Article
Chemistry, Multidisciplinary
Tianyi Wang, Xiaoguang Chen, Jianxiong Liang
Summary: This paper proposes a method for generating 4-qubit cluster states using multi-coin quantum walks, simplifying the process of entanglement generation. Additionally, a method for preparing 4-qubit cluster states with quantum circuits is proposed to facilitate their use in quantum computing.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Multidisciplinary
Kanin Aungskunsiri, Sakdinan Jantarachote, Kruawan Wongpanya, Ratthasart Amarit, Pongpun Punpetch, Sarun Sumriddetchkajorn
Summary: We demonstrate quantum random number generation using a photon-number detection scheme and silicon photomultiplier technology. Our method accurately resolves photon numbers using detector response signals, which are then digitized into a stream of 4-bit sequences. The generated random bits pass statistical randomness validation and this scheme can be implemented using inexpensive components, with the potential for miniaturization into a plug-and-play portable cryptographic device.
Article
Physics, Applied
Kanin Aungskunsiri, Ratthasart Amarit, Kruawan Wongpanya, Sakdinan Jantarachote, Wittawat Yamwong, Siriporn Saiburee, Sataporn Chanhorm, Apichart Intarapanich, Sarun Sumriddetchkajorn
Summary: The study proposes a method using quantum tunneling diodes to generate true randomness, which can be applied in systems requiring random numbers like portable communication devices, with the advantages of low cost and easy implementation.
APPLIED PHYSICS LETTERS
(2021)
Article
Multidisciplinary Sciences
Conrad Strydom, Mark Tame
Summary: This study investigates the generation of t-designs on superconducting quantum computers using a measurement-based approach. Results show that depolarising noise during the measurement process affects the realization of the designs, indicating the need for further work in reducing noise in these devices.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Electrical & Electronic
Lilia Maria Santos Dias, Tiago Filipe Santos Silverio, Rute Amorim Sa Ferreira, Paulo Sergio Brito Andre
Summary: The rapid development of digital ecosystems requires fast and reliable algorithms to generate random numbers. Speckle-based imaging provides an opportunity for these generators to produce unpredictable and irreproducible patterns, which can be used for remote cryptographic key storage and distribution.
IET OPTOELECTRONICS
(2022)
Article
Physics, Multidisciplinary
Henning Schomerus
Summary: The author employs random-matrix methods to establish and solve statistical models of noisy nonunitary dynamics in monitored quantum systems, covering scenarios of random dynamics and measurements of varied qubit strengths. Entanglement plays a crucial role, conditioning the monitored qubit's state, which in turn imposes statistical constraints on the rest of the system.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Computer Science, Information Systems
Md Saiful Islam
Summary: This paper investigates the potential of electrocardiogram (ECG) signals as a source of entropy for cryptographic random bit generation. A new method is proposed to process a single heartbeat ECG signal and obtain a long random bit sequence (RBS). The method has been tested and shown to efficiently generate long RBSs for cryptographic applications.
JOURNAL OF KING SAUD UNIVERSITY-COMPUTER AND INFORMATION SCIENCES
(2022)
Article
Physics, Multidisciplinary
Xing Lin, Rong Wang, Shuang Wang, Zhen-Qiang Yin, Wei Chen, Guang-Can Guo, Zheng-Fu Han
Summary: Generating random numbers is important in scientific applications. Quantum devices can generate true random numbers based on quantum mechanics. In order to address the deviation between existing random number generation models and real-world devices, we propose a quantum random number generation protocol and demonstrate it experimentally. Our protocol makes no assumptions about the source and only requires certain reasonable assumptions about trusted two-dimensional measurements. We achieve a randomness generation rate of over 1 Mbps with a universal composable security parameter of 10(-10).
PHYSICAL REVIEW LETTERS
(2022)
Article
Quantum Science & Technology
Wanyang Dai
Summary: This study presents a general spherical coordinate formula for a quantum state of an n-qubit register and investigates the n-qubit operation rules on an (n + 1)-sphere. The newly developed angle-based rules simplify the quantum computation by reducing complex operations to simple addition and subtraction, similar to those in a conventional computer. These rules are implemented through measurement-based feedback controls and quantum entanglements. Additionally, the study derives the scaling limits for n-qubit quantum computer-based queueing systems under different heavy traffic regimes, considering both time and space scaling parameters, as well as variable qubit numbers.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Physics, Multidisciplinary
Sergio A. Ortega, Miguel A. Martin-Delgado
Summary: Semiclassical walks are algorithms that combine classical and quantum dynamics, and have various applications such as optimization. By encoding quantum evolution into classical walks, we applied this algorithm to Szegedy's quantum walk and demonstrated its effectiveness using simulations on inhomogeneous symmetric graphs. Furthermore, we showed its superiority over classical PageRank algorithm in ranking nodes of symmetric graphs and validated it experimentally on a real quantum computer using IBM Quantum platform.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2023)
Article
Quantum Science & Technology
Yusuke Yoshie, Kiyoto Yoshino
Summary: This paper presents a discrete-time quantum walk model for finding one of the edges of a given subgraph in a complete graph. By constructing a perturbed quantum walk, we can quickly locate one of the edges, achieving quantum searching.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Physics, Multidisciplinary
Kosuke Mitarai, Keisuke Fujii
Summary: The study demonstrates a method to simulate certain types of non-local operations by sampling a set of local operations, which can be used to evaluate the expectation value of observables in a quantum circuit. It also proposes a strategy to decompose a two-qubit gate into a sequence of single-qubit operations, enabling more efficient operations in quantum computing.
NEW JOURNAL OF PHYSICS
(2021)
Article
Quantum Science & Technology
Shion Samadder Chaudhury, Sabyasachi Dutta
Summary: This paper presents a fully quantum multi-secret sharing scheme, where a quantum trap code is modified to reconstruct more secret states as more participants combine their shares. A discrete-time quantum walk-based technique is introduced to reduce the dimension of shares, making the scheme more practical.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Dai-Gyoung Kim, Arfan Anjum, Muhammad Asif Farooq, Asif Mushtaq, Zahid Hussain Shamsi
Summary: In this paper, an innovative approach is proposed for quantum teleportation of multi-qubit physical state into an error correctable multi-qubit logical state. An efficient quantum error correction scheme is applied to detect and correct errors in the teleported logical state. The proposed mechanism is substantiated by teleporting an eight-qubit physical state via a four-qubit cluster state.
RESULTS IN PHYSICS
(2023)
Article
Quantum Science & Technology
Jia-yin Peng, Zhen Yang, Liang Tang, Jia-sheng Peng
Summary: This paper studies multi-party quantum communication of arbitrary single-qubit states. It proposes two new schemes for synchronous broadcasting of arbitrary complex coefficient single-qubit states to multiple receivers, as well as ensuring the difference of quantum information among the receivers for quantum multi-cast communications.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Physics, Multidisciplinary
Ilaria Pizio, Shivani Singh, C. M. Chandrashekar, Matteo G. A. Paris
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2019)
Article
Quantum Science & Technology
Prateek Chawla, Roopesh Mangal, C. M. Chandrashekar
QUANTUM INFORMATION PROCESSING
(2020)
Article
Multidisciplinary Sciences
C. Huerta Alderete, Shivani Singh, Nhung H Nguyen, Daiwei Zhu, Radhakrishnan Balu, Christopher Monroe, C. M. Chandrashekar, Norbert M. Linke
NATURE COMMUNICATIONS
(2020)
Article
Quantum Science & Technology
S. Srikara, C. M. Chandrashekar
QUANTUM INFORMATION PROCESSING
(2020)
Article
Physics, Multidisciplinary
Pragati Gupta, C. M. Chandrashekar
NEW JOURNAL OF PHYSICS
(2020)
Article
Optics
Mrittunjoy Guha Majumdar, C. M. Chandrashekar
Summary: This paper proposes a scheme to generate and control polarization-path-frequency entanglement using a polarization-controlled quantum walk. The dynamics are controlled using interferometric devices and electro-optic devices to manipulate the polarization, path, and frequency degrees of freedom. The controllability of the entanglement between the three degrees of freedom is demonstrated, and the effect of noise on the entanglement is modeled.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2022)
Article
Optics
Akshay Kannan Sairam, C. M. Chandrashekar
Summary: This paper studies the advantages of using path-polarization hyperentangled states of photon pairs in the presence of noise that only affects one of the paths. The resilience of the path-polarization hyperentangled probe state against noise is demonstrated using entanglement negativity, entanglement witnesses, and Bell nonlocality.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Prateek Chawla, Adithi Ajith, C. M. Chandrashekar
Summary: This work presents a protocol that generates entanglement between directly connected nodes in a quantum network, enabling secure communication. Simulation results demonstrate the practical feasibility of this protocol for secure communication over any random network topology.
Article
Optics
P. A. Ameen Yasir, Abhaya S. Hegde, C. M. Chandrashekar
Summary: Quantum walks are versatile tools not only for quantum algorithms but also for modeling and simulating quantum dynamics in complex physical processes. The split-step quantum walk, a discrete-time variant, is closely related to Dirac cellular automata and topological insulators, which rely on position-dependent control of evolution operators. In this study, an easily manipulable optical setup for split-step operators is proposed, along with a position-dependent coin operation, enabling a table-top setup of generalized split-step walks. Additionally, an optical implementation for the coin operation is proposed, allowing for the realization of electric quantum walks, control of localization dynamics, and emulation of space-time curvature effects. A setup involving various optical components is also proposed to realize any t-step split-step quantum walk.
Article
Optics
K. Muhammed Shafi, A. Padhye, C. M. Chandrashekar
Summary: This study demonstrates the advantage of using heralded single-photons entangled in polarization and path degree of freedom for quantum illumination over traditional methods. Non-interferometric measurements along multiple paths can effectively isolate the signal from background noise and outperform traditional methods, even at low signal-to-noise ratios.
Article
Physics, Multidisciplinary
Prateek Chawla, C. V. Ambarish, C. M. Chandrashekar
JOURNAL OF PHYSICS COMMUNICATIONS
(2019)
Article
Optics
Shivani Singh, C. M. Chandrashekar, Matteo G. A. Paris
Article
Physics, Multidisciplinary
Arindam Mallick, Sanjoy Mandal, Anirban Karan, C. M. Chandrashekar
JOURNAL OF PHYSICS COMMUNICATIONS
(2019)
Article
Optics
N. Pradeep Kumar, Radhakrishna Balu, Raymond Laflamme, C. M. Chandrashekar