Papers
Live trends in quantum computing research, updated daily from arXiv.
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$\mathcal{PT}$-symmetric cavity magnomechanics with gain-assisted transparency and amplification
Cham Oumie, Wu-Ming Liu, Kashif Ammar Yasir·Dec 9, 2025
We investigate magnomechanically induced transparency in a parity-time-symmetric cavity magnomechanical system with traveling-field-induced non-Hermiticity. The setup consists of a microwave cavity mode coupled to magnons in a single-crystal yttrium ...
Internal spaces of fermion and boson fields, described with the superposition of odd and even products of $γ^{a}$, enable understanding of all the second-quantised fields in an equivalent way
N. S. Mankoč Borštnik·Dec 9, 2025
Using the odd and even ``basis vectors'', which are the superposition of odd and even products of $γ^a$'s, to describe the internal spaces of the second quantised fermion and boson fields, respectively, offers in even-dimensional spaces, like it is $...
Comparing quantum channels using Hermitian-preserving trace-preserving linear maps: A physically meaningful approach
Arindam Mitra, Jatin Ghai·Dec 8, 2025
In quantum technologies, quantum channels are essential elements for the transmission of quantum states. The action of a quantum channel usually introduces noise in the quantum state and thereby reduces the information contained in it. These are math...
Enhanced charging power in nonreciprocal quantum battery by reservoir engineering
Qi-Yin Lin, Guang-Zheng Ye, Can Li +2 more·Dec 8, 2025
We propose a scheme to achieve a nonreciprocal quantum battery (QB) in the non-Hermitian (NH) system, which can overcome the intrinsic dissipation and reverse flow constraints. The design is based on a charger and a battery, which are coherently coup...
Anomalous Wave-Packet Dynamics in One-Dimensional Non-Hermitian Lattices
Yanyan He, Tomoki Ozawa·Dec 8, 2025
Non-Hermitian (NH) systems have attracted great attention due to their exotic phenomena beyond Hermitian domains. Here we study the wave-packet dynamics in general one-dimensional NH lattices and uncover several unexpected phenomena. The group veloci...
Quantum geometrical effects in non-Hermitian systems
Anton Montag, Tomoki Ozawa·Dec 8, 2025
We explore the relation between quantum geometry in non-Hermitian systems and physically measurable phenomena. We highlight various situations in which the behavior of a non-Hermitian system is best understood in terms of quantum geometry, namely the...
Non-Hermitian Bose-Hubbard-like quantum models
Miloslav Znojil·Dec 8, 2025
Among all of the non-Hermitian large-tridiagonal-matrix quantum Hamiltonians we choose a subclass with the structure resembling the ``benchmark'' realistic Bose-Hubbard model. We demonstrate that this choice can be declared user-friendly in the sense...
The uncharted space of non-Hermitian solutions to the Hartree-Fock and Kohn-Sham equations
Matthias Ernzerhof, Mohamed Loutis, Pierre-Olivier Roy +1 more·Dec 7, 2025
Many problems in physical chemistry involve systems that are coupled to an environment, such as a molecule interacting with an adjacent surface, possibly resulting in meta-stable molecular states where electron density is transferred to the surface. ...
Witnessing Spin-Orbital Entanglement using Resonant Inelastic X-Ray Scattering
Zecheng Shen, Shuhan Ding, Zijun Zhao +2 more·Dec 7, 2025
Entanglement plays a central role in quantum technologies, yet its characterization and control in materials remain challenging. Recent developments in spectrum-based entanglement witnesses have enabled new strategies for quantifying many-body entang...
Exploring the topology induced by non-Markovian Liouvillian exceptional points
Hao-Long Zhang, Yan Wang, Wen Ning +6 more·Dec 6, 2025
Non-Hermitian (NH) systems can display exotic topological phenomena without Hermitian counterparts, enabled by exceptional points (EPs). So far, investigations of NH topology have been restricted to EPs of the NH Hamiltonian, which governs the system...
Trade-offs between Quantum and Classical Resources in the Linear Combination of Unitaries
Kaito Wada, Hiroyuki Harada, Yasunari Suzuki +3 more·Dec 6, 2025
The randomized linear combination of unitaries (LCU) method with many applications to early fault-tolerant quantum computing algorithms has been proposed. This quantum algorithm computes the same expectation values as the original, fully coherent LCU...
Quantum geometry and $X$-wave magnets with $X=p,d,f,g,i$
Motohiko Ezawa·Dec 5, 2025
Quantum geometry is a differential geometry based on quantum mechanics. It is related to various transport and optical properties in condensed matter physics. The Zeeman quantum geometry is a generalization of quantum geometry including the spin degr...
Quantum-Inspired Optimization through Qudit-Based Imaginary Time Evolution
Erik M. Åsgrim, Ahsan Javed Awan·Dec 4, 2025
Imaginary-time evolution has been shown to be a promising framework for tackling combinatorial optimization problems on quantum hardware. In this work, we propose a classical quantum-inspired strategy for solving combinatorial optimization problems w...
Universal quantum control over non-Hermitian continuous-variable systems
Zhu-yao Jin, Jun Jing·Dec 4, 2025
Current studies of non-Hermitian continuous-variable systems heavily revolved around the singularities in the eigen-spectrum by mimicking their discrete-variable counterparts. The growing discussions over the nonunitary features in time evolution, ho...
Dissipative Yao-Lee Spin-Orbital Model: Exact Solvability and $\mathcal{PT}$ Symmetry Breaking
Zihao Qi, Yuan Xue·Dec 3, 2025
Exactly solvable dissipative models provide an analytical tool for studying the relaxation dynamics in open quantum systems. In this work, we study an exactly solvable model based on an anisotropic variant of the Yao-Lee spin-orbital model, with diss...
Thermodynamics of an Open $\mathcal{PT-}$Symmetric Quantum System
Baibhab Bose, Devvrat Tiwari, Subhashish Banerjee·Dec 3, 2025
For a subclass of a general $\mathcal{PT}-$symmetric Hamiltonian obeying anti-commutation relation with its conjugate, a Hermitian basis is found that spans the bi-orthonormal energy eigenvectors. Using the modified projectors constructed from these ...
Sympathetic Cooling of Levitated Optomechanics through Nonreciprocal Coupling
Jialin Li, Guangyu Zhang, Zhang-qi Yin·Dec 3, 2025
Optomechanical cooling of levitated nanoparticles has become an essential topic in modern quantum physics, providing a platform for exploring macroscopic quantum phenomena and high-precision sensing. However, conventional cavity-assisted cooling is f...
Observation of non-Hermitian many-body phase transition in a Rydberg-atom array
Yao-Wen Zhang, Biao Xu, Yijia Zhou +8 more·Dec 2, 2025
Non-Hermitian quantum mechanics with parity-time (PT) symmetry offers a powerful framework for exploring the complex interplay of dissipation and coherent interactions in open quantum systems. While PT-symmetry breaking has been studied in various ph...
Dynamic Modulation of Long Range Photon Magnon Coupling
Alban Joseph, Mawgan A. Smith, Martin P. Weides +1 more·Dec 2, 2025
Evidence of non-hermitian behavior has been recently demonstrated in cavity magnonics, including the emergence of mode level attraction and exceptional points in spectroscopic measurements. This work demonstrates experimental evidence of time-domain ...
Generalizing fusion rules by shuffle: Symmetry-based classifications of nonlocal systems constructed from similarity transformations
Yoshiki Fukusumi, Taishi Kawamoto·Dec 1, 2025
We study fusion rings, or symmetry topological field theories (SymTFTs), which lie outside the non-negative integer matrix representation (NIM-rep), by combining knowledge from generalized symmetry and that from pseudo-Hermitian systems. By applying ...