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...
Mikel Garcia-de-Andoin, Thorge Müller, Gonzalo Camacho • Published: 2025-11-14
Digital-analog is a quantum computational paradigm that employs the natural interaction Hamiltonian of a system as the entangling resource, combined with single qubit gates, to implement universal quantum operations. As in the case of its digital gate-based counterpart, designing digital-analog circuits that employ optimal quantum resources often requires an exceedingly large classical computation...
Fabian Wiesner, Anna Pappa • Published: 2026-03-10
Delegated quantum computation enables a client with limited quantum capabilities to outsource computations to a more powerful quantum server while preserving correctness and privacy. Verification is crucial in this setting to ensure that the untrusted quantum server performs the computation honestly and returns correct results. A common verification method is the quantum cut-and-choose technique. ...
Xi Lu, Bojko N. Bakalov, Yuan Liu • Published: 2026-03-10
We introduce a framework for simulating hybrid oscillator-qubit quantum processors on qubit-only systems through position encoding. By encoding continuous-variable position and momentum wave functions into qubit amplitudes, our method efficiently simulates all Gaussian and conditional Gaussian operations -- encompassing the phase-space instruction set (beam splitter, single-qubit rotation, conditi...
Prince Frederick Kwao, Srivathsan Poyyapakkam Sundar, Brajesh Gupt, Ayush Asthana • Published: 2025-03-12
Solving challenging problems in quantum chemistry is one of the most promising applications of quantum computers. Within the quantum algorithms proposed for problems in excited state quantum chemistry, subspace-based quantum algorithms, including quantum subspace expansion (QSE), quantum equation of motion (qEOM) and quantum self-consistent equation-of-motion (q-sc-EOM), are promising for pre-faul...
Arturo Acuaviva, David Aguirre, Rubén Peña, Mikel Sanz • Published: 2024-07-15
The technological development of increasingly larger quantum processors on different quantum platforms raises the problem of how to fairly compare their performance, known as quantum benchmarking of quantum processors. This is a challenge that computer scientists have already faced when comparing classical processors, leading to the development of various mathematical tools to address it, but also...