Papers
Information-Geometric Quantum Process Tomography of Single Qubit Systems
T. Koide, A. van de Venn·Mar 24, 2026
We establish an exact information-geometric inequality that remains valid regardless of the underlying dynamics, encompassing both Markovian and non-Markovian evolutions within the mixed-state domain. This inequality can be viewed as an extension of ...
QuickQudits: A Framework for Efficient Simulation of Noisy Qudit Clifford Circuits via an Extended Stabilizer Tableau Formalism
Nina Brandl, Mykyta Cherniak, Johannes Kofler +1 more·Mar 24, 2026
We present a comprehensive and self-contained framework for the efficient classical simulation of Clifford circuits acting on $d$-dimensional qudits, including realistic Pauli/Weyl noise via stochastic simulation. Our approach uses the stabilizer tab...
Tensor network influence functionals for open quantum systems with general Gaussian bosonic baths
Valentin Link·Mar 24, 2026
Dynamics of open quantum systems with structured reservoirs can often be simulated efficiently with tensor network influence functionals. The standard variants of the time-evolving matrix product operator (TEMPO) method are applicable when the system...
Quantum simulation of Motzkin spin chain with Rydberg atoms
Kaustav Mukherjee, Hatem Barghathi, Adrian Del Maestro +1 more·Mar 24, 2026
Motzkin spin chain is a well-known mathematical model with connections to symmetry-protected topological phases, such as the Haldane phase, as well as to concepts in the AdS/CFT correspondence. They exhibit highly entangled ground states that violate...
Two-parameter Family-Vicsek scaling in a dissipative XXZ spin chain
Cătălin Paşcu Moca, Doru Sticlet, Tamás Vicsek +1 more·Mar 24, 2026
Family-Vicsek (FV) scaling provides an understanding for the growth and finite-size saturation of fluctuations in classical systems. Here, we extend the FV roughness to transferred segment magnetization after quantum quenches in a dissipative XXZ spi...
Bell Experiments Revisited: A Numerical Approach Based on De Broglie--Bohm Theory
Tim Dartois, Signe Seidelin, Aurélien Drezet·Mar 24, 2026
We present a complete and rigorous model of an EPR--Bell-type experiment within the framework of the de Broglie--Bohm theory. The purpose of this work is to show explicitly how a deterministic hidden-variable theory can reproduce all quantum-mechanic...
STAR-Magic Mutation: Even More Efficient Analog Rotation Gates for Early Fault-Tolerant Quantum Computer
Riki Toshio, Shota Kanasugi, Jun Fujisaki +3 more·Mar 24, 2026
We introduce STAR-magic mutation, an efficient protocol for implementing logical rotation gates on early fault-tolerant quantum computers. This protocol judiciously combines two of the latest state preparation protocols: transversal multi-rotation pr...
Encoded Quantum Signal Processing for Heisenberg-Limited Metrology
Carlos Ortiz Marrero, Rui Jie Tang, Nathan Wiebe·Mar 24, 2026
Entangled quantum probes can achieve Heisenberg-limited measurement precision, but this advantage is typically destroyed by noise. We address this issue by introducing a framework that we call encoded quantum signal processing, which unifies quantum ...
Enabling Chemically Accurate Quantum Phase Estimation in the Early Fault-Tolerant Regime
Shota Kanasugi, Riki Toshio, Kazunori Maruyama +1 more·Mar 24, 2026
Quantum simulation of molecular electronic structure is one of the most promising applications of quantum computing. However, achieving chemically accurate predictions for strongly correlated systems requires quantum phase estimation (QPE) on fault-t...
Charging efficiency bursts in a quantum battery with cyclic indefinite causal order
Po-Rong Lai, Hsien-Chao Jan, Jhen-Dong Lin +1 more·Mar 24, 2026
Enhancement of quantum battery performance is a popular subject in quantum thermodynamics. An interesting phenomenon is the quick charging effect [Phys. Rev. Res. 6, 023136 (2024)], which has been explored by utilizing a quantum interferometric techn...
Optimal filtering for a giant cavity in waveguide QED systems
Guangpu Wu, Shibei Xue, Yuting Zhu +2 more·Mar 24, 2026
In waveguide quantum electrodynamics (QED) systems, a giant cavity can be engineered to interact with quantum fields by multiple distant coupling points so that its non-Markovian dynamics are quite different from traditional quantum optical cavity sy...
Robust Atom Interferometry with Double Bragg Diffraction
Rui Li·Mar 23, 2026
This thesis develops a general theoretical and numerical framework for achieving high-contrast atom interferometry based on double Bragg diffraction (DBD). While DBD offers intrinsic symmetry, reduced sensitivity to internal-state systematics, and su...
On the stability to noise of fermion-to-qubit mappings
Guillermo González-García, Filippo Maria Gambetta, Raul A. Santos·Mar 23, 2026
Quantum simulations before fault tolerance suffer from the intrinsic noise present in quantum computers. In this regime, extracting meaningful results greatly benefits from stability against that noise. This stability, defined as an error in observab...
Accurate ground state energy estimation with noise and imperfect state preparation
Alicja Dutkiewicz, Thomas E. O'Brien, Stefano Polla·Mar 23, 2026
We introduce a classical estimator for the post-processing of quantum phase estimation data generated either by quantum-Fourier-transform-based or quantum-signal-processing-based methods. We focus on the estimation of a single target phase promised t...
Implemetation of a shooting technique for quantum optimal control on spin qudits
Paul-Louis Etienney, Paul-Antoine Hervieux, Denis Jankovic +3 more·Mar 23, 2026
High-fidelity control of quantum systems is essential for scalable quantum technologies. We introduce a shooting-based quantum optimal control algorithm for systems of finite-dimensional Hilbert spaces, and demonstrate its performances through numeri...
Efficient Gaussian Simulations of Fermionic Open Quantum Systems
Yinan Fang, Hyesung Choi, Minchul Lee +1 more·Mar 23, 2026
We review existing classical simulation methods for performing fermionic Gaussian operations and develop new methods to address the gap by adhering to the fundamental theoretical framework established by Bravyi [Quantum Info. Comput. 5, 216 (2005)] f...
Gate-based Readout and Cooling of Neutral Atoms
Richard Bing-Shiun Tsai, Lewis R. B. Picard, Xiangkai Sun +3 more·Mar 23, 2026
Neutral atom arrays have seen tremendous progress in quantum simulation, quantum metrology, and fault-tolerant quantum computing. However, hardware constraints such as atom loss and heating remain significant challenges. In this work, we introduce a ...
Neural network approach to mitigating intra-gate crosstalk in superconducting CZ gates
Yiming Yu, Yexiong Zeng, Ye-Hong Chen +2 more·Mar 23, 2026
The potential of quantum computing is fundamentally constrained by the inherent susceptibility of qubits to noise and crosstalk, particularly during multi-qubit gate operations. Existing strategies, such as hardware isolation and dynamical decoupling...
Single-Trajectory Gibbs Sampling for Non-Commuting Observables
Hongrui Chen, Jiaqing Jiang, Bowen Li +1 more·Mar 23, 2026
Estimating thermal expectation values of quantum many-body systems is a central challenge in physics, chemistry, and materials science. Standard quantum Gibbs sampling protocols address this task by preparing the Gibbs state from scratch after every ...
The Average Relative Entropy and Transpilation Depth determines the noise robustness in Variational Quantum Classifiers
Aakash Ravindra Shinde, Arianne Meijer - van de Griend, Jukka K. Nurminen·Mar 22, 2026
Variational Quantum Algorithms (VQAs) have been extensively researched for applications in Quantum Machine Learning (QML), Optimization, and Molecular simulations. Although designed for Noisy Intermediate-Scale Quantum (NISQ) devices, VQAs are predom...