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| 1 | Implementation and security analysis of practical quantum secure direct communication显示文摘Rapid development of supercomputers and the prospect of quantum computers are posing increasingly serious threats to the security of communication.Using the principles of quantum mechanics,quantum communication offers provable security of communication and is a promising solution to counter such threats.Quantum secure direct communication(QSDC)is one important branch of quantum communication.In contrast to other branches of quantum communication,it transmits secret information directly.Recently,remarkable progress has been made in proof-of-principle experimental demonstrations of QSDC.However,it remains a technical feat to bring QSDC into a practical application.Here,we report the implementation of a practical quantum secure communication system.The security is analyzed in the Wyner wiretap channel theory.The system uses a coding scheme of concatenation of lowdensity parity-check(LDPC)codes and works in a regime with a realistic environment of high noise and high loss.The present system operates with a repetition rate of 1 MHz at a distance of 1.5 kilometers.The secure communication rate is 50 bps,sufficient to effectively send text messages and reasonably sized files of images and sounds. | Ruoyang Qi Zhen Sun Zaisheng Lin Penghao Niu Wentao Hao Liyuan Song Qin Huang Jiancun Gao Liuguo Yin Gui-Lu Long | 2019 | Light(Science & Applications)2019，8，1： | 15 |
| 2 | Measurement-device-independent quantum secure direct communication显示文摘Quantum secure direct communication(QSDC)is a unique technique,which supports the secure transmission of confidential information directly through a quantum channel without the need for a secret key and for ciphertext.Hence this secure communication protocol fundamentally differs from its conventional counterparts.In this article,we report the first measurement-deviceindependent(MDI)QSDC protocol relying on sequences of entangled photon pairs and single photons.Explicitly,it eliminates the security loopholes associated with the measurement device.Additionally,this MDI technique is capable of doubling the communication distance of its conventional counterpart operating without using our MDI technique.We also conceive a protocol associated with linear optical Bell-basis measurements,where only two of the four Bell-basis states could be measured.When the number of qubits in a sequence reduces to 1,the MDI-QSDC protocol degenerates to a deterministic MDI quantum key distribution protocol. | ZengRong Zhou Yu Bo Sheng PengHao Niu LiuGuo Yin GuiLu Long Lajos Hanzo | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，3： | 6 |
| 3 | Generalized Low-Density Parity-Check Coding Scheme with Partial-Band Jamming显示文摘In this study,a class of Generalized Low-Density Parity-Check(GLDPC) codes is designed for data transmission over a Partial-Band Jamming(PBJ) environment. The GLDPC codes are constructed by replacing parity-check code constraints with those of nonsystematic Bose-Chaudhuri-Hocquenghem(BCH),referred to as Low-Density Parity-Check(LDPC)-BCH codes. The rate of an LDPC-BCH code is adjusted by selecting the transmission length of the nonsystematic BCH code,and a low-complexity decoding algorithm based on messagepassing is presented that employs A Posteriori Probability(APP) fast BCH transform for decoding the BCH check nodes at each decoding iteration. Simulation results show that the LDPC-BCH codes with a code rate of 1/8.5have a bit error rate performance of 1 10 6at signal-noise-ratios of 6.97 dB,4.63 dB,and 2.48 dB when the fractions of the band jammed are 30%,50%,and 70%,respectively. | Qi Li Xinru Qu Liuguo Yin Jianhua Lu | 2014 | Tsinghua Science and Technology2014，19，2： | 5 |
| 4 | Experimental free-space quantum secure direct communication and its security analysis显示文摘We report an experimental implementation of free-space quantum secure direct communication based on single photons.The quantum communication scheme uses phase encoding,and the asymmetric Mach–Zehnder interferometer is optimized so as to automatically compensate phase drift of the photons during their transitions over the free-space medium.At a 16 MHz pulse repetition frequency,an information transmission rate of 500 bps over a 10 m free space with a mean quantum bit error rate of 0.49%±0.27%is achieved.The security is analyzed under the scenario that Eve performs the collective attack for single-photon state and the photon number splitting attack for multi-photon state in the depolarizing channel.Our results show that quantum secure direct communication is feasible in free space. | DONG PAN ZAISHENG LIN JIAWEI WU HAORAN ZHANG ZHEN SUN DONG RUAN LIUGUO YIN AND GUI LU LONG | 2020 | Photonics Research2020，8，9： | 5 |
| 5 | Efficient Helicopter-Satellite Communication Scheme Based on Check-Hybrid LDPC Coding显示文摘When implementing helicopter-satellite communications, periodical interruption of the received signal is a challenging problem because the communication antenna is intermittently blocked by the rotating blades of the helicopter. The helicopter-satellite channel model and the Forward Error Control(FEC) coding countermeasure are presented in this paper. On the basis of this model, Check-Hybrid(CH) Low-Density Parity-Check(LDPC)codes are designed to mitigate the periodical blockage over the helicopter-satellite channels. The CH-LDPC code is derived by replacing part of single parity-check code constraints in a Quasi-Cyclic LDPC(QC-LDPC) code by using more powerful linear block code constraints. In particular, a method of optimizing the CH-LDPC code ensemble by searching the best matching component code among a variety of linear block codes using extrinsic information transfer charts is proposed. Simulation results show that, the CH-LDPC coding scheme designed for the helicopter-satellite channels in this paper achieves more than 25% bandwidth efficiency improvement, compared with the FEC scheme that uses QC-LDPC codes. | Ping Wang Liuguo Yin Jianhua Lu | 2018 | Tsinghua Science and Technology2018，23，3： | 5 |
| 6 | CodeHop: physical layer error correction and encryption with LDPC-based code hopping显示文摘This paper proposes a novel scheme named Code Hop, which provides both information reliability and security using code hopping based on low-density parity-check(LDPC) codes. In contrast to traditional systems that perform error correction and encryption at different layers, Code Hop combines these two operations into a single step at physical layer, such that each plaintext message is jointly encoded and encrypted by a hopping parity-check matrix. According to a pseudo-random number generator(PRNG), the hopping matrix may rapidly switch among a sequence of LDPC parity-check matrices, which is randomly generated by a structured-random protograph expanding technique. Simulations show that reliable communication can be achieved by Code Hop with good error-correcting performance. In the meantime, Code Hop may improve the security of traditional systems such as GSM. Taking the A5/1 stream cipher used in GSM as the PRNG, it is shown that Code Hop is resistant to existing chosen-plaintext attacks that break A5/1 cipher already. Moreover, the security of Code Hop will be enhanced in the presence of channel errors as well. | Zhao CHEN Liuguo YIN Yukui PEI Jianhua LU | 2016 | Science China(Information Sciences)2016，59，10： | 3 |
| 7 | Realization of quantum secure direct communication over 100 km fiber with time-bin and phase quantum states显示文摘Rapid progress has been made in quantum secure direct communication in recent years.For practical application,it is important to improve the performances,such as the secure information rate and the communication distance.In this paper,we report an elaborate physical system design and protocol with much enhanced performance.This design increased the secrecy capacity greatly by achieving an ultra-low quantum bit error rate of<0.1%,one order of magnitude smaller than that of existing systems.Compared to previous systems,the proposed scheme uses photonic time-bin and phase states,operating at 50 MHz of repetition rate,which can be easily upgraded to over 1 GHz using current on-the-shelf technology.The results of our experimentation demonstrate that the proposed system can tolerate more channel loss,from 5.1 dB,which is about 28.3 km in fiber in the previous scheme,to 18.4 dB,which corresponds to fiber length of 102.2 km.Thus,the experiment shows that intercity quantum secure direct communication through fiber is feasible with present-day technology. | Haoran Zhang Zhen Sun Ruoyang Qi Liuguo Yin Gui-Lu Long Jianhua Lu | 2022 | Light(Science & Applications)2022，11，5： | 2 |
| 8 | Quantum-safe cryptography:crossroads of coding theory and cryptography显示文摘We present an overview of quantum-safe cryptography(QSC)with a focus on post-quantum cryptography(PQC)and information-theoretic security.From a cryptographic point of view,lattice and code-based schemes are among the most promising PQC solutions.Both approaches are based on the hardness of decoding problems of linear codes with different metrics.From an information-theoretic point of view,lattices and linear codes can be constructed to achieve certain secrecy quantities for wiretap channels as is intrinsically classical-and quantum-safe.Historically,coding theory and cryptography are intimately connected since Shannon’s pioneering studies but have somehow diverged later.QSC offers an opportunity to rebuild the synergy of the two areas,hopefully leading to further development beyond the NIST PQC standardization process.In this paper,we provide a survey of lattice and code designs that are believed to be quantum-safe in the area of cryptography or coding theory.The interplay and similarities between the two areas are discussed.We also conclude our understandings and prospects of future research after NIST PQC standardisation. | Jiabo WANG Ling LIU Shanxiang LYU Zheng WANG Mengfan ZHENG Fuchun LIN Zhao CHEN Liuguo YIN Xiaofu WU Cong LING | 2022 | Science China(Information Sciences)2022，65，1： | 1 |
| 9 | Corrosion influence on bond in reinforced concrete显示文摘 | Fang Congqi Karin Ltmdgren Chen Liuguo | 2004 | Cement and Concrete Research2004，34，： | 1 |
| 10 | Burst-error-correcting algorithm for Reed-Solomon codes显示文摘 | Yin Liuguo Lu Jianhua Letaief K Ben Wu Youshou | 2001 | Electronics letters2001，37，11： | 1 |
| 11 | Corrosion Influence on Bond Inreinforced Concrete显示文摘 | Fang Congqi Karin Lundgren Chen Liuguo | 2004 | Cement and Concrete Research2004，34，： | 1 |
| 12 | Corrosion influence on bond in reinforced eonerete显示文摘 | Congqi F Karin L Liuguo C | 2004 | Cement and Con- crete Research2004，34，11： | 1 |
| 13 | Corrosion influence on bond in reinforced concrete显示文摘 | CONGQI F K LUNDGREN C LIUGUO | 2004 | Cement and Concrete Research2004，34，： | 1 |
| 14 | Corrosion influence on bond in reinforced concrete显示文摘 | Congqi Fang Karin Lundgren Liuguo Chen Chaoying Zhu | 2004 | Cement and Concrete Research2004，，11： | 1 |
| 15 | Corrosion in- fluence on bond in reinforced concrete显示文摘 | FANG Congqi LUNDGREN K CHEN Liuguo | 2004 | Cement and Concrete Re- search2004，34，2： | 1 |
| 16 | Quantum secure direct communication with entanglement source and single-photon measurement显示文摘Quantum secure direct communication(QSDC)transmits information directly over a quantum channel.In addition to security in transmission,it avoids loopholes of key loss and prevents the eavesdropper from getting ciphertext.In this article,we propose a QSDC protocol using entangled photon pairs.This protocol differs from existing entanglement-based QSDC protocols because it does not perform Bell-state measurement,and one photon of the entangled pair is measured after the entanglement distribution.It has the advantage of high signal-to-noise ratio due to the heralding function of entanglement pairs,and it also has the relative ease in performing single-photon measurement.The protocol can use a practical entanglement source from spontaneous parametric down-conversion(SPDC);Gottesman-Lo-Lu¨tkenhaus-Preskill theory and the decoy state method give a better estimate of the error rate.Security analysis is completed with Wyner’s wiretap channel theory,and the lower bound of the secrecy capacity is estimated.Numerical simulations were carried out to study the performance of the protocol.These simulations demonstrated that the protocol with a practical SPDC entanglement source performed well and was close to the case with an ideal entanglement source. | Lu Yang JiaWei Wu ZaiSheng Lin LiuGuo Yin GuiLu Long | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，11： | 1 |
| 17 | Burst-error-correcting Algorithm for Reed-Solomon Codes显示文摘 | Yin Liuguo Lu Jianhua Letaief K Ben Wu Youshou | 2001 | Electronics Letters2001，37，11： | 1 |
| 18 | Corrosion influence on bond in reinforced concrete 显示文摘 | Congqi F Karin L Liuguo C | 2004 | Cement and Concrete Research2004，34，11： | 1 |
| 19 | Corrosion influence on bond in reinforced concrete显示文摘 | Fang Congqi Karin Lundgren Chen Liuguo etc | 2004 | Cement and Concrete Research2004，34，： | 1 |
| 20 | Corrosion influence on bond in reinforced concrete显示文摘 | Congqi Fang Karin Lundgren Liuguo Chen | | 0，，11： | 1 |
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