Papers
Perturbative hydrogenic Lamb shifts and radiative decay rates -- an so(4,2)-based algebraic approach
Gernot Alber·Apr 8, 2026
It is shown that algebraic techniques based on the Lie algebra so(4,2) provide efficient tools for evaluating Lamb shifts and radiative decay rates for hydrogenic energy eigenstates as they systematically exploit the intrinsic symmetry of the hydroge...
Towards National Quantum Communication in Europe: Planning and Sizing Terrestrial QKD Networks
Sebastian Raubitzek, Werner Strasser, Sebastian Ramacher +3 more·Apr 8, 2026
The European Union is developing the European Quantum Communication Infrastructure (EuroQCI) as a pan-European network to provide secure communication capabilities across Member States, including governmental and critical-infrastructure domains. Whil...
Quantum simulation of baryon scattering in SU(2) lattice gauge theory
João Barata, Juan Hormaza, Zhong-Bo Kang +1 more·Apr 8, 2026
We present a first real-time study of hadronic scattering in a $(1+1)$-dimensional SU(2) lattice gauge theory with fundamental fermions using tensor-network techniques. Working in the gaugeless Hamiltonian formulation, we investigate scattering proce...
Broken Quantum: A Systematic Formal Verification Study of Security Vulnerabilities Across the Open-Source Quantum Computing Simulator Ecosystem
Dominik Blain·Apr 8, 2026
Quantum computing simulators form the classical software foundation on which virtually all quantum algorithm research depends. We present Broken Quantum, the first comprehensive formal security audit of the open-source quantum computing simulator eco...
Attosecond quantum spectroscopy with entangled photon pairs
Zijian Lyu, Fengxiao Sun, Sili Yi +6 more·Apr 8, 2026
Bright squeezed light from parametric down-conversion in the infrared (IR) frequency range has triggered the emergence of attosecond quantum optics -- a new research field at the interface of quantum optics, strong-field physics, and attosecond techn...
Strong-field ionization of atoms with bright squeezed vacuum light
Haodong Liu, Xiaoxiao Long, Peizeng Li +2 more·Apr 8, 2026
Strong-field ionization is the cornerstone of attosecond physics, which has been extensively studied under coherent-state driving. Recently, the interface between attosecond physics and quantum optics has emerged as a new frontier. Yet, owing to expe...
Magnon harmonic generation in antiferromagnets: Dynamical symmetry enriched by symmetry breaking
Yuto Jita, Minoru Kanega, Takumi Ogawa +2 more·Apr 8, 2026
In recent years, techniques of intense THz laser have enabled us to experimentally observe nonlinear spin dynamics in antiferromagnets since the elementary excitations such as magnons reside on a THz to GHz range in antiferromagnets and THz laser thu...
Environment-Assisted Decoherence Suppression of Optical Non-Gaussian States
Akihiro Machinaga, Naoki Aritomi, Ryoga Sakurada +10 more·Apr 8, 2026
Optical loss is a common bottleneck in photonic quantum information processing, undermining the quantum advantage over classical approaches. Although several countermeasures, such as quantum distillation and error correction, have been proposed, they...
Steady-State Statistical Modeling of Digitally Stabilized Laser Frequency with Markov-State Feedback
Swarnav Banik, Elliot Greenwald, Xing Pan·Apr 8, 2026
Laser frequency stabilization is conventionally analyzed using continuous-time control theory, which accurately models analog feedback but is insufficient for digital implementations where quantization, sampling, and stochastic noise shape the dynami...
Quantum target ranging with Hetero-Homodyne detection
Sangwoo Jeon, Yonggi Jo, Jihwan Kim +4 more·Apr 8, 2026
Quantum target ranging, which estimates a target position using entangled photon pairs, is known to offer an error-probability advantage over classical ranging strategies. Yet, realizing this advantage in practice remains challenging, as an existing ...
Computing In Spintronic Memory: A Thermal Perspective
Patrick Miller, Hüsrev Cilasun, Sachin S. Sapatnekar +1 more·Apr 8, 2026
Computing-in-Memory (CiM) is a promising paradigm to address the memory bottleneck constraining traditional systems. Most power-efficient CiM variants can directly perform Boolean operations in non-volatile memory arrays. Higher microarchitectural ac...
Coherence and entanglement dynamics in Shor's algorithm
Linlin Ye, Zhaoqi Wu, Shao-Ming Fei·Apr 8, 2026
Shor's algorithm outperforms its classical counterpart in efficient prime factorization. We explore the coherence and entanglement dynamics of the evolved states within Shor's algorithm, showing that the coherence in each step relies on the dimension...
Enhanced Precision in Entangled Quantum Clocks with Phase Estimation Algorithm
Won-Young Hwang·Apr 8, 2026
We present an enhanced entangled quantum clock protocol that incorporates a quantum phase estimation algorithm to directly estimate proper-time differences as an unknown phase. By employing highly entangled multi-clock states, the achievable uncertai...
Quantifying magic via quantum $(α,β)$ Jensen-Shannon divergence
Linmao Wang, Zhaoqi Wu·Apr 8, 2026
Magic states play an important role in fault-tolerant quantum computation, and so the quantification of magic for quantum states is of great significance. In this work, we propose two new magic quantifiers by introducing two versions of quantum $(α,β...
Deterministic linear-optical computing with symmetry-based qubits
David S. Simon, Christopher R. Schwarze, Anthony D. Manni +2 more·Apr 8, 2026
A particular type of linear optical multiport, the Grover four-port, has previously been shown to couple the spatial symmetry of a photon to its direction of travel. It is shown here that use of a nonstandard choice of qubit, based on symmetry, allow...
Database Reordering for Compact Grover Oracles with ESOP Minimization
Yusuke Kimura, Yutaka Takita·Apr 8, 2026
Grover's algorithm searches for data satisfying a desired condition in an unstructured database. This algorithm can search a space of size $N$ in $\sqrt{N}$ queries, thereby achieving a quadratic speedup. However, within the Grover oracle circuit tha...
Coherent feedback $H^\infty$ control of quantum linear systems
Guofeng Zhang, Ian R. Petersen·Apr 8, 2026
The purpose of this paper is to investigate the coherent feedback $H^\infty$ control problem for linear quantum systems. A key contribution is a simplified design methodology that guarantees closed-loop stability and a prescribed level of disturbance...
Discrete-variable assisted error correction of continuous-variable quantum information
Negin Razian, En-Jui Chang, Hoi-Kwan Lau·Apr 8, 2026
Robust continuous-variable (CV) quantum information processing requires correcting realistic errors in bosonic systems, but all existing schemes rely on auxiliary Gottesman-Kitaev-Preskill (GKP) states which the preparation and operation are demandin...
Quantum-Inspired Tensor Network Autoencoders for Anomaly Detection: A MERA-Based Approach
Emre Gurkanli, Michael Spannowsky·Apr 8, 2026
We investigate whether a multiscale tensor-network architecture can provide a useful inductive bias for reconstruction-based anomaly detection in collider jets. Jets are produced by a branching cascade, so their internal structure is naturally organi...
High-Dimensional Quantum Photonics: Roadmap
Mehul Malik, Micheal Kues, Takuya Ikuta +30 more·Apr 7, 2026
The field of high-dimensional quantum photonics involves the use of multimode photonic degrees-of-freedom such as the spatial, temporal, or spectral structure of light to encode multi-level quantum states. Recent years have seen rapid progress in the...