Quantum

Quantum has published 2260 Papers in 10 Volumes, as well as 87 Views in Quantum Views.

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…

Perspective

A new binary-search approach to optical quantum metrology

Mateusz Duda,

Quantum Views 9, 86 (2025).

Quantum metrology: Background Measurement is at the heart of science. The action of performing a measurement involves extracting information about a physical quantity. Every measurement resu…

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…

Paper

Quantum Enhanced Sensitivity through Many-Body Bloch Oscillations

Hassan Manshouri, Moslem Zarei, Mehdi Abdi, Sougato Bose, and Abolfazl Bayat,

Quantum 9, 1793 (2025).

We investigate the sensing capacity of non-equilibrium dynamics in quantum systems exhibiting Bloch oscillations. By focusing on the resource efficiency of the probe, quantified by quantum F…

Paper

Learning Feedback Mechanisms for Measurement-Based Variational Quantum State Preparation

Daniel Alcalde Puente and Matteo Rizzi,

Quantum 9, 1792 (2025).

This work introduces a self-learning protocol that incorporates measurement and feedback into variational quantum circuits for efficient quantum state preparation. By combining projective me…

Paper

Quantum PCPs: on Adaptivity, Multiple Provers and Reductions to Local Hamiltonians

Harry Buhrman, Jonas Helsen, and Jordi Weggemans,

Quantum 9, 1791 (2025).

We define a general formulation of quantum PCPs, which captures adaptivity and multiple unentangled provers, and give a detailed construction of the quantum reduction to a local Hamiltonian…

Paper

Unstructured Adiabatic Quantum Optimization: Optimality with Limitations

Arthur Braida, Shantanav Chakraborty, Alapan Chaudhuri, Joseph Cunningham, Rutvij Menavlikar, Leonardo Novo, and Jérémie Roland,

Quantum 9, 1790 (2025).

In the circuit model of quantum computing, amplitude amplification techniques can be used to find solutions to NP-hard problems defined on $n$-bits in time $\text{poly}(n) 2^{n/2}$. In this work…

Paper

Deep Circuit Compression for Quantum Dynamics via Tensor Networks

Joe Gibbs and Lukasz Cincio,

Quantum 9, 1789 (2025).

Dynamic quantum simulation is a leading application for achieving quantum advantage. However, high circuit depths remain a limiting factor on near-term quantum hardware. We present a compila…

Paper

Classical Simulation of High Temperature Quantum Ising Models

Elizabeth Crosson and Samuel Slezak,

Quantum 9, 1788 (2025).

We consider generalized quantum Ising models, including those which could describe disordered materials or quantum annealers, and we prove that for all temperatures above a system-size indep…

Paper

Gauge freedoms in unravelled quantum dynamics: When do different continuous measurements yield identical quantum trajectories?

Calum A. Brown, Katarzyna Macieszczak, and Robert L. Jack,

Quantum 9, 1787 (2025).

Quantum trajectories of a Markovian open quantum system arise from the back-action of measurements performed in the environment with which the system interacts. In this work, we consider cou…

Paper

Quantum state preparation via piecewise QSVT

Oliver O’Brien and Christoph Sünderhauf,

Quantum 9, 1786 (2025).

Efficient state preparation is essential for implementing efficient quantum algorithms. Whilst several techniques for low-cost state preparation exist, this work facilitates further classes…