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arxiv: 2509.08328 · v2 · submitted 2025-09-10 · 🪐 quant-ph

Towards solving industrial integer linear programs with Decoded Quantum Interferometry

Pith reviewed 2026-05-18 18:32 UTC · model grok-4.3

classification 🪐 quant-ph
keywords decoded quantum interferometryinteger linear programmax-XORSATbelief propagationvehicle option pricingquantum circuitLDPC decoding
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The pith

Converting industrial integer linear programs to max-XORSAT enables decoded quantum interferometry with belief propagation to address vehicle pricing optimization.

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

The paper aims to show that decoded quantum interferometry can be used for solving an industrial integer linear program from the automotive sector by transforming it into a max-XORSAT problem. This matters to a sympathetic reader because it provides a concrete way to bring quantum methods to practical optimization tasks like setting prices for vehicle options and packages. The authors develop the full pipeline including the formulation, conversion, and a quantum circuit for the belief propagation decoder. They test it against standard solvers to assess its potential.

Core claim

By formulating the vehicle option-package pricing problem as an integer linear program and converting it to max-XORSAT instances, the authors implement decoded quantum interferometry using a belief propagation algorithm realized on a quantum circuit, offering a general method applicable to other industrially relevant integer linear programs.

What carries the argument

The transformation of the integer linear program into max-XORSAT followed by quantum-circuit belief propagation decoding within the decoded quantum interferometry framework.

If this is right

  • Industrial optimization problems expressed as integer linear programs become solvable via decoded quantum interferometry after conversion to max-XORSAT.
  • The belief propagation heuristic can be embedded in a quantum circuit to decode the solutions.
  • Effectiveness is demonstrated through direct comparison with the Gurobi solver and a random sampling baseline on the specific problem instances.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If the conversion process is general and efficient, similar techniques could apply decoded quantum interferometry to a wider range of supply chain or configuration problems.
  • Performance advantages may appear in instances where the max-XORSAT structure aligns well with low-density parity-check code properties used in the decoding.

Load-bearing premise

The conversion from the vehicle option-package integer linear program to max-XORSAT instances must preserve enough of the original optimization structure for the belief propagation decoder to yield competitive solutions.

What would settle it

If benchmarks show that the decoded quantum interferometry solutions are no better than random sampling or consistently inferior to Gurobi outputs on the tested instances, the claim of practical applicability would be falsified.

Figures

Figures reproduced from arXiv: 2509.08328 by Carlos A. Riofrio, Francesc Sabater, Geert-Jan Besjes, Jean-Francois Bobier, Johannes Klepsch, Jonas Hiltrop, Marvin Erdmann, Ouns El Harzli, Yudong Cao.

Figure 1
Figure 1. Figure 1: Success rate of our implementation of the BP1 decoder for the zero code-word for [PITH_FULL_IMAGE:figures/full_fig_p008_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Quantum circuit construction inspired by Ref. [ [PITH_FULL_IMAGE:figures/full_fig_p011_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: First iteration of the quantum-circuit implementation of the Binary Belief Propagation [PITH_FULL_IMAGE:figures/full_fig_p012_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Second iteration of the quantum-circuit implementation of the Binary Belief Propagation [PITH_FULL_IMAGE:figures/full_fig_p013_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Final step of the quantum-circuit implementation of the BP1 algorithm for the [PITH_FULL_IMAGE:figures/full_fig_p014_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Schematic for building an encoding for integer addition (an “integer adder circuit”) using [PITH_FULL_IMAGE:figures/full_fig_p020_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Schematic for building an encoding for weighted integer addition (a “weighted integer adder”) [PITH_FULL_IMAGE:figures/full_fig_p021_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Schematic illustration for the multiple integer adder circuit using the weighted integer adder [PITH_FULL_IMAGE:figures/full_fig_p024_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Schematic illustration of how integer comparator computes the intermediate quantity [PITH_FULL_IMAGE:figures/full_fig_p025_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Success rate of our implementation of a state-of-the-art, soft-decision, belief propagation [PITH_FULL_IMAGE:figures/full_fig_p029_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Performance comparison of DQI for downscaled max-XORSAT instances derived from the [PITH_FULL_IMAGE:figures/full_fig_p034_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: Number of qubits required to implement the proposed DQI circuit for downscaled max [PITH_FULL_IMAGE:figures/full_fig_p036_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: Total number of gates required to implement the proposed DQI circuit after transpilation [PITH_FULL_IMAGE:figures/full_fig_p037_13.png] view at source ↗
Figure 14
Figure 14. Figure 14: Total number of gates of each type required to implement the proposed DQI circuit after [PITH_FULL_IMAGE:figures/full_fig_p037_14.png] view at source ↗
Figure 15
Figure 15. Figure 15: Histogram of the number of satisfied constraints obtained from DQI sampling for different [PITH_FULL_IMAGE:figures/full_fig_p038_15.png] view at source ↗
Figure 16
Figure 16. Figure 16: Comparison between predicted and empirical average number of satisfied constraints across [PITH_FULL_IMAGE:figures/full_fig_p039_16.png] view at source ↗
Figure 17
Figure 17. Figure 17: Success rate of the Gauss-Jordan decoder for the zero codeword for [PITH_FULL_IMAGE:figures/full_fig_p044_17.png] view at source ↗
read the original abstract

Optimization via decoded quantum interferometry (DQI) has recently gained a great deal of attention as a promising avenue for solving optimization problems using quantum computers. In this paper, we apply DQI to an industrial optimization problem in the automotive industry: the vehicle option-package pricing problem. Our main contributions are 1) formulating the industrial problem as an integer linear program (ILP), 2) converting the ILP into instances of max-XORSAT, and 3) developing a detailed quantum circuit implementation for belief propagation, a heuristic algorithm for decoding LDPC codes. Thus, we provide a full implementation of the DQI algorithm using Belief Propagation, which can be applied to any industrially relevant ILP by first transforming it into a max-XORSAT instance. We also evaluate the effectiveness of our implementation by benchmarking it against both Gurobi and a random sampling baseline.

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.

Referee Report

1 major / 2 minor

Summary. The paper formulates the vehicle option-package pricing problem as an integer linear program (ILP), converts it to max-XORSAT instances, provides a detailed quantum circuit implementation of belief propagation for decoding in the Decoded Quantum Interferometry (DQI) framework, and benchmarks the approach against Gurobi and random sampling. It claims this pipeline yields a full implementation applicable to any industrially relevant ILP via the ILP-to-max-XORSAT transformation.

Significance. If the ILP-to-max-XORSAT mapping preserves objective equivalence and belief propagation decoding recovers competitive solutions, the work could demonstrate a practical route for applying DQI to industrial optimization. The explicit circuit implementation and intent to benchmark against a commercial solver are strengths; reproducible code or parameter-free derivations would further strengthen the contribution.

major comments (1)
  1. [formulation and conversion section] Formulation and conversion section: the central claim that the pipeline applies to any industrially relevant ILP and yields competitive solutions with Gurobi requires that low-energy assignments of the max-XORSAT instance correspond to high-quality (or feasible) solutions of the original ILP. No explicit bounds, objective-equivalence proof, or analysis of how auxiliary variables or integrality relaxation affect the objective are provided; without this, it is unclear whether BP decoding on the DQI circuit can recover useful ILP solutions rather than XORSAT-optimal but ILP-suboptimal assignments.
minor comments (2)
  1. [abstract] Abstract and results section: quantitative benchmarking details (instance sizes, number of trials, error bars, or specific objective values versus Gurobi) are referenced but not summarized; these should be stated explicitly to support the effectiveness claims.
  2. [quantum circuit implementation] Quantum circuit implementation: the description of the belief-propagation decoder circuit would benefit from a pseudocode listing or additional diagram to clarify gate counts and depth for the LDPC decoding step.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their constructive comments, which highlight an important point for strengthening the clarity of our claims. We address the major comment below.

read point-by-point responses
  1. Referee: Formulation and conversion section: the central claim that the pipeline applies to any industrially relevant ILP and yields competitive solutions with Gurobi requires that low-energy assignments of the max-XORSAT instance correspond to high-quality (or feasible) solutions of the original ILP. No explicit bounds, objective-equivalence proof, or analysis of how auxiliary variables or integrality relaxation affect the objective are provided; without this, it is unclear whether BP decoding on the DQI circuit can recover useful ILP solutions rather than XORSAT-optimal but ILP-suboptimal assignments.

    Authors: We agree that the manuscript would benefit from a more explicit treatment of objective equivalence to fully support the claim of applicability to arbitrary ILPs. The ILP-to-max-XORSAT conversion encodes each linear constraint via auxiliary variables into XOR clauses while preserving the original objective through additional penalty clauses; feasible integer solutions of the ILP map directly to satisfying assignments of the XORSAT instance, with the objective value preserved up to an additive constant independent of the auxiliaries. No integrality relaxation is performed. We will add a dedicated subsection to the formulation section containing a formal equivalence argument, including bounds on the contribution of auxiliary variables and a proof that XORSAT-optimal assignments yield ILP-optimal or near-optimal solutions. This will clarify that belief-propagation decoding targets solutions that remain competitive for the original problem. revision: yes

Circularity Check

0 steps flagged

No significant circularity in the derivation chain

full rationale

The paper presents a constructive pipeline: formulate the vehicle option-package problem as an ILP, apply a standard ILP-to-max-XORSAT conversion, then implement DQI decoding via belief propagation on the resulting instance. These steps are described as direct applications of existing transformations and heuristics rather than any self-referential fitting, redefinition of outputs as inputs, or load-bearing self-citations that collapse the claimed result back to the input data by construction. The central claim is an end-to-end implementation and benchmarking against Gurobi, which remains independent of the paper's own fitted values or prior self-referential theorems.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Based solely on the abstract, the approach rests on standard properties of ILP-to-max-XORSAT reductions and the applicability of belief propagation to LDPC-style decoding; no explicit free parameters, new entities, or ad-hoc axioms are introduced in the high-level description.

axioms (1)
  • domain assumption Belief propagation serves as an effective heuristic decoder for the max-XORSAT instances obtained from the target ILP.
    The paper develops a quantum circuit for this decoding step without providing independent verification of its performance on the specific instances.

pith-pipeline@v0.9.0 · 5715 in / 1545 out tokens · 58696 ms · 2026-05-18T18:32:12.495930+00:00 · methodology

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Forward citations

Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

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  2. Multivariate Decoded Quantum Interferometry for Weighted Optimization

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  3. From Constraint to Code: DQI-Kit -- A Software Framework for Decoded Quantum Interferometry

    quant-ph 2026-05 unverdicted novelty 6.0

    DQI-Kit automates encoding of objectives and constraints into Max-LINSAT instances and estimates expected DQI performance on the resulting problems.

  4. Hybrid Quantum-HPC Middleware Systems for Adaptive Resource, Workload and Task Management

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    The authors present Pilot-Quantum, a middleware for adaptive resource management in hybrid quantum-HPC systems, along with execution motifs and a performance modeling toolkit called Q-Dreamer.

  5. Quantum Decoding Algorithms: Quantum Speedups in Optimization

    quant-ph 2026-05 unverdicted novelty 1.0

    A review describing the Decoded Quantum Interferometry algorithm for quantum speedups in max-LINSAT optimization, with claimed superpolynomial advantage in the OPI problem.

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