{"artifact_id":"L1-153","layer":"L1","title":"Ghost Imaging (correlated-photon imaging)","domain":"Quantum Imaging","sub_domain":"Imaging via photon-pair correlations between bucket and reference","physics_fingerprint":{"L_DAG":4.2,"title":"Ghost Imaging (correlated-photon imaging)","domain":"Quantum Imaging","carrier":"photon","primitives":["L.photon_pair_source","D.bucket_detector","D.reference_imaging","L.correlation","int.temporal"],"sub_domain":"Imaging via photon-pair correlations between bucket and reference","noise_model":"shot_poisson","problem_class":"nonlinear_inverse","solution_space":"2D_intensity","difficulty_delta":10,"integration_axis":"temporal","sensing_mechanism":"photon_correlation_imaging"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 2D intensity is guaranteed within the declared Omega bounds. Uniqueness is local rather than global (non-convex landscape); convergence depends on initialisation and priors. Stability is moderately conditioned (kappa_eff ~= 30); photon_pair_rate dominates the stability cliff; accidental_coincidences and the remaining mismatch parameters contribute higher-order bias terms. Photon-shot-noise-limited (poisson counting) sets the irreducible data-fidelity floor, while TV / wavelet-sparsity / deep priors stabilise recovery at the ill-conditioned end of Omega.","secondary":"SSIM"},"size_tiers":{"center_spec":{"omega":{"H":128,"W":128,"N_pairs":100000,"bucket_SNR_dB":10,"photon_pair_rate":1.0,"reference_calibration":1.0,"accidental_coincidences":0.1,"environmental_decoherence":0.0},"input_format":"measurement_only","problem_class":"ghost_imaging","forward_operator":"ghost_imaging_forward","epsilon_fn_center":"18.0"},"omega_bounds":{"H":32,"W":32,"N_pairs":[1000,100000000],"bucket_SNR_dB":[0.0,30.0],"photon_pair_rate":[0.1,10.0],"reference_calibration":[0.3,1.0],"accidental_coincidences":[0.0,0.5],"environmental_decoherence":[0.0,0.5]},"epsilon_bounds":{"psnr_db":[5.0,40.0]},"allowed_problem_classes":["ghost_imaging"],"allowed_omega_dimensions":["H","W","N_pairs","bucket_SNR_dB","photon_pair_rate","accidental_coincidences","reference_calibration","environmental_decoherence","photon_pair_rate","accidental_coincidences","reference_calibration","environmental_decoherence"],"allowed_forward_operators":["ghost_imaging_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":10,"kappa":600,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0xb06391d95e4843afb8624a137b2b120388b1074027095e55a1dbb3f498d016ef","chain_tx_hash":"0x69513649625e504ee17741b4df3ab31017e91ac64380a6bb2596f338396eb455","chain_block":41554241}