Searcharxiv⌕ Search
Home/Archive/arXiv

arXiv · 2610.37204

QNETSIM for memory assisted design of satellite and hybrid quantum networks

Seid Koudia·Francesco Vista·Heyang Peng·Ilora Maity·Intidhar Bedhief·Juan Carlos Hernandez Hernandez·Symeon Chatzinotas
View original source ↗Read source document ↗Export metadata ↓

Abstract

Space-based quantum information networks require simulation tools that capture orbital dynamics, probabilistic quantum operations, and classical coordination. We introduce QNETSIM, a modular discrete-event simulator for the design and performance evaluation of satellite and hybrid space-ground quantum networks. The framework integrates orbital geometry, free-space optical and fiber channels, quantum memories, entanglement generation, and Bell-state measurements within a common event-driven architecture. Physical models account for optical loss, atmospheric turbulence, detector imperfections, finite memory capacity, and storage-induced decoherence. Space-time routing and segmented nesting support entanglement distribution across changing topologies, while a software-defined control plane coordinates generation, storage, and swapping. Configurable scenarios encompass onboard repeaters, satellite constellations, ground-based repeaters, and direct satellite distribution. Through explicit interfaces between physical models, network protocols, and orchestration, QNETSIM links component characteristics and operational policies to entanglement fidelity, throughput, latency, availability, and memory utilization, enabling systematic exploration of architectural and resource-management trade-offs in future space-based quantum information networks.

Explore related subjects

quant-ph

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Seid Koudia, Francesco Vista, Heyang Peng, Ilora Maity, Intidhar Bedhief, Juan Carlos Hernandez Hernandez, Symeon Chatzinotas. 2026-10-27. QNETSIM for memory assisted design of satellite and hybrid quantum networks. https://arxiv.org/abs/2610.37204

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Operator quantum singular value transformation: Spectral mapping, design and topological invariants

Quantum singular value transformation (QSVT) provides a unifying framework for quantum algorithms by applying the polynomials of quantum signal processing (QSP) to block-encoded matrices. We connect this framework with spectral analysis, design and topological protection in condensed matter physics. Extending QSVT beyond matrices to possibly infinite-dimensional operators (operator QSVT), we establish the following. First, it transforms every block of the operator by the QSP polynomials; no singular value decomposition is needed. Second, a spectral mapping theorem determines the full spectrum of the QSVT operator, including continuous spectra, from the embedded operator through the QSP polynomial, allowing spectral analysis without translation invariance. Third, the spectral mapping turns QSP into spectral design: the QSP phases can stretch, fold and separate the bands and place the eigenvalues. Finally, the kernel sectors that conventional QSVT usually sets aside carry a topological index, invariant under the choice of QSP phases, local perturbations and gap-preserving deformations, which guarantees topologically protected states. These results unify two quantum walks: Szegedy's walk from quantum algorithms and the split-step walk from condensed matter physics. Their kernel sectors encode the graph's Euler characteristic and the difference of bulk winding numbers, respectively. For the split-step walk, QSP breaks chiral symmetry but not the topological protection, and can move the protected state into a continuous band to form a bound state in the continuum (BIC).

quant-ph↗
arXiv2026

Tensor-network simulation of quantum phase estimation in the von Neumann measurement formulation with DMRG-prepared initial states

The von Neumann measurement formulation of quantum phase estimation [Phys.\ Rev.\ A \textbf{66}, 032314 (2002); Quantum \textbf{5}, 465 (2021)] estimates energies by coupling the system to a discretized pointer register through $\hat H\otimes\hat p$ and reading out the pointer after an inverse quantum Fourier transform. Building on these works, we develop a tensor-network framework for simulating and benchmarking this protocol when the system is initialized in a matrix product state (MPS) pre-trained with the density matrix renormalization group (DMRG). The system and the pointer are represented as a composite MPS, the coupling $\hat H\otimes\hat p$ as a matrix product operator, and the coupled dynamics is evolved with the time-dependent variational principle. This gives direct access to the time-resolved pointer distribution, the recovered energy, and the entanglement generated between system and pointer. We apply the framework to quantum many-body spin systems and to electronic-structure problems. For the systems studied, the pointer readout yields accurate ground-state energy estimates from DMRG-prepared approximate states, even when their variational energies are not fully converged. These states generally contain contributions from both ground and excited eigenstates, with their spectral weights determining the corresponding contributions to the pointer distribution. More accurate initial states also strongly suppress the entanglement generated between system and pointer. We also provide logical and compiled resource estimates for a Suzuki--Trotter realization of the protocol.

quant-ph↗
arXiv2026

Robust Preparation of Bell States by Time Boundary Effect

Quantum entanglement is essential for modern quantum information processing. Entanglement gates convert initially non-entangled states into entangled ones by applying time-dependent parametric pulses. While Bell state preparation has been experimentally validated in various platforms, its stability and fidelity are constrained by environmental decoherence and parametric fluctuations. Here, we propose a dynamically robust method for preparing Bell states by leveraging the time boundary effect and momentum-space projective measurements within Su-Schrieffer-Heeger systems. Employing the Lindblad master equation, we theoretically demonstrate that the prepared Bell states exhibit remarkable robustness against both environmental decoherence and parametric time fluctuations, achieving nearly perfect quantum fidelity, with the momentum conservation law governing this robust behavior. This framework based on the time boundary effect is applicable to both fermionic and bosonic excitations, offering a unified paradigm for generating Bell states in quantum computation and communication.

quant-ph↗