Article
Materials Science, Multidisciplinary
Luping Zhang, Fang Jia, Huan Zhang, Wei Ye, Ying Xia, Liyun Hu, Jiehui Huang
Summary: This study proposes a scheme for improving entanglement using number-conserving generalized superposition of products (GSP) operation. It is found that both single-mode and two-mode-symmetric GSP operations can effectively enhance entanglement. Compared to other non-Gaussian operations, this scheme shows better entanglement performance at a small amplitude level. In addition, when used for teleportation, this scheme achieves the optimal teleportation fidelity.
RESULTS IN PHYSICS
(2022)
Article
Physics, Multidisciplinary
Wei Ye, Ying Guo, Huan Zhang, Ying Xia, Yun Mao
Summary: The study shows that performing high-order GSP operations on the STS benefits the existence of photon-antibunching effect, sub-Poissonian distribution, and partial negativity of the WF at low squeezing levels. The PSTA-STS outperforms other non-Gaussian resources in terms of sub-Poissonian distribution and partial negativity of the WF.
Article
Quantum Science & Technology
Luca Innocenti, Lukas Lachman, Radim Filip
Summary: Experimentally certifying the nonclassicality of quantum states in an optimal and efficient way remains a fundamental challenge. This study introduces a novel approach that is directly applicable to experimental realities and demonstrates its superiority in various scenarios. The findings represent a significant milestone towards a complete characterization of detectable nonclassicality in experimental implementations.
NPJ QUANTUM INFORMATION
(2022)
Article
Physics, Multidisciplinary
Seyedeh Robabeh Miry, Mohammad Javad Faghihi, Hajar Mahmoudi
Summary: This paper introduces different classes of entangled cat states associated with generalized displaced Fock states using the formalism of nonlinear coherent states. The entanglement between subsystems of the quantum states is studied through the measure of concurrence, along with nonclassicality criteria such as Mandels Q parameter and quadrature squeezing. Numerical results show significant entanglement values, sub-Poissonian statistics, and squeezing properties, indicating the potential use of these states as nonclassical entangled states. Additionally, the Vogel function for the quantum states goes beyond the characteristic function of the ground state, demonstrating the nonclassicality of the introduced states.
Article
Physics, Multidisciplinary
Sergey Filippov, Alena Termanova
Summary: In the realm of continuous-variable states and local Gaussian channels, the assumption that the optimal initial state with the most robust entanglement is Gaussian is proven to be false. Specific non-Gaussian two-mode states are shown to remain entangled under the effect of deterministic local attenuation or amplification. These results challenge the Gaussian world paradigm in quantum information science.
Article
Physics, Multidisciplinary
B. Kuehn, W. Vogel, V Thiel, S. Merkouche, B. J. Smith
Summary: Measures of quantum properties are essential for understanding the differences between quantum and classical systems, and quantifying resources for quantum technologies. By comparing different filtered versions of the Glauber-Sudarshan P function, this study explores their ability to reveal nonclassical effects of light. It is shown that non-Gaussian filtered quasiprobabilities can uncover significant nonclassical effects even at low efficiencies.
PHYSICAL REVIEW LETTERS
(2021)
Article
Quantum Science & Technology
Mahathi Vempati, Saumya Shah, Nirman Ganguly, Indranil Chakrabarty
Summary: This paper introduces the class of A-unital channels and proves that they are the largest class of conditional entropy non-decreasing channels. The relationship between A-unital channels and other classes of channels relevant to the resource theory of entanglement is also studied. Similar results are proven for the class of ACVENN states and the relationship between the maximum and minimum conditional entropy of a state and its von Neumann entropy is established. The definition of A-unital channels naturally allows for a procedure to determine membership of channels in this class.
Article
Mathematics, Interdisciplinary Applications
A. C. Tzemos, G. Contopoulos
Summary: We study the Bohmian dynamics of a large class of bipartite systems of non-ideal qubit systems, by modifying the basic physical parameters of an ideal two-qubit system, made of coherent states of the quantum harmonic oscillator. First we study the case of coherent states with truncated energy levels and large amplitudes. Then we study non-truncated coherent states but with small amplitudes and finally a combination of the above cases. In all cases we find that the chaotic Bohmian trajectories are approximately ergodic. We also study the number and the spatial arrangement of the nodal points of the wavefunction and their role both in the formation of chaotic-ergodic trajectories, and in the emergence of ordered trajectories. Our results have strong implications on the dynamical establishment of Born's rule.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Optics
Natalia Herrera Valencia, Vatshal Srivastav, Saroch Leedumrongwatthanakun, Will McCutcheon, Mehul Malik
Summary: This passage discusses the spatial structure of photons and its applications in quantum physics. Through experiments, it confirms entanglement between photon pairs and studies quantum correlations between different LG mode groups. The text also proposes precise measurement methods for high-dimensional entanglement certification.
Article
Quantum Science & Technology
Brahim Amghar, Mohammed Daoud
Summary: In this study, we investigated the geometrical features arising from the second Hopf fibration for a two-qubit system without using quaternionic language. Furthermore, we explored the metric tensor and the SO(4) non-abelian gauge field defined on the S-4-base in relation to the entanglement quantified by the Wootters concurrence on the associated Hopf bundle. Finally, by transforming an entangled two-qubit state in the Schmidt form, we examined the different quantum phases obtained by this state under U(2) x U(2) local unitary operations with respect to the entanglement and geometry of the corresponding state manifold.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Quantum Science & Technology
Benjamin Lovitz, Nathaniel Johnston
Summary: This paper extends the theory of discriminating quantum states in the context of local measurements and shared entangled resources. The maximum distinguishability is found to be determined by the properties of the resource state. Moreover, the paper explores the topic of entangled subspaces and presents novel constructions.
Article
Physics, Multidisciplinary
Li-Yi Hsu
Summary: This article discusses the problem of local quantum state marking, where Alice and Bob are asked to correctly mark the states of given quantum systems through local operations and classical communication. The research shows that Alice and Bob can perform perfect local quantum state marking given four 4 circle times 4 systems. They can also achieve perfect local state marking in the cases of N = 5, 6 with specific target states. However, it is conjectured that it is impossible for them to achieve local quantum state marking with any seven target states, as they cannot complete the task in the simplest case.
NEW JOURNAL OF PHYSICS
(2023)
Article
Optics
Waldemar Klobus, Pawel Cieslinski, Lukas Knips, Pawel Kurzynski, Wieslaw Laskowski
Summary: By transferring entanglement between continuous-variable systems and qubits, we are able to witness Gaussian entanglement between the systems.
Article
Physics, Multidisciplinary
Xuanxuan Xin, Shiwen He, Yongxing Li, Chong Li
Summary: Ideal deterministic quantum communication tasks require maximally entangled channels. However, due to various decoherence mechanisms, the maximally entangled channel is inevitably degraded to a generally entangled one, decreasing the performance of quantum communication. This paper proposes an alternative scheme to achieve deterministic joint remote state preparation using a non-maximally entangled channel. The scheme only requires two non-entangled ancillaries, eliminating the need for entanglement purification or distillation. The investigation shows that remote state preparation would never fail theoretically, regardless of the type of quantum channel used, providing a feasible way for practical quantum networks.
Article
Computer Science, Information Systems
Barbara Wolnik, Maciej Dziemianczuk, Bernard De Baets
Summary: In this paper, the authors investigate non-uniform elementary cellular automata and their relationship with number conservation. They provide a comprehensive characterization of number-conserving cellular automata on finite grids with both periodic and null boundary conditions. The obtained characterization allows for the enumeration of all number-conserving non-uniform elementary cellular automata, revealing a surprising connection to the Fibonacci sequence.
INFORMATION SCIENCES
(2023)
Article
Physics, Multidisciplinary
Shoukang Chang, Chaoping Wei, Huan Zhang, Ying Xia, Wei Ye, Liyun Hu
Article
Quantum Science & Technology
Wei Ye, Hai Zhong, Xiaodong Wu, Liyun Hu, Ying Guo
QUANTUM INFORMATION PROCESSING
(2020)
Article
Optics
Wei Ye, Ying Guo, Huan Zhang, Hai Zhong, Yun Mao, Liyun Hu
Summary: The study introduces a quantum catalysis (QC) approach to enhance the performance of discrete-modulated (DM) MDI-CVQKD system, including increasing achievable secret key rate and maximal transmission distance. Numerical simulation results demonstrate that the QC-based approach can effectively improve system performance and offer better improvements for extreme cases as well.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Cunjin Liu, Min Yu, Wei Ye, Huan Zhang, Liyun Hu
RESULTS IN PHYSICS
(2020)
Article
Physics, Multidisciplinary
Wei Ye, Ying Guo, Huan Zhang, Ying Xia, Yun Mao
Summary: The study shows that performing high-order GSP operations on the STS benefits the existence of photon-antibunching effect, sub-Poissonian distribution, and partial negativity of the WF at low squeezing levels. The PSTA-STS outperforms other non-Gaussian resources in terms of sub-Poissonian distribution and partial negativity of the WF.
Article
Optics
Min Yu, Huan Zhang, Wei Ye, Kuizheng Zhang, Ying Xia, Liyun Hu
Summary: Theoretical investigation was conducted on the generation of a novel non-Gaussian entangled state using single-photon catalytic quantum scissors on an input two-mode squeezed vacuum state. The effective operator of the CQS, related to beam splitter transmittance, was derived. Results showed that higher success probability and fidelity can be achieved with appropriate parameters. The entanglement properties, including EPR correlation and two-mode squeezing effect, were discussed, indicating that the CQS operation efficiently enhances entanglement for potential use in continuous-variable quantum communication.
Article
Optics
Shoukang Chang, Wei Ye, Huan Zhang, Liyun Hu, Jiehui Huang, Sanqiu Liu
Summary: The study found that the interferometer based on Kerr phase shift shows significant enhancement in phase sensitivity and quantum Fisher information compared to the linear phase shift interferometer, even in the presence of photon losses. Moreover, in the absence of photon losses, the phase sensitivity of the Kerr phase shift interferometer can exceed the standard quantum limit and the Heisenberg limit.
