arxiv: 2604.21695 · v1 · submitted 2026-04-23 · 🪐 quant-ph

Recognition: unknown

Lagrange: Operating Italy's First Publicly-Accessible Quantum Computer for Research and Education

Paolo Viviani , Fabrizio Bertone , Giacomo Vitali , Emanuele Dri , Federico Stirano , Giuseppe Caragnano , Francesco Lubrano , Antonino Nespola

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Olivier Terzo Matteo Cocuzza Bartolomeo Montrucchio Giovanna Turvani Gianluca Bertaina Marco Coisson Davide Calonico Fabrizio Pirri Pietro Asinari

Authors on Pith no claims yet

Pith reviewed 2026-05-09 21:38 UTC · model grok-4.3

classification 🪐 quant-ph

keywords quantum computingmiddlewareAPI proxysuperconducting qubitsaccess managementquantum educationresearch infrastructureItaly

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The pith

A middleware proxy has turned a five-qubit quantum computer into Italy's first fully operational machine open to students, researchers, and the public.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The authors describe the design and nine-month operation of software that manages access to Lagrange, a five-qubit superconducting quantum computer installed in Italy. They created a proxy layer that adds project budgets, reservations, and fair-usage rules to the vendor's basic authentication system without altering any client software. A reader would care because the setup lets multiple institutions and the general public share the device under formal agreements while keeping it reliable enough for daily use. The record shows the machine has handled over 240,000 jobs with greater than 98 percent uptime, including routine use in university lectures and exams.

Core claim

The authors present Lagrange as Italy's first fully operational quantum computer accessible to students, researchers from multiple institutions under service agreements, and the general public under commercial agreements. They achieved this by building a modular middleware layer that intercepts vendor API calls through a proxy to enforce budgets, authorization, and fairness policies. The system uses a plugin architecture to separate vendor-specific logic from site policies, has processed over 240,000 quantum jobs totaling more than one week of QPU time, and maintained greater than 98 percent uptime since entering production in September 2025.

What carries the argument

A modular middleware layer that acts as an API proxy to intercept vendor calls and enforce project-based budgets, reservation-aware authorization, and per-user fairness policies while using plugins to keep vendor logic separate from site-specific rules.

Load-bearing premise

Intercepting and proxying the vendor API calls will not introduce unacceptable latency, security exposure, or compatibility problems that would prevent reliable operation under the described access policies.

What would settle it

A direct measurement showing that the middleware adds more than a few hundred milliseconds of latency to job submissions, allows unauthorized users to bypass policies, or causes repeated job failures due to proxy issues would falsify the claim of reliable operation.

Figures

Figures reproduced from arXiv: 2604.21695 by Antonino Nespola, Bartolomeo Montrucchio, Davide Calonico, Emanuele Dri, Fabrizio Bertone, Fabrizio Pirri, Federico Stirano, Francesco Lubrano, Giacomo Vitali, Gianluca Bertaina, Giovanna Turvani, Giuseppe Caragnano, Marco Coisson, Matteo Cocuzza, Olivier Terzo, Paolo Viviani, Pietro Asinari.

**Figure 2.** Figure 2: Sequence diagram of the job submission and completion flow. [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗

read the original abstract

We describe the design, implementation, and nine-month operational experience of the software management stack for Lagrange, an IQM Spark five-qubit superconducting quantum computer jointly acquired by LINKS Foundation, Politecnico di Torino and the Italian National Institute of Metrological Research (INRiM), and managed by LINKS. Lagrange is, to our knowledge, the first quantum computer in Italy that is fully operational and accessible to students and researchers from multiple institutions under formal service agreements, and to the general public under commercial agreements. When installed in mid-2025, the IQM Spark hardware was delivered by the vendor with authentication only: no billing, project management or fair usage enforcement were provided. We developed a modular middleware layer that filled that gap without modifying any vendor client software, by intercepting API calls through a proxy that enforces project-based budgets, reservation-aware authorisation, and per-user fairness policies. The middleware adopts a plugin architecture that cleanly separates vendor-specific logic from site-specific policies, enabling reuse across different quantum hardware backends and deployment contexts. Since entering production in September 2025, the system has processed over 240,000 quantum jobs totalling more than 1 week of QPU execution time, with greater than 98% uptime. Notably, students at Politecnico di Torino regularly use the machine during both lectures and formal examinations -- a practice we believe to be unique in Europe. We report on the system architecture, the operational lessons learned, and the infrastructure choices that made this deployment possible.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

This is a straightforward operational report on Italy's first public 5-qubit quantum computer, with solid usage numbers but no new algorithms or physics.

read the letter

The key takeaway is that the team built and ran a working public-access system for an IQM Spark machine using a proxy middleware that adds budgets, reservations, and fairness without changing vendor clients. They report over 240,000 jobs, more than a week of QPU time, and 98% uptime over nine months, plus regular use in university lectures and exams at Politecnico di Torino. That combination of deployment scale and educational integration is new for Italy and not documented elsewhere in the cited literature. The modular plugin design that separates vendor logic from local policies is a practical choice and seems to have worked without major compatibility hits. The metrics directly back the claim that the system stayed reliable under real load. What the paper does well is give concrete numbers on job volume, uptime, and exam usage instead of just describing the architecture. Those details make the experience usable for others planning similar setups. The soft spots are that this is almost entirely a descriptive engineering log rather than a research contribution. There are no comparisons to other middleware approaches, no latency or security measurements beyond the uptime figure, and no discussion of what happens when policies conflict with vendor updates. The claim that exam usage is unique in Europe rests on the authors' belief rather than a survey. The work stays within one 5-qubit machine and one set of institutions, so broader lessons are limited. This paper is for groups building or operating shared quantum hardware, especially those needing policy enforcement on top of commercial backends. A reader who wants implementation details on proxy-based access control and real-world operational data will find it useful. It is not for people looking for new quantum algorithms or hardware advances. The paper shows clear thinking about the practical gaps in vendor offerings and how to fill them without breaking existing clients. I would send it to peer review as a case study on quantum infrastructure deployment; the evidence for successful operation is direct and the architecture choices are reproducible enough to be worth referee scrutiny.

Referee Report

0 major / 4 minor

Summary. The manuscript describes the design, implementation, and nine-month operational experience of a modular middleware stack for Lagrange, an IQM Spark five-qubit superconducting quantum computer jointly acquired and managed by LINKS Foundation, Politecnico di Torino, and INRiM. The central contribution is a non-intrusive proxy layer that intercepts vendor API calls to enforce project budgets, reservation-aware authorization, and per-user fairness policies without modifying any vendor client software. The authors report that the system has processed over 240,000 quantum jobs (more than one week of QPU time) with greater than 98% uptime since entering production in September 2025, and note its routine use by students during lectures and formal examinations at Politecnico di Torino.

Significance. If the reported metrics and architecture hold, the work provides a concrete, reproducible example of operating a publicly accessible quantum computing resource under formal service agreements for both research and education. The plugin architecture cleanly separating vendor-specific logic from site policies, together with the empirical evidence of 240k+ jobs processed and >98% uptime, constitutes a practical demonstration of feasibility that other institutions could adapt. The educational integration, including exam usage, adds a distinctive applied dimension to the growing body of quantum infrastructure reports.

minor comments (4)

[Section 3] In the architecture section, the description of how the proxy handles concurrent reservations and budget enforcement would be clearer with a short pseudocode snippet or state diagram illustrating the decision flow.
[Section 4] The uptime figure (>98%) is presented without an explicit definition (e.g., whether it excludes scheduled maintenance or measures only middleware availability); adding this would aid reproducibility.
Several acronyms (QPU, API, INRiM) appear before their first full expansion in the main text; a brief acronym table or consistent first-use definitions would improve readability.
[Introduction] The abstract states the system is 'to our knowledge' the first such facility in Italy; the introduction could briefly note the search or sources used to support this claim.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive and accurate summary of our manuscript, as well as for the recommendation to accept. The review correctly identifies the core technical contribution (the non-intrusive proxy middleware) and the operational results (240k+ jobs, >98% uptime, educational use including examinations).

Circularity Check

0 steps flagged

No significant circularity; purely descriptive deployment report

full rationale

The paper contains no derivations, equations, predictions, fitted parameters, or load-bearing self-citations. It is a factual engineering report on system architecture, middleware proxy implementation, operational metrics (240k+ jobs, >98% uptime), and usage examples. The central claim of being the first such accessible quantum computer in Italy is evidenced directly by the described deployment and statistics, without reduction to self-definition, renaming, or imported uniqueness theorems. All elements are self-contained against external benchmarks of reported operation.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

This is an engineering deployment report with no mathematical models, physical derivations, or theoretical claims; therefore no free parameters, axioms, or invented entities are required or introduced.

pith-pipeline@v0.9.0 · 5640 in / 1121 out tokens · 28709 ms · 2026-05-09T21:38:28.606897+00:00 · methodology

discussion (0)

Reference graph

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