Article
Computer Science, Theory & Methods
Wenwen Hu, Ri-Gui Zhou, She-Xiang Jiang
Summary: This paper proposes a semi-quantum key distribution protocol using (d+1) quantum states, without requiring the classical party's measurement capability. It improves the key rate and noise tolerance against attacks.
INTERNATIONAL JOURNAL OF QUANTUM INFORMATION
(2023)
Article
Optics
Yang-Guang Shan, Zhen-Qiang Yin, Hang Liu, Shuang Wang, Wei Chen, De-Yong He, Guang-Can Guo, Zheng-Fu Han
Summary: In this article, a round-robin-differential-quadrature-phase-shift (RRDQPS) protocol is proposed by introducing four-phase modulations into the round-robin-differential-phase-shift (RRDPS) quantum key distribution (QKD) protocol. The security proof for the general n-photon RRDQPS protocol is provided, making RRDQPS protocol with a practical weak coherent source feasible in experiments. Numerical simulation confirms the advantage of RRDQPS protocol over RRDPS protocol in terms of transmission distance, especially with a small number of pulses.
Article
Optics
Rui-Qi Gao, Yuan-Mei Xie, Jie Gu, Wen-Bo Liu, Chen-Xun Weng, Bing-Hong Li, Hua-Lei Yin, Zeng-Bing Chen
Summary: This study proposes an improved implementation scheme for COW-QKD by adding a decoy sequence, enabling secure distribution of secret keys over a longer distance. The scheme maintains the original experimental setup and simplicity, while providing high-performance security against attacks.
Article
Quantum Science & Technology
Subhankar Bera, Shashank Gupta, A. S. Majumdar
Summary: We uniformly generate random states of various ranks and study their performance in entanglement-based quantum key distribution. We analyze the efficacy of random two-qubit states in device-independent QKD and observe that the number of entangled and Bell-nonlocal states decreases as rank increases. The decrease in the secure key rate is more pronounced with the increase in rank. We find that pure state and Werner state provide the upper and lower bound on the minimum secure key rate of all mixed two-qubit states with the same magnitude of entanglement under general and optimal collective attack strategies.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Telecommunications
Ye Chongqiang, Li Jian, Chen Xiubo, Tian Yuan, Hou Yanyan
Summary: This study proposes an efficient semi-quantum key distribution protocol to address the high costs of quantum resources, and demonstrates its information-theoretic security. It also highlights the advantages of the protocol in terms of qubit efficiency and communication cost, and considers the effects of noise factors in the efficiency analysis.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Quantum Science & Technology
Naveed Mahmud, Andrew MacGillivray, Apurva Rai, Jenna Patterson, Adam Gharaibeh, Esam El-Araby, Harry Shaw, Lavida Cooper
Summary: This research proposes a free-space optical communication system that combines chaotic communications and quantum key distribution for greater security and range. Using Lorenz chaotic models, data transmission is secure and synchronization parameters are exchanged via quantum channels. Experimental results demonstrate successful real-time transmission, measurement of bit-error-rate, and evaluation of security and robustness.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Quantum Science & Technology
Guillermo Curras-Lorenzo, Alvaro Navarrete, Koji Azuma, Go Kato, Marcos Curty, Mohsen Razavi
Summary: QKD provides a reliable solution to long-term data security communication issues, with TF-QKD being a step towards improving rate and coverage. It offers higher key rates, able to overcome fundamental limits and is suitable for experimental implementation, outperforming other variants.
NPJ QUANTUM INFORMATION
(2021)
Article
Optics
Xiao-Juan Huang, Feng-Yu Lu, Shuang Wang, Zhen-Qiang Yin, Ze-Hao Wang, Wei Chen, De-Yong He, Guan-Jie Fan-Yuan, Guang-Can Guo, Zheng-Fu Han
Summary: This article presents a dependency model for quantum-key distribution (QKD) systems, which improves the optimization accuracy and guides users on choosing suitable dead time parameters by considering the dead time and afterpulse issues of single-photon avalanche diodes (SPADs).
Article
Quantum Science & Technology
Hao Tan, Wei-Yang Zhang, Likang Zhang, Wei Li, Sheng-Kai Liao, Feihu Xu
Summary: Quantum key distribution (QKD) enables secure sharing of secret keys between remote parties. However, the imperfections in realistic devices can pose security risks. This study focuses on the influence of external magnetic fields on the security of practical QKD systems, particularly on the optical isolators and circulators commonly used in standard QKD setups that are susceptible to external magnetic perturbations. The research provides a comprehensive analysis of the security risks and potential countermeasures.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Quantum Science & Technology
Julia Guskind, Walter O. Krawec
Summary: This paper introduces a new mediated semi-quantum key distribution protocol with asymptotically perfect efficiency, though at the cost of decreased noise tolerance. To prove security, the paper shows an interesting reduction from the mediated semi-quantum scenario to a fully-quantum entanglement based protocol.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Bing Liu, Xinrui Liu, Weiguang Jia
Summary: This study analyzes the impact of two-way entanglement purification (2-EPP) on the performance of practical quantum key distribution (QKD) by examining the process of purifying single photons and untagged bits. The results show that 2-EPP can extend the communication distance even when the sources are not ideal.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Computer Science, Information Systems
Maryam Shabbir, Fahad Ahmad, Ayesha Shabbir, Saad Awadh Alanazi
Summary: This paper aims to develop a computer system with self-learning, management, inherent security, rigorous, and reliable authentication capabilities through the collaboration of cognitive computing, quantum computing, and cyber security, in order to ensure the security of nuclear command and control centers.
JOURNAL OF KING SAUD UNIVERSITY-COMPUTER AND INFORMATION SCIENCES
(2022)
Article
Quantum Science & Technology
Hasnaa Hajji, Morad El Baz
Summary: This article explores the unconditional security of a semi quantum key distribution (SQKD) protocol based on 3-dimensional quantum states. The results show that this protocol has improved secret key rate and higher tolerance for noise compared to the previous 2-dimensional protocol, highlighting the potential benefits of increasing system dimension in semi-quantum key distribution.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Physics, Multidisciplinary
Shihai Sun, Anqi Huang
Summary: In this paper, the development of quantum hacking and security evaluation technology for practical quantum key distribution system is briefly reviewed. The security requirements and parameters in each module are discussed, and the relationship between quantum hacking and security parameters are also shown.
Article
Multidisciplinary Sciences
Nitin Jain, Hou-Man Chin, Hossein Mani, Cosmo Lupo, Dino Solar Nikolic, Arne Kordts, Stefano Pirandola, Thomas Brochmann Pedersen, Matthias Kolb, Bernhard Omer, Christoph Pacher, Tobias Gehring, Ulrik L. Andersen
Summary: This paper introduces a continuous-variable quantum key distribution (CVQKD) protocol that can generate composable keys secure against collective attacks. By using Gaussian-modulated coherent states and improving the security proof and system operation, this CVQKD protocol overcomes the difficulty of key generation in existing protocols. This advance brings CVQKD implementations closer to their discrete-variable counterparts in terms of practicality, performance, and security.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Stella Seah, Stefan Nimmrichter, Valerio Scarani
PHYSICAL REVIEW LETTERS
(2020)
Article
Quantum Science & Technology
Le Phuc Thinh, Michele Dall'Arno, Valerio Scarani
Article
Multidisciplinary Sciences
Rene Schwonnek, Koon Tong Goh, Ignatius W. Primaatmaja, Ernest Y-Z Tan, Ramona Wolf, Valerio Scarani, Charles C-W Lim
Summary: Device-independent quantum key distribution aims at achieving ultimate quantum-based unconditional security, but current protocols' rates are quite far from anything practical. The authors' protocol narrows this gap by using two randomly chosen key generating bases instead of one.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Wei Zhang, Tim van Leent, Kai Redeker, Robert Garthoff, Rene Schwonnek, Florian Fertig, Sebastian Eppelt, Wenjamin Rosenfeld, Valerio Scarani, Charles C-W Lim, Harald Weinfurter
Summary: Device-independent quantum key distribution (DIQKD) is a method that generates secret keys over an untrusted channel using uncharacterized and potentially untrusted devices. This study presents an experimental system that enables DIQKD between two distant users by generating and analyzing event-ready entanglement between two independently trapped single rubidium atoms located 400 meters apart. The results show the system's capability to generate secret keys and pave the way for quantum secure communications in future quantum networks.
Article
Physics, Multidisciplinary
Lin Htoo Zaw, Zakarya Lasmar, Chi-Huan Nguyen, Ko-Wei Tseng, Dzmitry Matsukevichl, Dagomir Kaszlikowski, Valerio Scarani
Summary: This research proposes a probabilistic scheme based on the boson sculpting technique to generate multipartite highly entangled states in trapped ion systems. The effects of decoherence on the fidelity of the generated state are also investigated.
NEW JOURNAL OF PHYSICS
(2022)
Article
Optics
Peter Sidajaya, Wan Cong, Valerio Scarani
Summary: This study proposes a method to address the two fundamental problems of quantum gravity, which are how to prepare a gravity source in a quantum state and how to fight localization by decoherence. The authors suggest using the Zeno effect to freeze the source in the desired state and verifying the successful implementation through scattering a probe.
Article
Optics
Lin Htoo Zaw, Clive Cenxin Aw, Zakarya Lasmar, Valerio Scarani
Summary: Building upon Tsirelson's work, this study presents a series of protocols for detecting the nonclassicality of suitable states in a single quantum system, assuming the measured dynamical observable undergoes a uniform precession. The researchers extend the previous work by Tsirelson to include the case of the harmonic oscillator. Additionally, they apply the protocols to finite-dimensional spins undergoing uniform precession in real space, observing a gap between the classical and quantum expectations for all j 32 (excluding j = 2).
Article
Optics
Baichu Yu, Pooja Jayachandran, Adam Burchardt, Yu Cai, Nicolas Brunner, Valerio Scarani
Summary: This study investigates the properties of absolutely entangled sets (AESs) of pure quantum states, presenting a sufficient condition to detect an AES for two-qubit systems and proving that sets of a certain number of states are AESs with Haar measure 1 for a general bipartition. The research also defines AESs for multipartitions, deriving a lower bound on the number of states in an AES for a given multipartition and providing explicit examples.
Article
Optics
Yu Cai, Baichu Yu, Pooja Jayachandran, Nicolas Brunner, Valerio Scarani, Jean-Daniel Bancal
Summary: This work introduces the concept of absolutely entangled sets of quantum states, where at least one state in the set is entangled for any global basis. A quantitative measure for absolute set entanglement is proposed, with a method based on polynomial optimization to perform convex optimization over unitaries for lower bounding this quantity.
Article
Physics, Fluids & Plasmas
Francesco Buscemi, Valerio Scarani
Summary: The reverse process in the studies of irreversibility in statistical mechanics arises naturally from Bayesian retrodiction, providing a broader scope for fluctuation relations. Previous paradigmatic results, such as Jarzynski's equality, Crooks' fluctuation theorem, and Tasaki's two-measurement fluctuation theorem, are consistent with retrodictive arguments. Various corrections introduced to deal with nonequilibrium steady states or open quantum systems are justified as remnants of Bayesian retrodiction.
Article
Optics
Ignatius William Primaatmaja, Asaph Ho, Valerio Scarani
Summary: The study introduces a toolbox for optimal discrimination of any set of optical modes, using linear and semidefinite programming techniques. The research explores channel-discrimination and source-discrimination scenarios, finding that optimal state for mode discrimination may be a superposition or mixture of at most two number states.
Article
Physics, Multidisciplinary
Clive Aw, Michele Dall'Arno, Valerio Scarani
QUANTUM STUDIES-MATHEMATICS AND FOUNDATIONS
(2020)
Article
Optics
Angeline Shu, Stella Seah, Valerio Scarani
Article
Quantum Science & Technology
Michele Dall'Arno, Francesco Buscemi, Valerio Scarani
Article
Optics
Angeline Shu, Yu Cai, Stella Seah, Stefan Nimmrichter, Valerio Scarani
