Quantum

Paper

Controlling measurement-induced phase transitions with tunable detector coupling

Ritu Nehra, Alessandro Romito, and Dganit Meidan,

Quantum 9, 1697 (2025).

We study the evolution of a quantum many-body system driven by two competing measurements, which induces a topological entanglement transition between two distinct area law phases. We employ…

Paper

A Note on Quantum-Secure PRPs

Mark Zhandry,

Quantum 9, 1696 (2025).

We show how to construct pseudorandom permutations (PRPs) that remain secure even if the adversary can query the permutation, both in the forward and reverse directions, on a quantum superpo…

Paper

What can unitary sequences tell us about multi-time physics?

Gregory A. L. White, Felix A. Pollock, Lloyd C. L. Hollenberg, Charles D. Hill, and Kavan Modi,

Quantum 9, 1695 (2025).

Multi-time quantum processes are endowed with the same richness as multipartite states, including temporal entanglement and exotic causal structures. However, experimentally probing these ri…

Paper

Resource-Optimized Grouping Shadow for Efficient Energy Estimation

Min Li, Mao Lin, and Matthew J. S. Beach,

Quantum 9, 1694 (2025).

The accurate and efficient energy estimation of quantum Hamiltonians consisting of Pauli observables is an essential task in modern quantum computing. We introduce a Resource-Optimized Group…

Paper

Spatially-Coupled QLDPC Codes

Siyi Yang and Robert Calderbank,

Quantum 9, 1693 (2025).

Spatially-coupled (SC) codes is a class of convolutional LDPC codes that has been well investigated in classical coding theory thanks to their high performance and compatibility with low-lat…

Paper

Charge and Spin Sharpening Transitions on Dynamical Quantum Trees

Xiaozhou Feng, Nadezhda Fishchenko, Sarang Gopalakrishnan, and Matteo Ippoliti,

Quantum 9, 1692 (2025).

The dynamics of monitored systems can exhibit a measurement-induced phase transition (MIPT) between entangling and disentangling phases, tuned by the measurement rate. When the dynamics obey…

Paper

Noise-tolerant public-key quantum money from a classical oracle

Peter Yuen,

Quantum 9, 1691 (2025).

Quantum money is the task of verifying the validity of banknotes while ensuring that they cannot be counterfeited. Public-key quantum money allows anyone to perform verification, while the p…

Paper

Nonlinearity of the Fidelity in Open Qudit Systems: Gate and Noise Dependence in High-dimensional Quantum Computing

Jean-Gabriel Hartmann, Denis Janković, Rémi Pasquier, Mario Ruben, and Paul-Antoine Hervieux,

Quantum 9, 1690 (2025).

High-dimensional quantum computing has generated significant interest due to its potential to address scalability and error correction challenges faced by traditional qubit-based systems. Th…

Paper

Learning in Quantum Common-Interest Games and the Separability Problem

Wayne Lin, Georgios Piliouras, Ryann Sim, and Antonios Varvitsiotis,

Quantum 9, 1689 (2025).

Learning in games has emerged as a powerful tool for machine learning with numerous applications. Quantum games model interactions between strategic players who have access to quantum resour…

Paper

Quantum Merlin-Arthur proof systems for synthesizing quantum states

Hugo Delavenne, François Le Gall, Yupan Liu, and Masayuki Miyamoto,

Quantum 9, 1688 (2025).

Complexity theory typically focuses on the difficulty of solving computational problems using classical inputs and outputs, even with a quantum computer. In the quantum world, it is natural…

Paper

Quantum Edge Detection

Santiago Llorens, Walther González, Gael Sentís, John Calsamiglia, Ramon Muñoz-Tapia, and Emili Bagan,

Quantum 9, 1687 (2025).

This paper introduces quantum edge detection, aimed at locating boundaries of quantum domains where all particles share the same pure state. Focusing on the 1D scenario of a string of partic…

Paper

Which features of quantum physics are not fundamentally quantum but are due to indeterminism?

Flavio Del Santo and Nicolas Gisin,

Quantum 9, 1686 (2025).

What is fundamentally quantum? We argue that most of the features, problems, and paradoxes – such as the measurement problem, the Wigner's friend paradox and its proposed solutions, single p…

Paper

Free fermions under adaptive quantum dynamics

Vikram Ravindranath, Zhi-Cheng Yang, and Xiao Chen,

Quantum 9, 1685 (2025).

We study free fermion systems under adaptive quantum dynamics consisting of unitary gates and projective measurements followed by corrective unitary operations. We further introduce a classi…

Paper

Impact of decoherence on the fidelity of quantum gates leaving the computational subspace

Tahereh Abad, Yoni Schattner, Anton Frisk Kockum, and Göran Johansson,

Quantum 9, 1684 (2025).

The fidelity of quantum operations is often limited by incoherent errors, which typically can be modeled by fundamental Markovian noise processes such as amplitude damping and dephasing. In…

Paper

Ring-exchange physics in a chain of three-level ions

Sourav Biswas, E. Rico, and Tobias Grass,

Quantum 9, 1683 (2025).

In the presence of ring exchange interactions, bosons in a ladder-like lattice may form the bosonic analogon of a correlated metal, known as the d-wave Bose liquid (DBL). In this paper, we s…

Paper

Early Fault-Tolerant Quantum Algorithms in Practice: Application to Ground-State Energy Estimation

Oriel Kiss, Utkarsh Azad, Borja Requena, Alessandro Roggero, David Wakeham, and Juan Miguel Arrazola,

Quantum 9, 1682 (2025).

We investigate the feasibility of early fault-tolerant quantum algorithms focusing on ground-state energy estimation problems. In particular, we examine the computation of the cumulative dis…

Category: Paper