natural Science Foundation of China(No.29773036)Science Foundation of the Education Committee of Hunan.
文摘In this paper, a novel method for fixed-node quantum Monte Carlo is given. We have derived an expansion of the eigenvalue of the energy for a system and proved that the value of the energy calculated using the traditional fixed-node quantum Monte Carlo method is only the zero order approximation of the eigenvalue of the energy. But when using our novel method, in the case of only increasing less computing amounts (<1%), we can obtain conveniently the first order approximation, second order approximation, and so on. We have calculated the values of the zero, first and second approximation (0, 1 and 2) of the energies of 11A1 state of CH2, 1Ag (C4h, acet) state of C8 and the ground-state of H2O using this novel method. The results indicate that for 11A1 state of CH2, 1Ag (C4h, acet) state of C8 and the ground-state of H2O it needs only the second order approximation to obtain electronic correlation energy with over 97%. This demonstrates that this novel method is very excellent in both the computing accuracy and the amount of calculation required.
文摘近几年,大道数高密度采集已经成为全球地震勘探行业的标配,传统的勘探方法正面临着越来越多的限制和挑战。随着勘探技术的不断更新和各种理论的完善,如何将新技术应用到现代地震勘探中,以提高地震队的生产质量和效率,为勘探提供优质的地震数据资料,正在成为整个石油勘探行业的关注重点。Hyper Q(Long range QC,远距离节点QC传输)质控系统是Quantum节点在野外生产采集的主要质量控制监控手段,其兼容性高,可安装于无人机和机动车辆上,收取范围广,功耗低并具备多路径传输等特点,极大提高了当前地震队对于Quantum节点的质量监控能力,为节点技术的推广带来了新的发展机遇,本文重点讨论了Hyper Q无人机质控系统在阿曼项目中的应用效果。
