Article
Physics, Multidisciplinary
M. N. Notarnicola, M. Jarzyna, S. Olivares, K. Banaszek
Summary: We propose a continuous-variable quantum key distribution protocol utilizing quaternary phase-shift-keying and a non-Gaussian measurement. By optimizing the receiver design, our approach achieves a higher secure key rate for metropolitan-network distances compared to existing methods. Furthermore, we investigate the implementation of feasible schemes, such as the displacement feed-forward receiver, which leads to an increase in the secure key rate in specific regimes.
NEW JOURNAL OF PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Daryus Chandra, Marcello Caleffi, Angela Sara Cacciapuoti
Summary: This article investigates the application of the indefinite causal order of quantum channels in entanglement-assisted classical and quantum communications. By exploiting the indefinite causal order of quantum channels, capacity gains can be achieved and the bottleneck capacity can be violated in certain scenarios.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2022)
Article
Quantum Science & Technology
Johannes Pseiner, Lukas Achatz, Lukas Bulla, Martin Bohmann, Rupert Ursin
Summary: The study introduces a strategy utilizing wavelength multiplexing to generate quantum secure keys with the potential to significantly increase the key generation rate. This approach can be applied to various implementations and offers substantial scalability.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Sheng Ming, Jinxian Guo, Yuan Wu, Guzhi Bao, Shuhe Wu, Minwei Shi, Liqing Chen, Weiping Zhang
Summary: Optical quantum memory is a crucial component in the field of quantum technologies. In this study, the researchers demonstrated the optimization of Raman quantum memory using a new method called phase modulation. By applying this method, they achieved a total memory efficiency of 52.7%, which is a 13.3% improvement compared to the best case without phase modulation. The researchers also demonstrated a hybrid method combining phase and intensity modulations, which achieved a memory efficiency of 87.3%.
SCIENCE CHINA-INFORMATION SCIENCES
(2023)
Article
Engineering, Electrical & Electronic
Weiwen Kong, Yongmei Sun, Yaoxian Gao, Yuefeng Ji
Summary: This paper proposes core and wavelength allocation schemes for the simultaneous transmission of classical signals and QKD over MCF. By reducing noise interference and adopting appropriate wavelength allocation, the secure key rate and transmission distance of QKD can be improved.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Physics, Applied
Adria Sansa Perna, Evelyn Ortega, Markus Graefe, Fabian Steinlechner
Summary: In this study, a polarization-entangled photon pair source operating in the visible light range is presented, with high brightness and quantum state fidelity. By studying the trade-off between source brightness and entanglement visibility, application cases for different filtering configurations are proposed, achieving higher brightness.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Yuqing Huang, Zhongqi Sun, Tianqi Dou, Jipeng Wang, Zhenhua Li, Fen Zhou, Yanxin Han, Haiqiang Ma
Summary: This paper investigates the performance of TF-QKD protocol in free space, proposing a free-space channel model and discussing the impact of turbulence characteristics. Simulation results demonstrate that the performance of free-space TF-QKD is influenced by link configuration and turbulence motion.
MODERN PHYSICS LETTERS B
(2022)
Article
Quantum Science & Technology
Si-ren Yang, Chang-shui Yu
Summary: In this paper, we investigate how to quantify dynamical quantum resources in the resource non-increasing framework, presenting two methods: distance measures and maximal increasing static resource. Using the quantification of dynamical total coherence as a demonstration, the distance-based measures are shown to have good operational interpretation and can be numerically calculated through semidefinite programming, while measures based on the maximal increasing static resource lead to analytical solutions.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Computer Science, Artificial Intelligence
Fuad E. Alsaadi, Zidong Wang, Khalid H. Alharbi
Summary: In networked systems, remote state estimation is achieved through the use of communication schedulers to improve resource efficiency and share information among different subchannels. The recursive approximate minimum mean-square error estimator can restore the state vector of the target system. The effectiveness of the main results is demonstrated through a numerical example.
INFORMATION FUSION
(2022)
Article
Physics, Multidisciplinary
Arindam Mitra, Himanshu Badhani, Sibasish Ghosh
Summary: Applications of the quantum switch on quantum channels have been a hot topic. In this work, we find that some useless channels can provide useful communication under the action of a quantum switch for tasks like quantum random access codes and quantum steering. We also demonstrate the usefulness of the quantum switch in preventing coherence loss when only coherence-breaking channels are available. Furthermore, we show that by concatenating a useless channel with another suitable quantum channel and subsequently using the switch, useful communication can be achieved.
Article
Quantum Science & Technology
Beili Gong, Fang Gao, Wei Cui
Summary: We propose a W state-based protocol for anonymously transmitting quantum messages in a quantum network using only quantum channels and regular broadcast channels. The protocol includes three sub-protocols using the W state, as well as the conventional anonymous entanglement protocol, to construct a complete anonymous communication protocol. We also examine the correctness and security of the proposed protocol.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Multidisciplinary Sciences
Sebastian Philipp Neumann, Alexander Buchner, Lukas Bulla, Martin Bohmann, Rupert Ursin
Summary: We have successfully achieved long-distance distribution of entanglement between Austria and Slovakia, directly distributing polarization-entangled photon pairs through a 248 km optical fiber. Through temporal filtering and automated polarization stabilization, we have achieved stable detection rates and high visibility, paving the way for low-maintenance, ultra-stable quantum communication over long distances.
NATURE COMMUNICATIONS
(2022)
Article
Computer Science, Information Systems
Raveen Wijewickrama, Sameer Anis Dohadwalla, Anindya Maiti, Murtuza Jadliwala, Sashank Narain
Summary: This paper presents SkinSense, a vibration-based communication protocol that creates a low-bandwidth and covert communication channel between mobile and wearable devices using the human body/skin as a communication medium. The comprehensive evaluation shows that SkinSense can achieve stable high bandwidth and can be used as a practical communication side-channel.
INTERNET OF THINGS
(2023)
Article
Automation & Control Systems
Jie Zhang, Xusheng Yang, Wen-An Zhang
Summary: This article studies the Bayesian filtering problem for nonlinear systems with heavy-tailed noises. It proposes a progressive Bayesian filtering framework to overcome the limitations of Gaussian distribution or particle sets in expressing the posterior probability density distribution. The framework divides the measurement update into steps and uses intermediate posterior distributions as importance proposal distributions to improve the approximation of posterior probability density distributions. Termination conditions are also proposed to enhance the robustness against outliers. A simulation example is provided to illustrate the effectiveness and superiority of the proposed framework.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2023)
Article
Physics, Multidisciplinary
V. S. Gomes, P. R. Dieguez, H. M. Vasconcelos
Summary: The realism-based nonlocality (RBN) is a measure that differs from Bell's nonlocality. This study presents an analytical proof for the unitary invariance of RBN and its behavior under local quantum noise. The results demonstrate the limitations of RBN by the initial temperature and its asymptotic decay. Moreover, the study shows that RBN can capture undetectable nonlocal aspects even for non-discordant states.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2022)
