Baptiste Claudon, Sergi Ramos-Calderer, Jean-Philip Piquemal • Published: 2026-03-09
Quantum algorithms present a quadratically improved complexity over classical ones for certain sampling tasks. For instance, the Quantum Amplitude Estimation (QAE) algorithm promises to speedup the estimation of the mean of certain functions, given access to the quantum state corresponding to the probability distribution to be sampled from. Classically, samples are often obtained by running steps ...
Yasuaki Nakayama, Yuki Takeuchi, Seiseki Akibue • Published: 2026-03-12
The computational universality with an elementary gate set $\{H,CCZ\}$ can be transformed to the strict universality by using a maximally imaginary state $|+i\rangle$ and some non-imaginary ancillary qubits. From the viewpoint of operational resource theory, it would be intriguing to elucidate a resource for the universality transformation. In this paper, we explore a necessary and sufficient cond...
Kazuya Shinjo, Kazuhiro Seki, Tomonori Shirakawa, Rong-Yang Sun, Seiji Yunoki • Published: 2024-03-25
In periodically driven (Floquet) systems, evolution typically results in an infinite-temperature thermal state due to continuous energy absorption over time. However, before reaching thermal equilibrium, such systems may transiently pass through a meta-stable state known as a prethermal state. This prethermal state can exhibit phenomena not commonly observed in equilibrium, such as discrete time c...
Lachlan Oberg, Paul Corry, Moji Ghadimi, Ashish Bhaskar • Published: 2026-03-12
Transport engineering has significant potential to benefit from quantum computing. The rise of intelligent transport systems, autonomous vehicles, and the Internet of Things has created an unprecedented demand for efficient information processing and computational optimisation. Accordingly, transport engineers and scientists have explored the ever-improving capabilities of quantum computers in an ...
Keisuke Murota, Synge Todo, Suguru Endo • Published: 2026-03-12
Simulating real-time dynamics under a Hamiltonian is a central goal of quantum information science. While numerous Hamiltonian-simulation quantum algorithms have been proposed, the effects of physical noise have rarely been incorporated into performance analysis, despite the non-negligible noise levels in quantum devices. In this work, we analyze noisy Hamiltonian simulation with quantum error mit...
Jim Furches, Timothy J. Stavenger, Carlos Ortiz Marrero • Published: 2026-03-11
Hybrid quantum computing systems that combine discrete-variable qubits with continuous-variable qumodes offer promising advantages for quantum simulation, error correction, and sensing applications. However, existing quantum software frameworks lack native support for expressing and manipulating hybrid circuits, forcing developers to work with fragmented toolchains or rely on simulation-coupled re...
William E. Salazar, Omar Calderón-Losada, John H. Reina • Published: 2023-10-31
Beam splitters (BSs) and optical parametric amplifiers (OPAs) can be described using Lie groups $SU(2)$ and $SU(1,1)$. Here, we show that the dynamical trajectories of these devices are connected via a Wick rotation on their respective group manifolds. This yields an exact amplitude-level duality between BSs of transmittance $η$ and OPAs of gain $g=1/η$. This geometric correspondence admits a comp...
Govind Krishna, Rohan Yadgirkar, Balakrishnan Krishnakumar, Andrea Cataldo, Ze-Sheng Xu, Johannes W. N. Los, Val Zwiller, Jun Gao, Ali W. Elshaari • Published: 2026-03-11
Quantum fluctuation relations provide a microscopic formulation of thermodynamics beyond equilibrium, but experimentally accessing many-body quantum work statistics remains an outstanding challenge. The quantum piston constitutes a canonical model of boundary-driven nonequilibrium dynamics, where finite-time deformation of a confining potential generates non-adiabatic transitions, dissipation and ...
Juan M. Murillo, Ignacio García Rodríguez de Guzmán, Enrique Moguel, Javier Romero-Álvarez, Jaime Alvarado-Valiente, Álvaro M. Aparicio-Morales, Jose Garcia-Alonso, Ana Díaz Muñoz, Eduardo Fernández-Medina, Francisco Chicano, Carlos Canal, José Daniel Viqueira, Sebastián Villarroya, Eduardo Gutiérrez, Adrián Romero-Flores, Alfonso E. Márquez-Chamorro, Antonio Ruiz-Cortes, Cyrille YetuYetu Kesiku, Pedro Sánchez, Diego Alonso Cáceres, Lidia Sánchez-González, Fernando Plou • Published: 2026-03-11
The first edition of the QuantumX track, held within the XXIX Jornadas de Ingeniería del Software y Bases de Datos (JISBD 2025), brought together leading Spanish research groups working at the intersection of Quantum Computing and Software Engineering. The event served as a pioneering forum to explore how principles of software quality, governance, testing, orchestration, and abstraction can be ad...
Fariba Hosseinynejad, Pavithran Iyer, Guillaume Dauphinais, David L. Feder • Published: 2025-11-05
Physical Gottesman-Kitaev-Preskill (GKP) states are inherently noisy as ideal ones would require infinite energy. While this is typically considered as a deficiency to be actively corrected, this work demonstrates that imperfect GKP stabilizer states can be leveraged in order to apply non-Clifford gates using only linear optical elements. In particular, Gaussian operations on normalizable GKP stat...