Papers
Probing topological edge states in a molecular synthetic dimension
Adarsh P. Raghuram, Francesca M. Blondell, Jonathan M. Mortlock +7 more·Apr 1, 2026
Engineering synthetic dimensions, where the physics of additional spatial dimensions is simulated within the internal states of a quantum system, allows the realisation of phenomena not otherwise accessible in experiments. Ultracold ground-state pola...
Engineering a Phase-Noise-Based Quantum Random Number Generator for Real-Time Secure Applications: Design, Validation, and Scalability
Anurag K. S. V., Shubham Chouhan, K. Srinivasan +2 more·Apr 1, 2026
Random Number Generators (RNGs) are crucial for applications ranging from cryptography to simulations. Depending on the source of randomness, RNGs are classified into Pseudo-Random Number Generators (PRNGs), True Random Number Generators (TRNGs), and...
Quantum machine learning for the quantum lattice Boltzmann method: Trainability of variational quantum circuits for the nonlinear collision operator across multiple time steps
Antonio David Bastida Zamora, Ljubomir Budinski, Pierre Sagaut +1 more·Apr 1, 2026
This study investigates the application of quantum machine learning (QML) to approximate the nonlinear component of the collision operator within the quantum lattice Boltzmann method (QLBM). To achieve this, we train a variational quantum circuit (VQ...
Quantum algorithms for the fractional Poisson equation via rational approximation
Yin Yang, Yue Yu, Long Zhang +1 more·Apr 1, 2026
This paper presents a quantum algorithm for solving the fractional Poisson equation \((-Δ)^s u = f\) with \(s \in (0,1)\) on bounded domains. The proposed approach combines rational approximation techniques with quantum linear system solvers to achie...
Scattering phase shift in quantum mechanics on quantum computers: non-Hermitian systems and imaginary-time simulations
Peng Guo, Paul LeVan, Frank X. Lee +1 more·Mar 31, 2026
To overcome the fast oscillatory behavior of correlation functions for extracting scattering phase shift in real-time quantum simulations encountered in Ref.\cite{Guo:2026qkx}, we propose and test two solutions in the present work. One is to simulate...
Dynamics of entanglement entropy for a locally monitored lattice gauge theory
Nisa Ara, Arpan Bhattacharyya, Nilachal Chakrabarti +2 more·Mar 31, 2026
The $1+1$ dimensional $Z_2$ gauge theory is the simplest model that allows for quantum computation or quantum simulation to probe the fundamental aspects of a gauge theory coupled with dynamical fermions. To reliably benchmark such a system, it is cr...
Trotter Scars: Trotter Error Suppression in Quantum Simulation
Bozhen Zhou, Qi Zhao, Pan Zhang·Mar 31, 2026
Recent studies have shown that Trotter errors are highly initial-state dependent and that standard upper bounds often substantially overestimate them. However, the mechanism underlying anomalously small Trotter errors and a systematic route to identi...
The Manipulate-and-Observe Attack on Quantum Key Distribution
William Tighe, George Brumpton, Mark Carney +1 more·Mar 31, 2026
Quantum key distribution is often regarded as an unconditionally secure method to exchange a secret key by harnessing fundamental aspects of quantum mechanics. Despite the robustness of key exchange, classical post-processing reveals vulnerabilities ...
Multipartite controlled-NOT gates using molecules and Rydberg atoms
Yi-Han Bai, Yue Wei, Chi Zhang +2 more·Mar 31, 2026
We propose high-fidelity controlled-NOT (CNOT) gates in a hybrid system of polar molecules and Rydberg atoms based on the unconventional Rydberg pumping mechanism. By combining the rich internal structure of polar molecules with the strong dipole-dip...
On the Entanglement Entropy Distribution of a Hybrid Quantum Circuit
Jeonghyeok Park, Hyukjoon Kwon, Hyeonseok Jeong·Mar 31, 2026
We investigate the distribution of entanglement entropy in hybrid quantum circuits consisting of random unitary gates and local measurements applied at a finite rate. We demonstrate that higher moments of the entanglement entropy distribution, such a...
Calculating the quantum Fisher information via the truncated Wigner method
Thakur G. M. Hiranandani, Joseph J. Hope, Simon A. Haine·Mar 31, 2026
In this work, we propose new methods of parameter estimation using stochastic sampling quantum phase-space simulations. We show that it is possible to compute the quantum Fisher information (QFI) from semiclassical stochastic samples using the Trunca...
Ether of Orbifolds
Henry Lamm·Mar 31, 2026
The orbifold lattice has been proposed as a route to practical quantum simulation of Yang--Mills theory, with claims of exponential speedup over all known approaches. Through analytical derivations, Monte Carlo simulation, and explicit circuit constr...
Effects of measurements on entanglement dynamics for $1+1$D $\mathbb Z_2$ lattice gauge theory
Nilachal Chakrabarti, Nisa Ara, Neha Nirbhan +2 more·Mar 30, 2026
The $1+1$ dimensional $\mathbb Z_2$ gauge theory is the simplest model that allows for quantum simulation to probe the fundamental aspects of a gauge theory coupled with dynamical fermions. To reliably benchmark such a system, it is crucial to unders...
Color code off-the-hook: avoiding hook errors with a single auxiliary per plaquette
Gilad Kishony, Austin Fowler·Mar 30, 2026
Syndrome extraction in the planar color code is complicated by high weight stabilizers and hook errors that can reduce the circuit-level distance. With a single auxiliary qubit per plaquette, any spatially uniform circuit halves the circuit-level dis...
Hunting for quantum advantage in electronic structure calculations is a highly non-trivial task
Örs Legeza, Andor Menczer, Miklós Antal Werner +7 more·Mar 30, 2026
In light of major developments over the past decades in both quantum computing and simulations on classical hardware, it is a serious challenge to identify a real-world problem where quantum advantage is expected to appear. In quantum chemistry, elec...
Quantum Riemannian Hamiltonian Descent
Yoshihiko Abe, Ryo Nagai·Mar 30, 2026
We propose Quantum Riemannian Hamiltonian Descent (QRHD), a quantum algorithm for continuous optimization on Riemannian manifolds that extends Quantum Hamiltonian Descent (QHD) by incorporating geometric structure of the parameter space via a positio...
Lindbladian Simulation with Commutator Bounds
Xinzhao Wang, Shuo Zhou, Xiaoyang Wang +3 more·Mar 30, 2026
Trotter decomposition provides a simple approach to simulating open quantum systems by decomposing the Lindbladian into a sum of individual terms. While it is established that Trotter errors in Hamiltonian simulation depend on nested commutators of t...
Average Equilibration Time for Gaussian Unitary Ensemble Hamiltonians
Emanuel Schwarzhans, Alessandro Candeloro, Felix C. Binder +2 more·Mar 30, 2026
Understanding equilibration times in closed quantum systems is essential for characterising their approach to equilibrium. Chaotic many-body systems are paradigmatic in this context: they are expected to thermalise according to the eigenstate thermal...
The Power of Power-of-SWAP: Postselected Quantum Computation with the Exchange Interaction
Jędrzej Burkat, Sergii Strelchuk, Michał Studziński·Mar 30, 2026
We introduce Exchange Quantum Polynomial Time (XQP) circuits, which comprise quantum computation using only computational basis SPAM and the isotropic Heisenberg exchange interaction. Structurally, this sub-universal model captures decoherence-free s...
Tunable Nonlocal ZZ Interaction for Remote Controlled-Z Gates Between Distributed Fixed-Frequency Qubits
Benzheng Yuan, Chaojie Zhang, Haoran He +9 more·Mar 30, 2026
Fault-tolerant quantum computing requires large-scale superconducting processors, yet monolithic architectures face increasing constraints from wiring density, crosstalk, and fabrication yield. Modular superconducting platforms offer a scalable alter...