Reference-frame-independent quantum key distribution(RFI-QKD) can avoid real-time calibration operation of reference frames and improve the efficiency of the communication process. However, due to imperfections of opt...Reference-frame-independent quantum key distribution(RFI-QKD) can avoid real-time calibration operation of reference frames and improve the efficiency of the communication process. However, due to imperfections of optical devices,there will inevitably exist intensity fluctuations in the source side of the QKD system, which will affect the final secure key rate. To reduce the influence of intensity fluctuations, an improved 3-intensity RFI-QKD scheme is proposed in this paper.After considering statistical fluctuations and implementing global parameter optimization, we conduct corresponding simulation analysis. The results show that our present work can present both higher key rate and a farther transmission distance than the standard method.展开更多
A modified continuous-variable quantum key distribution （CVQKD） protocol is proposed by originating the entangled source from a malicious third party Eve in the middle instead of generating it from the trustworthy A...A modified continuous-variable quantum key distribution （CVQKD） protocol is proposed by originating the entangled source from a malicious third party Eve in the middle instead of generating it from the trustworthy Alice or Bob. This method is able to enhance the efficiency of the CVQKD scheme attacked by local oscillator （LO） intensity attack in terms of the generated secret key rate in quantum communication. The other indication of the improvement is that the maximum transmission distance and the maximum loss tolerance can be increased significantly, especially for CVQKD schemes based on homodyne detection.展开更多
Titles、Abstracts and Key Words(1 th) Lu Guoyao A Brief Comment on "Documentary Linguistics"Abstract: Two thousand and five hundred years ago, Confucius attached great importance to "Document". We ...Titles、Abstracts and Key Words(1 th) Lu Guoyao A Brief Comment on "Documentary Linguistics"Abstract: Two thousand and five hundred years ago, Confucius attached great importance to "Document". We suggest that knowledge that regards both literature and oral material as the major resources should be respected. These knowledge interrelates and completes each other.展开更多
In principle,the asynchronous measurement-device-independent quantum key distribution(AMDI-QKD)can surpass the key rate capacity without phase tracking and phase locking.However,practical imperfections in sources or d...In principle,the asynchronous measurement-device-independent quantum key distribution(AMDI-QKD)can surpass the key rate capacity without phase tracking and phase locking.However,practical imperfections in sources or detections would dramatically depress its performance.Here,we present an improved model on AMDI-QKD to reduce the influence of these imperfections,including intensity fluctuation,the afterpulse effect,and the dead time of detectors.Furthermore,we carry out corresponding numerical simulations.Simulation results show that,by implementing our present work,it can have more than 100 km longer secure transmission distance and one order of magnitude enhancement in the key generation rate after 320 km compared with the standard method.Moreover,our model can still break the Pirandola–Laurenza–Ottaviani–Banchi(PLOB)bound even under realistic experimental conditions.展开更多
In this paper, we provide a Word Emotion Topic （WET） model to predict the complex word e- motion information from text, and discover the dis- trbution of emotions among different topics. A complex emotion is defined...In this paper, we provide a Word Emotion Topic （WET） model to predict the complex word e- motion information from text, and discover the dis- trbution of emotions among different topics. A complex emotion is defined as the combination of one or more singular emotions from following 8 basic emotion categories： joy, love, expectation, sur- prise, anxiety, sorrow, anger and hate. We use a hi- erarchical Bayesian network to model the emotions and topics in the text. Both the complex emotions and topics are drawn from raw texts, without con- sidering any complicated language features. Our ex- periment shows promising results of word emotion prediction, which outperforms the traditional parsing methods such as the Hidden Markov Model and the Conditional Random Fields（CRFs） on raw text. We also explore the topic distribution by examining the emotion topic variation in an emotion topic diagram.展开更多
The modern language teaching theory highly emphasizes the effect of"listening"on the learning and the use of language. The teaching of English listening is not only a teaching of language, but also a kind of...The modern language teaching theory highly emphasizes the effect of"listening"on the learning and the use of language. The teaching of English listening is not only a teaching of language, but also a kind of training of ability. In the four skills of listening, writing, reading and speaking, listening is considered as the basic, and the most important skill. It isn't only the main way of acquiring language information, but the base of improving other skills. Listening practice is especially important in classrooms where English is taught as a foreign language, that is, in situations where English is not the language of the country and where opportunities for hearing English outside the classroom are few. Students in such environments often learn to read and write English, and even to speak English, but they frequently have great difficulty comprehending English spoken to them.Plenty of Chinese students claim that the listening test is the most difficult part of English test. As a result, teachers should take particular pains to avoid such simplification and to provide opportunities for students to hear the kind of language that will prepare them for situations outside the classroom. Teachers should try to anticipate the kind of English the students will hear when the opportunity arises for them to be in an English-speaking country. In this article, I start with the factors which may exert an influence on listening comprehension, shows ways to improve listening comprehension and design some useful activities in the class. And I also focus on the activities of English listening teaching and insist that the activities should be both emphasized on the process of listening and the result of listening, due to different situations.展开更多
基金financial support from the Industrial Prospect and Key Core Technology Projects of Jiangsu Provincial Key R&D Program (Grant No. BE2022071)the Natural Science Foundation of Jiangsu Province (Grant No. BK20192001)+1 种基金the National Natural Science Foundation of China (Grant No. 12074194)the Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. KYCX220954)。
文摘Reference-frame-independent quantum key distribution(RFI-QKD) can avoid real-time calibration operation of reference frames and improve the efficiency of the communication process. However, due to imperfections of optical devices,there will inevitably exist intensity fluctuations in the source side of the QKD system, which will affect the final secure key rate. To reduce the influence of intensity fluctuations, an improved 3-intensity RFI-QKD scheme is proposed in this paper.After considering statistical fluctuations and implementing global parameter optimization, we conduct corresponding simulation analysis. The results show that our present work can present both higher key rate and a farther transmission distance than the standard method.
基金supported by the National Natural Science Foundation of China(Grant Nos.61379153,61401519,and 61572529)the Natural Science Foundation of Hunan Province,China(Grant No.2017JJ3415)+1 种基金the Science and Technology Project of Guangxi Zhuang Autonomous Region,China(Grant Nos.AC16380094and 1598008-29)the Natural Science Fund of Guangxi Zhuang Autonomous Region,China(Grant No.2015GXNSFAA139298)
文摘A modified continuous-variable quantum key distribution （CVQKD） protocol is proposed by originating the entangled source from a malicious third party Eve in the middle instead of generating it from the trustworthy Alice or Bob. This method is able to enhance the efficiency of the CVQKD scheme attacked by local oscillator （LO） intensity attack in terms of the generated secret key rate in quantum communication. The other indication of the improvement is that the maximum transmission distance and the maximum loss tolerance can be increased significantly, especially for CVQKD schemes based on homodyne detection.
文摘Titles、Abstracts and Key Words(1 th) Lu Guoyao A Brief Comment on "Documentary Linguistics"Abstract: Two thousand and five hundred years ago, Confucius attached great importance to "Document". We suggest that knowledge that regards both literature and oral material as the major resources should be respected. These knowledge interrelates and completes each other.
基金Project supported by Natural Science Foundation of Jiangsu Province(Grant Nos.BE2022071 and BK20192001)the National Natural Science Foundation of China(Grant Nos.12074194,62101285,62471248,and 12104240)Postgraduate Research&Practice Innovation Program of Jiangsu Province(Grant No.KYCX220954).
文摘In principle,the asynchronous measurement-device-independent quantum key distribution(AMDI-QKD)can surpass the key rate capacity without phase tracking and phase locking.However,practical imperfections in sources or detections would dramatically depress its performance.Here,we present an improved model on AMDI-QKD to reduce the influence of these imperfections,including intensity fluctuation,the afterpulse effect,and the dead time of detectors.Furthermore,we carry out corresponding numerical simulations.Simulation results show that,by implementing our present work,it can have more than 100 km longer secure transmission distance and one order of magnitude enhancement in the key generation rate after 320 km compared with the standard method.Moreover,our model can still break the Pirandola–Laurenza–Ottaviani–Banchi(PLOB)bound even under realistic experimental conditions.
基金supported by the Ministry of Education,Science,Sports and Culture,Grant-in-Aid for Scientific Research under Grant No.22240021the Grant-in-Aid for Challenging Exploratory Research under Grant No.21650030
文摘In this paper, we provide a Word Emotion Topic （WET） model to predict the complex word e- motion information from text, and discover the dis- trbution of emotions among different topics. A complex emotion is defined as the combination of one or more singular emotions from following 8 basic emotion categories： joy, love, expectation, sur- prise, anxiety, sorrow, anger and hate. We use a hi- erarchical Bayesian network to model the emotions and topics in the text. Both the complex emotions and topics are drawn from raw texts, without con- sidering any complicated language features. Our ex- periment shows promising results of word emotion prediction, which outperforms the traditional parsing methods such as the Hidden Markov Model and the Conditional Random Fields（CRFs） on raw text. We also explore the topic distribution by examining the emotion topic variation in an emotion topic diagram.
文摘The modern language teaching theory highly emphasizes the effect of"listening"on the learning and the use of language. The teaching of English listening is not only a teaching of language, but also a kind of training of ability. In the four skills of listening, writing, reading and speaking, listening is considered as the basic, and the most important skill. It isn't only the main way of acquiring language information, but the base of improving other skills. Listening practice is especially important in classrooms where English is taught as a foreign language, that is, in situations where English is not the language of the country and where opportunities for hearing English outside the classroom are few. Students in such environments often learn to read and write English, and even to speak English, but they frequently have great difficulty comprehending English spoken to them.Plenty of Chinese students claim that the listening test is the most difficult part of English test. As a result, teachers should take particular pains to avoid such simplification and to provide opportunities for students to hear the kind of language that will prepare them for situations outside the classroom. Teachers should try to anticipate the kind of English the students will hear when the opportunity arises for them to be in an English-speaking country. In this article, I start with the factors which may exert an influence on listening comprehension, shows ways to improve listening comprehension and design some useful activities in the class. And I also focus on the activities of English listening teaching and insist that the activities should be both emphasized on the process of listening and the result of listening, due to different situations.
