Quantum Systems and Their Applications

Topic Information

Dear Colleagues,

Unlike classical systems, quantum systems display properties such as superposition, entanglement, and wave-particle duality, leading to phenomena that defy our everyday intuition. These systems play a crucial role in modern physics and technology, forming the basis for quantum computing, cryptography, and advanced materials. Quantum systems are essential for exploring the fundamental nature of the universe and developing next-generation technologies. In this Topic, research areas may include (but are not limited to) quantum information, quantum computing, quantum simulation, quantum communication, quantum algorithm design with unitary and nonunitary operators, quantum cryptography and cybersecurity, open and dissipative quantum systems, non-Hermitian quantum systems with different symmetries, quantum-based new energy storage and quantum battery, quantum thermal dynamics and quantum statistics, and quantum computers for all real-world applications.

Prof. Dr. Chao Zheng
Prof. Dr. Jim Freericks
Topic Editors

Keywords

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Entropy entropy	2.0	5.2	1999	21.8 Days	CHF 2600	Submit
Quantum Reports quantumrep	1.3	3.0	2019	18.5 Days	CHF 1400	Submit
Symmetry symmetry	2.2	5.3	2009	17.1 Days	CHF 2400	Submit
Universe universe	2.6	5.2	2015	22.6 Days	CHF 1600	Submit
Physics physics	1.8	3.1	2019	25.9 Days	CHF 1400	Submit

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Published Papers (3 papers)

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All Entropy Quantum Reports Symmetry Universe Physics

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9 pages, 406 KB  

Open AccessArticle

A Proposed Test for the Gravitational Tunnel Effect

by Alfonso González Jiménez, Enderson Falcón Gómez, Isabel Carnoto Amat and Luis Enrique García Muñoz

Universe 2025, 11(9), 291; https://doi.org/10.3390/universe11090291 - 28 Aug 2025

Viewed by 200

Abstract

This article addresses the problem of the tunnel effect with a gravitational potential. Specifically, the quasiclassical formulation is used here, and the Wentzel–Kramers–Brillouin approximation is applied to the potential. This allows the problem to be solved for different configurations with different values (masses, [...] Read more.

This article addresses the problem of the tunnel effect with a gravitational potential. Specifically, the quasiclassical formulation is used here, and the Wentzel–Kramers–Brillouin approximation is applied to the potential. This allows the problem to be solved for different configurations with different values (masses, distances, etc.). The chosen values are intended to provide a clear comparison when varying the different parameters. Furthermore, feasible values are considered for practically replicating the experiment without resorting to astrophysical methods. Due to the low intensity of the gravitational force, these experiments will be difficult to replicate, but it is possible to improve some parameters at the expense of others. Full article

(This article belongs to the Topic Quantum Systems and Their Applications)

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18 pages, 912 KB  

Open AccessArticle

A Guiding Principle for Quantum State Discrimination in the Real-Spectrum Phase of P-Pseudo-Hermitian Systems

by Qinliang Dong, Xueer Gao, Zhihang Liu, Hui Li, Jingwei Wen and Chao Zheng

Entropy 2025, 27(8), 836; https://doi.org/10.3390/e27080836 - 6 Aug 2025

Viewed by 386

Abstract

Quantum state discrimination (QSD) is a fundamental task in quantum information processing, improving the computation efficiency and communication security. Non-Hermitian (NH) PT-symmetric systems were found to be able to discriminate two quantum states better than the Hermitian strategy. In this work, we propose [...] Read more.

Quantum state discrimination (QSD) is a fundamental task in quantum information processing, improving the computation efficiency and communication security. Non-Hermitian (NH) PT-symmetric systems were found to be able to discriminate two quantum states better than the Hermitian strategy. In this work, we propose a QSD approach based on P-pseudo-Hermitian systems with real spectra. We theoretically prove the feasibility of realizing QSD in the real-spectrum phase of a P-pseudo-Hermitian system, i.e., two arbitrary non-orthogonal quantum states can be discriminated by a suitable P-pseudo-Hermitian Hamiltonian. In detail, we decide the minimal angular separation between two non-orthogonal quantum states for a fixed P-pseudo-Hermitian Hamiltonian, and we find the orthogonal evolution time is able to approach zero under suitable conditions, while both the trace distance and the quantum relative entropy are employed to judge their orthogonality. We give a criterion to choose the parameters of a P-pseudo-Hermitian Hamiltonian that evolves the two initial orthogonal states faster than a fixed arbitrary PT-symmetric one with an identical energy difference. Our work expands the NH family for QSD, and can be used to explore real quantum systems in the future. Full article

(This article belongs to the Topic Quantum Systems and Their Applications)

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15 pages, 712 KB  

Open AccessArticle

Extracting Correlations in Arbitrary Diagonal Quantum States via Weak Couplings and Auxiliary Systems

by Hui Li, Chao Zheng, Yansong Li and Xian Lu

Symmetry 2025, 17(8), 1233; https://doi.org/10.3390/sym17081233 - 4 Aug 2025

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Abstract

In this work, we introduce a novel method to extract correlations in diagonal quantum states in multi-particle quantum systems, addressing a significant limitation of traditional approaches that require prior knowledge of the density matrices of quantum states. Instead of relying on classical information [...] Read more.

In this work, we introduce a novel method to extract correlations in diagonal quantum states in multi-particle quantum systems, addressing a significant limitation of traditional approaches that require prior knowledge of the density matrices of quantum states. Instead of relying on classical information processing, our method is based on weak couplings and ancillary systems, eliminating the need for classical communication, optimization, and complex calculations. The concept of mutually unbiased bases is intrinsically linked to symmetry, as it entails the uniform distribution of quantum states across distinct bases. Within the framework of our theoretical model, mutually unbiased bases are employed to facilitate weak measurements and to function as the post-selected states. To quantify the correlations in the initial state, we employ the trace distance between the initial state and the product of its marginal states, and illustrate the feasibility and effectiveness of our approach. We generalize the approach to accommodate high-dimensional multi-particle systems for potential applications in quantum information processing and quantum networks. Full article

(This article belongs to the Topic Quantum Systems and Their Applications)

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