M. P. Tonne, Kh. P. Gnatenko • Published: 2026-01-15
The entanglement distance of evolutionary quantum states of a two-spin system with the XXZ model has been studied. The analysis has been conducted both analytically and using quantum computing. An analytical dependence of the entanglement distance on the values of the model coupling constants and the parameters of the initial states has been obtained. The speed of evolution of a two-spin system ha...
Benoît Vermersch, Oscar Gravier, Nathan Miscopein, Julia Guignon, Carlos Ramos Marimón, Jonathan Durandau, Matthieu Dartiailh, Tristan Meunier, Valentin Savin • Published: 2026-01-15
We introduce SpinPulse, an open-source python package for simulating spin qubit-based quantum computers at the pulse-level. SpinPulse models the specific physics of spin qubits, particularly through the inclusion of classical non-Markovian noise. This enables realistic simulations of native gates and quantum circuits, in order to support hardware development. In SpinPulse, a quantum circuit is fir...
Darrell Teegarden, Allison Casey, F. Gino Serpa, Patrick Becker, Asmita Brahme, Saanvi Kataria, Paul Lopata • Published: 2026-01-15
Quantum Computing (QC) has evolved from a few custom quantum computers, which were only accessible to their creators, to an array of commercial quantum computers that can be accessed on the cloud by anyone. Accessing these cloud quantum computers requires a complex chain of tools that facilitate connecting, programming, simulating algorithms, estimating resources, submitting quantum computing jobs...
Gunhee Cho • Published: 2026-01-14
This book gives a geometry-first, hardware-aware route through quantum-information workflows, with one goal: connect states, circuits, and measurement to deterministic classical pipelines that make hybrid quantum systems run. Part 1 develops the backbone (essential linear algebra, the Bloch-sphere viewpoint, differential-geometric intuition, and quantum Fisher information geometry) so evolution ca...
Kyrylo Simonov, Marcello Caleffi, Jessica Illiano, Jacquiline Romero, Angela Sara Cacciapuoti • Published: 2023-11-22
Superposed orders of quantum channels have already been proved - both theoretically and experimentally - to enable unparalleled opportunities in the quantum communication domain. As a matter of fact, superposition of orders can be exploited within the quantum computing domain as well, by relaxing the (traditional) assumption underlying quantum computation about applying gates in a well-defined cau...
Soshun Naito, Yasunari Suzuki, Yuuki Tokunaga • Published: 2026-01-14
In fault-tolerant quantum computing, a large number of physical qubits are required to construct a single logical qubit, and a single quantum node may be able to hold only a small number of logical qubits. In such a case, the idea of distributed fault-tolerant quantum computing (DFTQC) is important to demonstrate large-scale quantum computation using small-scale nodes. However, the design of distr...
Marvin Erdmann, Lukas Karch, Abhishek Awasthi, Caitlin Isobel Jones, Pallavi Bhardwaj, Florian Krellner, Jonas Stein, Claudia Linnhoff-Popien, Nico Kraus, Peter Eder, Sarah Braun, Tong Liu • Published: 2026-01-13
This whitepaper surveys the current landscape and short- to mid-term prospects for quantum-enabled optimization and machine learning use cases in industrial settings. Grounded in the QCHALLenge program, it synthesizes hardware trajectories from different quantum architectures and providers, and assesses their maturity and potential for real-world use cases under a standardized traffic-light evalua...
Viktor Khinevich, Wataru Mizukami • Published: 2026-01-13
We present systematic and resource-efficient constructions of continuous symmetry projectors, particularly $U(1)$ particle number and $SU(2)$ total spin, tailored for fault-tolerant quantum computations. Our approach employs a linear combination of unitaries (LCU) as well as generalized quantum signal processing (GQSP and GQSVT) to implement projectors. These projectors can then be coherently appl...
Giovanni de Felice, Boldizsár Poór, Cole Comfort, Lia Yeh, Mateusz Kupper, William Cashman, Bob Coecke • Published: 2026-01-13
Photonic systems offer a promising platform for interconnecting quantum processors and enabling scalable, networked architectures. Designing and verifying such architectures requires a unified formalism that integrates linear algebraic reasoning with probabilistic and control-flow structures. In this work, we introduce a graphical framework for distributed quantum computing that brings together li...
Kazuhiro Seki, Yuta Kikuchi, Tomoya Hayata, Seiji Yunoki • Published: 2026-01-13
We demonstrate a dissipative protocol for ground-state preparation of a quantum spin chain on a trapped-ion quantum computer. As a first step, we derive a Kraus representation of a dissipation channel for the protocol recently proposed by Ding et al. [Phys. Rev. Res. 6, 033147 (2024)] that still holds for arbitrary temporal discretization steps, extending the analysis beyond the Lindblad dynamics ...