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abstract indexed · arXiv 2609.16823 · updated 2026-10-18

LCAP: Population-Informed Latent Chip Adaptation from Few Output Probes for Photonic Neural Networks

First page of LCAP: Population-Informed Latent Chip Adaptation from Few Output Probes for Photonic Neural Networks
From the original paper · arXiv 2609.16823Page 1. Select the image to read the PDF.

LCAP replaces per-device optimization-based calibration of photonic neural network chips with a shared population correction plus feed-forward latent personalization inferred from 32 unlabeled output probes. It costs an offline stage requiring 80 historical calibrated chips to learn the shared correction and latent space, and the reported gains are demonstrated only on a three-layer MZI simulator, not fabricated hardware. It can fail if the target fleet's error distribution drifts from the historical population, if 32 probes insufficiently identify a device's latent coordinates, or if simulator-modeled noise (phase variation, crosstalk, quantization) underestimates real fabrication effects.

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Population-informed photonic chip calibration via latent probes
published
2026-09-15

The method addresses analog photonic accelerator calibration, a hardware domain outside the reader's LLM inference and training practice, so it offers no adoptable technique for a 24 GB GPU or API-based workflow.

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Overview. Let 𝜽0∈ℝd denote the programmable parameters of a source PNN optimized under the ideal device model, and let fchw​(⋅,𝜽) denote its realization on chip c. LCAP follows a common-first, individuality-second principle (Fig. 2). For an unseen chip u, its adapted parameters are written as

𝜽^u=𝜽pop+𝜹^u,

equation (1) · §2 Method: Latent Chip Adaptation from Probes · proposed method

Population-shared calibration. Given N historical chips ℋ, we optimize one common parameter vector over the entire population:

𝜽pop=arg⁡min𝜽​[1N​∑c∈ℋℒc​(𝜽)+λp​‖𝜽−𝜽0‖22],

equation (2) · §2 Method: Latent Chip Adaptation from Probes · baseline

such that

𝜹c≈𝝁+𝐁𝐳c.

equation (7) · §2 Method: Latent Chip Adaptation from Probes · proposed method

equations from arXiv HTML · fetched 2026-10-16

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    LCAP replaces per-device optimization-based calibration of photonic neural network chips with a shared population correction plus feed-forward latent personalization inferred from 32 unlabeled output probes. It costs an offline stage requiring 80 historical calibrated chips to learn the shared correction and latent space, and the reported gains are demonstrated only on a three-layer MZI simulator, not fabricated hardware. It can fail if the target fleet's error distribution drifts from the historical population, if 32 probes insufficiently identify a device's latent coordinates, or if simulator-modeled noise (phase variation, crosstalk, quantization) underestimates real fabrication effects.

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  2. claim 02Paperraft inference

    Accuracy improves from 80.41% direct deployment to 93.36% with LCAP on a simulated 64-mode photonic neural network; worst-device accuracy rises from 89.18% to 90.54%.

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