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Passive decoy-state quantum key distribution using weak coherent pulses with modulator attenuation
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作者 李源 鲍皖苏 +2 位作者 李宏伟 周淳 汪洋 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第11期118-124,共7页
Passive decoy-state quantum key distribution is more desirable than the active one in some scenarios. It is also affected by the imperfections of the devices. In this paper, the influence of modulator attenuation on t... Passive decoy-state quantum key distribution is more desirable than the active one in some scenarios. It is also affected by the imperfections of the devices. In this paper, the influence of modulator attenuation on the passive decoy-state method is considered. We introduce and analyze the unbalanced Mach-Zehnder interferometer, briefly, and combining with the virtual source and imaginary unitary transformation, we characterize the passive decoy-state method using a weak coherent photon source with modulator attenuation. According to the attenuation parameter 6, the pass efficiencies are given. Then, the key generation rate can be acquired. From numerical simulations, it can be seen that modulator attenuation has a non- negligible influence on the performance of passive-state QKD protocol. Based on the research, the analysis method of virtual source and imaginary unitary transformation are preferred in analyzing passive decoy state protocol, and the passive decoy-state method is better than the active one and is close to the active vacuum + weak decoy state under the condition of having the same modulator attenuation. 展开更多
关键词 quantum key distribution passive decoy state modulator attenuation weak coherent pulses
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Experimental demonstration of passive decoy state quantum key distribution
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作者 张阳 王双 +5 位作者 银振强 陈巍 梁文烨 李宏伟 郭光灿 韩正甫 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第10期97-100,共4页
Passive decoy state quantum key distribution(PDS-QKD) has advantages in high-speed scenarios.We propose a modified model to simulate the PDS-QKD with a weak coherent light source based on Curty's theory [Opt.Lett.3... Passive decoy state quantum key distribution(PDS-QKD) has advantages in high-speed scenarios.We propose a modified model to simulate the PDS-QKD with a weak coherent light source based on Curty's theory [Opt.Lett.34 3238(2009)].The modified model can provide better performance in a practical PDS-QKD system.Moreover,we report an experimental demonstration of the PDS-QKD of over 22.0-dB channel loss. 展开更多
关键词 quantum key distribution passive decoy state method
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Experimental demonstration of passive decoy state quantum key distribution
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作者 张阳 王双 +5 位作者 银振强 陈巍 梁文烨 李宏伟 郭光灿 韩正甫 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第10期101-104,共4页
Passive decoy state quantum key distribution(PDS-QKD) has advantages in high-speed scenarios.We propose a modified model to simulate the PDS-QKD with a weak coherent light source based on Curty’s theory [Opt.Lett.34 ... Passive decoy state quantum key distribution(PDS-QKD) has advantages in high-speed scenarios.We propose a modified model to simulate the PDS-QKD with a weak coherent light source based on Curty’s theory [Opt.Lett.34 3238(2009)].The modified model can provide better performance in a practical PDS-QKD system.Moreover,we report an experimental demonstration of the PDS-QKD of over 22.0-dB channel loss. 展开更多
关键词 quantum key distribution passive decoy state method
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Organic-inorganic hybrid hole transport layers with SnS doping boost the performance of perovskite solar cells 被引量:1
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作者 Xiaolu Zheng Haibing Wang +6 位作者 Feihong Ye Cong Chen Weijun Ke Wenjing Zhang Chuanxin He Yanlong Tai Guojia Fang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第5期637-645,共9页
Perovskite solar cells(PSCs) have demonstrated excellent photovoltaic performance which currently rival the long-standing silicon solar cells’ efficiency. However, the relatively poor device operational stability of ... Perovskite solar cells(PSCs) have demonstrated excellent photovoltaic performance which currently rival the long-standing silicon solar cells’ efficiency. However, the relatively poor device operational stability of PSCs still limits their future commercialization. Binary sulfide is a category of materials with promising optoelectrical properties, which shows the potential to improve both the efficiency and stability of PSCs.Here we demonstrate that the inorganic tin monosulfide(Sn S) can be an efficient dopant in 2,2’,7,7’-tet rakis(N,N-di-p-methoxy-phenylamine)-9,9’-spirobifluorene(spiro-OMe TAD) to form a composite hole transport layer(HTL) for PSCs. Sn S nanoparticles(NPs) synthesized through a simple chemical precipitation method exhibit good crystallization and suitable band matching with the perovskites. The introduction of Sn S NPs in Spiro-OMTAD HTLs enhanced charge extraction, reduced trap state density, and shallowed trap state energy level of the devices based on the composite HTLs. Therefore, the resulting solar cells employing Sn S-doped spiro-OMe TAD HTLs delivered an improved stabilized power output efficiency of 21.75% as well as enhanced long-term stability and operational stability. Our results provide a simple method to modify the conventional spiro-OMe TAD and obtain PSCs with both high efficiency and good stability. 展开更多
关键词 Perovskite solar cells SnS nanoparticles Trap state passivation Stability
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Improved interfacial property by small molecule ethanediamine for high performance inverted planar perovskite solar cells
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作者 Guodong Zhang Yunxin Zhang +9 位作者 Siqi Chen Hao Chen Le Liu Wenming Ding Jinhui Wang Anyu Zhang Shuping Pang Xin Guo Lianqing Yu Tonggang Jiu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第3期467-474,共8页
We report a simple and effective method to realize desirable interfacial property for inverted planar perovskite solar cells(PSCs)by using small molecule ethanediamine for the construction of a novel polyelectrolyte h... We report a simple and effective method to realize desirable interfacial property for inverted planar perovskite solar cells(PSCs)by using small molecule ethanediamine for the construction of a novel polyelectrolyte hole transport material(P3CT-ED HTM).It is found that P3CT-ED can not only improve the hole transport property of P3CT-K but also improve the crystallinity of adjacent perovskite film.In addition,the introduction of ethanediamine into P3CT realigns the conduction and valence bands upwards,passivates surface defects and reduces nonradiative recombination.As a consequence,compared to P3CT-K hole transport layer(HTL)based devices,the average power conversion efficiency(PCE)is boosted from17.2% to 19.6% for the counterparts with P3CT-ED,with simultaneous enhancement in open circuit voltage and fill factor.The resultant device displays a champion PCE of 20.5% with negligible hysteresis. 展开更多
关键词 Improved interfacial property Inverted planar perovskite solar cells Passivated trap states Crystallinity Ethanediamine
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Performance of passive decoy-state quantum key distribution with mismatched local detectors
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作者 Kai Yu Chun-Hui Zhang +1 位作者 Xing-Yu Zhou Qin Wang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2022年第1期40-45,共6页
In quantum key distribution(QKD),the passive decoy-state method can simplify the intensity modulation and reduce some of side-channel information leakage and modulation errors.It is usually implemented with a heralded... In quantum key distribution(QKD),the passive decoy-state method can simplify the intensity modulation and reduce some of side-channel information leakage and modulation errors.It is usually implemented with a heralded single-photon source.In Wang et al 2016(Phys.Rev.A 96032312),a novel passive decoy-state method is proposed by Wang et al,which uses two local detectors to generate more detection events for tightly estimating channel parameters.However,in the original scheme,the two local detectors are assumed to be identical,including the same detection efficiency and dark count rate,which is often not satisfied in the realistic experiment.In this paper,we construct a model for this passive decoy-state QKD scheme with two mismatched detectors and explore the effect on QKD performance with certain parameters.We also take the finite-size effect into consideration,showing the performance with statistical fluctuations.The results show that the efficiencies of local detectors affect the key rate more obviously than dark count rates. 展开更多
关键词 quantum key distribution passive decoy state heralded single-photon source detector mismatch
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New protocols for non-orthogonal quantum key distribution
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作者 周媛媛 周学军 +1 位作者 田培根 王瑛剑 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第1期88-93,共6页
Combining the passive decoy-state idea with the active decoy-state idea, a non-orthogonal (SARG04) decoy-state protocol with one vacuum and two weak decoy states is introduced based on a heralded pair coherent state... Combining the passive decoy-state idea with the active decoy-state idea, a non-orthogonal (SARG04) decoy-state protocol with one vacuum and two weak decoy states is introduced based on a heralded pair coherent state photon source for quantum key distribution. Two special cases of this protocol are deduced, i.e., a one-vacuum-and-one-weak-decoy-state protocol and a one-weak-decoy-state protocol. In these protocols, the sender prepares decoy states actively, which avoids the crude estimation of parameters in the SARG04 passive decoy-state method. With the passive decoy-state idea, the detection events on Bob's side that are non-triggered on Alice's side are not discarded, but used to estimate the fractions of single-photon and two-photon pulses, which offsets the limitation of the detector's low efficiency and overcomes the shortcoming that the performance of the active decoy-state protocol critically depends on the efficiency of detector. The simulation results show that the combination of the active and passive decoy-state ideas increases the key generation rate. With a one-vacuum-and-two-weak-decoy-state protocol, one can achieve a key generation rate that is close to the theoretical limit of an infinite decoy-state protocol. The performance of the other two protocols is a little less than with the former, but the implementation is easier. Under the same condition of implementation, higher key rates can be obtained with our protocols than with existing methods. 展开更多
关键词 quantum key distribution non-orthogonal encoding protocol active decoy state passive decoy state
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Robust and Passive Motion Detection with COTS WiFi Devices 被引量:4
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作者 Hai Zhu Fu Xiao +3 位作者 Lijuan Sun Xiaohui Xie Panlong Yang Ruchuan Wang 《Tsinghua Science and Technology》 SCIE EI CAS CSCD 2017年第4期345-359,共15页
Device-free Passive(DfP) detection has received increasing attention for its ability to support various pervasive applications. Instead of relying on variable Received Signal Strength(RSS), most recent studies rel... Device-free Passive(DfP) detection has received increasing attention for its ability to support various pervasive applications. Instead of relying on variable Received Signal Strength(RSS), most recent studies rely on finer-grained Channel State Information(CSI). However, existing methods have some limitations, in that they are effective only in the Line-Of-Sight(LOS) or for more than one moving individual. In this paper, we analyze the human motion effect on CSI and propose a novel scheme for Robust Passive Motion Detection(R-PMD). Since traditional low-pass filtering has a number of limitations with respect to data denoising, we adopt a novel Principal Component Analysis(PCA)-based filtering technique to capture the representative signals of human motion and extract the variance profile as the sensitive metric for human detection. In addition, existing schemes simply aggregate CSI values over all the antennas in MIMO systems. Instead, we investigate the sensing quality of each antenna and aggregate the best combination of antennas to achieve more accurate and robust detection. The R-PMD prototype uses off-the-shelf WiFi devices and the experimental results demonstrate that R-PMD achieves an average detection rate of 96.33% with a false alarm rate of 3.67%. 展开更多
关键词 device-free passive detection Received Signal Strength(RSS) channel state information MIMO
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Hierarchy echo state network based service-awareness in 10G-EPON
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作者 Bai Huifeng Wang Dongshan +1 位作者 Wang Licheng Wang Xiang 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2016年第2期91-96,共6页
Aimed to enhance the supporting ability for diversified services, this paper proposes a hierarchy echo state network(HESE) based service-awareness(SA)(HESN-SA) mechanism in 10 Gbit/s Ethernet passive optical net... Aimed to enhance the supporting ability for diversified services, this paper proposes a hierarchy echo state network(HESE) based service-awareness(SA)(HESN-SA) mechanism in 10 Gbit/s Ethernet passive optical network(10G-EPON). In this HESN-SA, hierarchy architecture is adopted to realize echo state network(ESN) classification based SA. According to the network architecture of 10G-EPON, the parent-ESN(p-ESN) module works in the optical line terminal(OLT), while the sub-ESN(s-ESN) module is embedded in optical network units(ONUs). Thus, the p-ESN plays the main function of SA with a total view of this system, and s-ESN in each ONU conducts the SA function under the control of p-ESN. Thus, resources allocation and transport policy are both determined by the proposed mechanism through cooperation between OLT and ONUs. Simulation results show that the HESN-SA can improve the supporting ability for multiple services. 展开更多
关键词 passive optical network service-awareness hierarchy echo state network echo state network
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