Quantum

Paper

Quantum DeepONet: Neural operators accelerated by quantum computing

Pengpeng Xiao, Muqing Zheng, Anran Jiao, Xiu Yang, and Lu Lu,

Quantum 9, 1761 (2025).

In the realm of computational science and engineering, constructing models that reflect real-world phenomena requires solving partial differential equations (PDEs) with different conditions.…

Paper

How to avoid (apparent) signaling in Bell tests

Massimiliano Smania, Matthias Kleinmann, Adán Cabello, and Mohamed Bourennane,

Quantum 9, 1760 (2025).

Bell tests have become a powerful tool for quantifying security, randomness, entanglement, and many other properties, as well as for investigating fundamental physical limits. In all these c…

Paper

Pseudorandom unitaries are neither real nor sparse nor noise-robust

Tobias Haug, Kishor Bharti, and Dax Enshan Koh,

Quantum 9, 1759 (2025).

Pseudorandom quantum states (PRSs) and pseudorandom unitaries (PRUs) possess the dual nature of being efficiently constructible while appearing completely random to any efficient quantum alg…

Paper

Reinforcement Learning Based Quantum Circuit Optimization via ZX-Calculus

Jordi Riu, Jan Nogué, Gerard Vilaplana, Artur Garcia-Saez, and Marta P. Estarellas,

Quantum 9, 1758 (2025).

We propose a novel Reinforcement Learning (RL) method for optimizing quantum circuits using graph-theoretic simplification rules of ZX-diagrams. The agent, trained using the Proximal Policy…

Paper

Full Characterization of the Depth Overhead for Quantum Circuit Compilation with Arbitrary Qubit Connectivity Constraint

Pei Yuan and Shengyu Zhang,

Quantum 9, 1757 (2025).

In some physical implementations of quantum computers, 2-qubit operations can be applied only on certain pairs of qubits. Compilation of a quantum circuit into one compliant to such qubit co…

Paper

Renormalisation of Quantum Cellular Automata

Lorenzo Siro Trezzini, Alessandro Bisio, and Paolo Perinotti,

Quantum 9, 1756 (2025).

We study a coarse-graining procedure for quantum cellular automata on hypercubic lattices that consists in grouping neighboring cells into tiles and selecting a subspace within each tile. Th…

Paper

The State Preparation of Multivariate Normal Distributions using Tree Tensor Network

Hidetaka Manabe and Yuichi Sano,

Quantum 9, 1755 (2025).

The quantum state preparation of probability distributions is an important subroutine for many quantum algorithms. When embedding $D$-dimensional multivariate probability distributions by disc…

Paper

Protecting information in a parametrically driven hybrid quantum system

Siddharth Tiwary, Harsh Sharma, and Himadri Shekhar Dhar,

Quantum 9, 1754 (2025).

The transfer and storage of quantum information in a hybrid quantum system, consisting of an ensemble of atoms or spins interacting with a cavity, is adversely affected by the inhomogeneity…

Paper

Operational verification of the existence of a spacetime manifold

Nikola Paunkovic and Marko Vojinovic,

Quantum 9, 1753 (2025).

We argue that there exists an operational way to establish the observability of the notions of space and time. Specifically, we propose a theory-independent protocol for a gedanken-experimen…

Paper

Rise of conditionally clean ancillae for efficient quantum circuit constructions

Tanuj Khattar and Craig Gidney,

Quantum 9, 1752 (2025).

We introduce conditionally clean ancilla qubits, a new quantum resource, recently explored by [17], that bridges the gap between traditional clean and dirty ancillae. Like dirty ancillae, th…

Paper

Transfer and routing of Gaussian states through quantum complex networks with and without community structure

Markku Hahto, Johannes Nokkala, Guillermo García-Pérez, Sabrina Maniscalco, and Jyrki Piilo,

Quantum 9, 1751 (2025).

The goal in quantum state transfer is to avoid the need to physically transport carriers of quantum information. This is achieved by using a suitably engineered Hamiltonian that induces the…

Paper

Universal adjointation of isometry operations using conversion of quantum supermaps

Satoshi Yoshida, Akihito Soeda, and Mio Murao,

Quantum 9, 1750 (2025).

Identification of possible transformations of quantum objects including quantum states and quantum operations is indispensable in developing quantum algorithms. Universal transformations, de…

Paper

The measurement postulates of quantum mechanics are not redundant

Adrian Kent,

Quantum 9, 1749 (2025).

Masanes, Galley and Müller [39] argue that the measurement postulates of non-relativistic quantum mechanics follow from the structural postulates together with an assumption they call the "p…

Paper

Classical Benchmarks for Variational Quantum Eigensolver Simulations of the Hubbard Model

Antonios M. Alvertis, Abid Khan, Thomas Iadecola, Peter P. Orth, and Norm Tubman,

Quantum 9, 1748 (2025).

Simulating the Hubbard model is of great interest to a wide range of applications within condensed matter physics, however its solution on classical computers remains challenging in dimensio…

Paper

Block encoding bosons by signal processing

Christopher F. Kane, Siddharth Hariprakash, Neel S. Modi, Michael Kreshchuk, and Christian W Bauer,

Quantum 9, 1747 (2025).

Block Encoding (BE) is a crucial subroutine in many modern quantum algorithms, including those with near-optimal scaling for simulating quantum many-body systems, which often rely on Quantum…

Paper

Spontaneous symmetry emergence in a Hermitian system of coupled oscillators without symmetry

T. T. Sergeev, E. S. Andrianov, and A. A. Zyablovsky,

Quantum 9, 1746 (2025).

Spontaneous symmetry breaking in systems with symmetry is a cornerstone phenomenon accompanying second-order phase transitions. Here, we predict the opposite phenomenon, namely, spontaneous…

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