Papers
Scaling Laws for Hybrid Quantum Neural Networks: Depth, Width, and Quantum-Centric Diagnostics
Danil Vyskubov, Kirill Vyskubov, Nouhaila Innan +1 more·Apr 7, 2026
Hybrid quantum neural networks are increasingly explored for classification, yet it remains unclear how their performance and quantum behavior scale with circuit depth and qubit count. We present a controlled scaling study of hybrid quantum-classical...
Quantum Machine Learning for particle scattering entanglement classification
Hala Elhag, Yahui Chai·Apr 7, 2026
Entanglement is a key quantity for characterizing quantum correlations in particle scattering processes, but its direct evaluation is computationally demanding on quantum hardware. In this work, we investigate whether fermion density profiles, which ...
Distributed Quantum Property Testing with Communication Constraints
Mina Doosti, Ryan Sweke, Chirag Wadhwa·Apr 7, 2026
We introduce a framework for distributed quantum inference under communication constraints. In our model, $m$ distributed nodes each receive one copy of an unknown $d$-dimensional quantum state $ρ$, before communicating via a constrained one-way comm...
Adaptive Deformation of Color Code in Square Lattices with Defects
Tian-Hao Wei, Jia-Xuan Zhang, Jia-Ning Li +3 more·Apr 7, 2026
Quantum error correction is a crucial technology for fault tolerant quantum computing. On superconducting platforms, hardware defects in large scale quantum processors can disrupt the regular lattice structure of topological codes and impair their er...
Dynamical decoupling and quantum error correction with SU(d) symmetries
Colin Read, Eduardo Serrano-Ensástiga, John Martin·Apr 7, 2026
Dynamical decoupling is a long-established and effective way to suppress unwanted interactions in qubit systems, enabling advances in fields ranging from quantum metrology to quantum computing. For general qudit systems, however, comparable protocols...
Fault-Tolerant One-Shot Entanglement Generation with Constant-Sized Quantum Devices in the Plane
Dylan Harley, Robert Koenig·Apr 7, 2026
Consider a rectangular grid of qubits in 2D with single-qubit and nearest-neighbor two-qubit operations subject to local stochastic Pauli noise. At different length scales, this setup describes both a single quantum computing device with geometricall...
A plug-and-play superconducting quantum controller at millikelvin temperatures enables exceeding 99.9% average gate fidelity
Kuang Liu, Zhiyuan Wang, Xiaoliang He +12 more·Apr 7, 2026
The development of large-scale superconducting quantum computing requires efficient in-situ control methods that allow high-fidelity operations at millikelvin temperatures. Superconducting circuits based on Josephson junctions offer a promising solut...
Estimation of trace distance between two arbitrary quantum states
Sanchita Ghosh, Anumita Mukhopadhyay, Anindita Bera +2 more·Apr 7, 2026
When it comes to discriminating between two quantum states, trace distance is one of the well-known metrics used in quantum computation and quantum information theory. While there are several quantum algorithms for calculating the trace distance betw...
Resource Implications of Different Encodings for Quantum Computational Fluid Dynamics
Hans A. Kösel, Roland Ewert, Jan W. Delfs·Apr 7, 2026
For quantum algorithms for problems in which the task is to compute an entire field of values, like e.g. computational fluid dynamics (CFD), it is often proposed amplitude encoding w.r.t. multiple qubits; however, the efforts implied by it for initia...
Accelerating Quantum State Encoding with SIMD: Design, Implementation, and Benchmarking
Riza Alaudin Syah, Irwan Alnarus Kautsar, Gunawan Witjaksono +1 more·Apr 7, 2026
Efficient data encoding is the main factor affecting how fast hybrid quantum-classical algorithms run, but traditional simulators spend most of their time changing classical features into quantum rotations. This work introduces Hybriqu Encoder, a Rus...
Phase-Fidelity-Aware Truncated Quantum Fourier Transform for Scalable Phase Estimation on NISQ Hardware
Akoramurthy B, Surendiran. B·Apr 7, 2026
Quantum phase estimation~(QPE) is central to numerous quantum algorithms, yet its standard implementation demands an $\calO(m^{2})$-gate quantum Fourier transform~(QFT) on $m$ control qubits-a prohibitive overhead on near-term noisy intermediate-scal...
In-Situ Simultaneous Magic State Injection on Arbitrary CSS qLDPC Codes
Kun Liu, Shifan Xu, Tomas Jochym-O'Connor +3 more·Apr 6, 2026
Quantum low-density parity-check (qLDPC) codes can encode many logical qubits within a single code block at low physical qubit overhead, yet magic state injection into such codes remains largely underexplored. Existing state injection proposals for q...
Real-time Dynamics in 3D for up to 1000 Qubits with Neural Quantum States: Quenches and the Quantum Kibble--Zurek Mechanism
Vighnesh Dattatraya Naik, Zheng-Hang Sun, Markus Heyl·Apr 6, 2026
Exponential complexity of many-body wave functions limits accurate numerical simulations of real-time dynamics, especially beyond 1D, where rapid entanglement growth poses severe challenges. Neural Quantum States (NQS) have emerged as a powerful appr...
Cloning Encrypted Quantum States in Arbitrary Dimensions
Filip-Ioan Ceară·Apr 6, 2026
Recently, Yamaguchi and Kempf [Phys. Rev. Lett. 136:010801, arXiv:2501.02757] proved that encrypted qubits can be cloned. In this work, we generalize the encrypted cloning protocol and prove that it also applies to higher-order quantum systems. Given...
Toward Quantum Simulation of SU(2) Gauge Theory using Non-Compact Variables
Emanuele Mendicelli, Georg Bergner, Masanori Hanada·Apr 6, 2026
Simulating lattice gauge theories on quantum computers presents unique challenges that drive the development of novel theoretical frameworks. The orbifold lattice approach offers a scalable method for simulating SU($N$) gauge theories in arbitrary di...
Optimal, Qubit-Efficient Quantum Vehicle Routing via Colored-Permutations
Chinonso Onah, Kristel Michielsen·Apr 6, 2026
We formulate a global-position colored-permutation encoding for the capacitated vehicle routing problem. Each of the $K$ vehicles selects a disjoint partial permutation, and the sum of these $K$ color layers forms a full $n\times n$ permutation matri...
Efficient direct quantum state tomography using fan-out couplings
Jaekwon Chang, Guedong Park, Hyunseok Jeong +2 more·Apr 6, 2026
Characterizing quantum states is essential for validating quantum devices, yet conventional quantum state tomography becomes prohibitively expensive as system size grows. Direct tomography offers a distinct route by enabling selective access to indiv...
Digital-Analog Quantum Simulation and Computing: A Perspective on Past and Future Developments
Lucas Lamata·Apr 6, 2026
Quantum simulation and computing traditionally has been based on two main paradigms, namely, digital and analog. In the digital paradigm, usually single and two-qubit gates (where qubit is an acronym for quantum bit) are employed as building blocks f...
Noise tolerance via reinforcement in the quantum search problem
Marjan Homayouni-Sangari, Abolfazl Ramezanpour·Apr 5, 2026
We find that reinforcement exponentially reduces computation time of the quantum search problem from $\sqrt{D}$ to $\ln D$ in a $D$-dimensional system. Therefor, a reinforced quantum search is expected to exhibit an exponentially larger noise thresho...
Microstructural Topology as a Prescriptor for Quantum Coherence: Towards A Unified Framework for Decoherence in Superconducting Qubits
Vinayak P. Dravid, Akshay A. Murthy, Peter Lim +5 more·Apr 5, 2026
In superconducting quantum circuits, decoherence improvements are frequently obtained through process interventions that simultaneously modify surface chemistry, microstructural topology, and device geometry, leaving mechanistic attribution structura...