Quantum

Paper

Graphical Framework for Non-Gaussian Quantum States

Lina Vandré, Boxuan Jing, Yu Xiang, Otfried Gühne, and Qiongyi He,

Quantum 9, 1809 (2025).

We provide a graphical method to describe and analyze non-Gaussian quantum states using a hypergraph framework. These states are pivotal resources for quantum computing, communication, and m…

Paper

Critical spin models from holographic disorder

Dimitris Saraidaris and Alexander Jahn,

Quantum 9, 1808 (2025).

Discrete models of holographic dualities, typically modeled by tensor networks on hyperbolic tilings, produce quantum states with a characteristic quasiperiodic disorder not present in conti…

Paper

Certifying nonlocal properties of noisy quantum operations

Albert Rico, Moisés Bermejo Morán, Fereshte Shahbeigi, and Karol Życzkowski,

Quantum 9, 1807 (2025).

Certifying quantum properties from the probability distributions they induce is an important task for several purposes. While this framework has been largely explored and used for quantum st…

Paper

The Cramér-Rao approach and global quantum estimation of bosonic states

Masahito Hayashi and Yingkai Ouyang,

Quantum 9, 1806 (2025).

Quantum state estimation is a fundamental task in quantum information theory, where one estimates real parameters continuously embedded in a family of quantum states. In the theory of quantu…

Paper

Dictionary-based Block Encoding of Sparse Matrices with Low Subnormalization and Circuit Depth

Chunlin Yang, Zexian Li, Hongmei Yao, Zhaobing Fan, Guofeng Zhang, and Jianshe Liu,

Quantum 9, 1805 (2025).

Block encoding severs as an important data input model in quantum algorithms, enabling quantum computers to simulate non-unitary operators effectively. In this paper, we propose an efficient…

Paper

Bounds on Autonomous Quantum Error Correction

Oles Shtanko, Yu-Jie Liu, Simon Lieu, Alexey V. Gorshkov, and Victor V. Albert,

Quantum 9, 1804 (2025).

Autonomous quantum memories are a way to passively protect quantum information using engineered dissipation that creates an “always-on'' decoder. We analyze Markovian autonomous decoders tha…

Paper

Neural Projected Quantum Dynamics: a systematic study

Luca Gravina, Vincenzo Savona, and Filippo Vicentini,

Quantum 9, 1803 (2025).

We investigate the challenge of classical simulation of unitary quantum dynamics with variational Monte Carlo approaches, addressing the instabilities and high computational demands of exist…

Paper

Symmetry verification for noisy quantum simulations of non-Abelian lattice gauge theories

Edoardo Ballini, Julius Mildenberger, Matteo M. Wauters, and Philipp Hauke,

Quantum 9, 1802 (2025).

Non-Abelian gauge theories underlie our understanding of fundamental forces of modern physics. Simulating them on quantum hardware is an outstanding challenge in the rapidly evolving field o…

Paper

Probing quantum complexity via universal saturation of stabilizer entropies

Tobias Haug, Leandro Aolita, and M.S. Kim,

Quantum 9, 1801 (2025).

Nonstabilizerness or `magic' is a key resource for quantum computing and a necessary condition for quantum advantage. Non-Clifford operations turn stabilizer states into resourceful states,…

Paper

Averaging gate approximation error and performance of Unitary Coupled Cluster ansatz in Pre-FTQC Era

Kohdai Kuroiwa and Yuya O. Nakagawa,

Quantum 9, 1800 (2025).

Fault-tolerant quantum computation (FTQC) is essential to implement quantum algorithms in a noise-resilient way, and thus to enjoy advantages of quantum computers even with presence of noise…

Paper

Quick design of feasible tensor networks for constrained combinatorial optimization

Hyakka Nakada, Kotaro Tanahashi, and Shu Tanaka,

Quantum 9, 1799 (2025).

Quantum computers are expected to enable fast solving of large-scale combinatorial optimization problems. However, their limitations in fidelity and the number of qubits prevent them from ha…

Paper

Estimation of Quantum Fisher Information via Stein’s Identity in Variational Quantum Algorithms

Mourad Halla,

Quantum 9, 1798 (2025).

The Quantum Fisher Information Matrix (QFIM) plays a crucial role in quantum optimization algorithms such as Variational Quantum Imaginary Time Evolution and Quantum Natural Gradient Descent…

Paper

Entanglement and Stabilizer entropies of random bipartite pure quantum states

Daniele Iannotti, Gianluca Esposito, Lorenzo Campos Venuti, and Alioscia Hamma,

Quantum 9, 1797 (2025).

The interplay between non-stabilizerness and entanglement in random states is a very rich arena of study for the understanding of quantum advantage and complexity. In this work, we tackle th…

Paper

End-to-end switchless architecture for fault-tolerant photonic quantum computing

Paul Renault, Patrick Yard, Raphael C. Pooser, Miller Eaton, and Hussain Asim Zaidi,

Quantum 9, 1796 (2025).

Photonics represents one of the most promising approaches to large-scale quantum computation with millions of qubits and billions of gates, owing to the potential for room-temperature operat…

Paper

Transforming graph states via Bell state measurements

Matthias C. Löbl, Love A. Pettersson, Stefano Paesani, and Anders S. Sørensen,

Quantum 9, 1795 (2025).

Graph states are key resources for measurement-based quantum computing, which is particularly promising for photonic systems. Fusions are probabilistic Bell state measurements, measuring pai…

Paper

Field theory for monitored Brownian SYK clusters

Anastasiia Tiutiakina, Hugo Lóio, Guido Giachetti, Jacopo De Nardis, and Andrea De Luca,

Quantum 9, 1794 (2025).

We consider the time evolution of multiple clusters of Brownian Sachdev-Ye-Kitaev (SYK), i.e. systems of N Majorana fermions with a noisy interaction term. In addition to the unitary evoluti…

Category: Paper