{"artifact_id":"L1-155","layer":"L1","title":"Entangled-Photon Microscopy (N00N / SPDC imaging)","domain":"Quantum Imaging","sub_domain":"Phase sensitivity beyond shot-noise via N-photon entanglement","physics_fingerprint":{"L_DAG":4.5,"title":"Entangled-Photon Microscopy (N00N / SPDC imaging)","domain":"Quantum Imaging","carrier":"photon","primitives":["L.spdc_source","L.n_photon_interference","D.coincidence_count","int.angular"],"sub_domain":"Phase sensitivity beyond shot-noise via N-photon entanglement","noise_model":"shot_poisson","problem_class":"nonlinear_inverse","solution_space":"2D_phase","difficulty_delta":10,"integration_axis":"spatial","sensing_mechanism":"entangled_photon_imaging"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 2D phase 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_loss dominates the stability cliff; mode_coupling_efficiency 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":256,"W":256,"N_photons":2,"photon_loss":0.3,"N_coincidences":100000,"phase_instability":0.0,"detector_dark_counts":0.01,"mode_coupling_efficiency":0.5},"input_format":"measurement_only","problem_class":"entangled_photon_microscopy","forward_operator":"entangled_photon_microscopy_forward","epsilon_fn_center":"16.0"},"omega_bounds":{"H":64,"W":64,"N_photons":[2,10],"photon_loss":[0.0,0.9],"N_coincidences":[1000,100000000],"phase_instability":[0.0,0.5],"detector_dark_counts":[0.0,1.0],"mode_coupling_efficiency":[0.1,1.0]},"epsilon_bounds":{"psnr_db":[5.0,40.0]},"allowed_problem_classes":["entangled_photon_microscopy"],"allowed_omega_dimensions":["H","W","N_photons","N_coincidences","photon_loss","mode_coupling_efficiency","detector_dark_counts","phase_instability","photon_loss","mode_coupling_efficiency","detector_dark_counts","phase_instability"],"allowed_forward_operators":["entangled_photon_microscopy_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":"0x2462745509ce83bcf98cd62c882c8843238dd7818bf8c2aef6892b03fdd06d09","chain_tx_hash":"0x6a186a8078f676549c0981d4dd7c97fbd2449fcdc2187a16981c6389b131f0d5","chain_block":41554241}