{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:M6FI5S2YEA5NJHOQFUQN54KHOZ","short_pith_number":"pith:M6FI5S2Y","canonical_record":{"source":{"id":"2304.07828","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2023-04-16T16:41:52Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"1c6a2a453f86a1782ddb48cb8abbe998ebc9b6d6b7014d1ba942ddcecd6ee3c4","abstract_canon_sha256":"c32027673c4487d4e0bab675a1eda4b322f16195951104908f6e649ceee8d0c9"},"schema_version":"1.0"},"canonical_sha256":"678a8ecb58203ad49dd02d20def147767de575b5703461717e7f49f2211a158e","source":{"kind":"arxiv","id":"2304.07828","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2304.07828","created_at":"2026-07-05T07:47:01Z"},{"alias_kind":"arxiv_version","alias_value":"2304.07828v2","created_at":"2026-07-05T07:47:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2304.07828","created_at":"2026-07-05T07:47:01Z"},{"alias_kind":"pith_short_12","alias_value":"M6FI5S2YEA5N","created_at":"2026-07-05T07:47:01Z"},{"alias_kind":"pith_short_16","alias_value":"M6FI5S2YEA5NJHOQ","created_at":"2026-07-05T07:47:01Z"},{"alias_kind":"pith_short_8","alias_value":"M6FI5S2Y","created_at":"2026-07-05T07:47:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:M6FI5S2YEA5NJHOQFUQN54KHOZ","target":"record","payload":{"canonical_record":{"source":{"id":"2304.07828","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2023-04-16T16:41:52Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"1c6a2a453f86a1782ddb48cb8abbe998ebc9b6d6b7014d1ba942ddcecd6ee3c4","abstract_canon_sha256":"c32027673c4487d4e0bab675a1eda4b322f16195951104908f6e649ceee8d0c9"},"schema_version":"1.0"},"canonical_sha256":"678a8ecb58203ad49dd02d20def147767de575b5703461717e7f49f2211a158e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:47:01.580258Z","signature_b64":"TtMddoFJ7Mu3zsdM4CxZK1BR6gIeytoBRadbtfih+uPAeVHbbKuT7NnTDIU4zS9+TWOPjr6n6CX2NcGOJqDIAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"678a8ecb58203ad49dd02d20def147767de575b5703461717e7f49f2211a158e","last_reissued_at":"2026-07-05T07:47:01.579814Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:47:01.579814Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2304.07828","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:47:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NCAzLmXO8nCYrs0/ylIGUc8bP6L2DSrsIQoWAZ2FHvoaUI1pTYWffr5cyHhcBHmutZ/9y7brFlAcKvZ2V7L0BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T10:07:12.515252Z"},"content_sha256":"d97a719d288ef305c6c5d2e15ce971105291e77e9e88243d07654d1e6a00dbda","schema_version":"1.0","event_id":"sha256:d97a719d288ef305c6c5d2e15ce971105291e77e9e88243d07654d1e6a00dbda"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:M6FI5S2YEA5NJHOQFUQN54KHOZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Measurement principles for quantum spectroscopy of molecular materials with entangled photons","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["physics.chem-ph"],"primary_cat":"physics.optics","authors_text":"Ajay Ram Srimath Kandada, Antonio Perri, Chiara Trovatello, Cristian Manzoni, David Otto Tiede, Esteban Rojas-Gatjens, Evan J Kumar, Fabrizio Preda, Giulio Cerullo, Lorenzo Uboldi, Luca Moretti","submitted_at":"2023-04-16T16:41:52Z","abstract_excerpt":"Nonlinear spectroscopy with quantum entangled photons is an emerging field of research that holds the promise to achieve a superior signal-to-noise ratio and effectively isolate many-body interactions. Photon sources used for this purpose however lack the frequency tunability and spectral bandwidth demanded by contemporary molecular materials. Here, we present design strategies for efficient spontaneous parametric downconversion to generate biphoton states with adequate spectral bandwidth and at visible wavelengths. Importantly, we demonstrate, by suitable design of the nonlinear optical inter"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2304.07828","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2304.07828/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T07:47:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UiC8qtPDWlv5ua5StM5NkXY/AuqepXCjDTtDzrnStvTdppT8C4W3TmAsl2Fm8i93KUWwCJyga71fNjpJtusYBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T10:07:12.515639Z"},"content_sha256":"c8de20a2ea3ecc4fd5801cb121299a6ab713b4dcb73edea6769651b6b09760bd","schema_version":"1.0","event_id":"sha256:c8de20a2ea3ecc4fd5801cb121299a6ab713b4dcb73edea6769651b6b09760bd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/M6FI5S2YEA5NJHOQFUQN54KHOZ/bundle.json","state_url":"https://pith.science/pith/M6FI5S2YEA5NJHOQFUQN54KHOZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/M6FI5S2YEA5NJHOQFUQN54KHOZ/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-07T10:07:12Z","links":{"resolver":"https://pith.science/pith/M6FI5S2YEA5NJHOQFUQN54KHOZ","bundle":"https://pith.science/pith/M6FI5S2YEA5NJHOQFUQN54KHOZ/bundle.json","state":"https://pith.science/pith/M6FI5S2YEA5NJHOQFUQN54KHOZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/M6FI5S2YEA5NJHOQFUQN54KHOZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:M6FI5S2YEA5NJHOQFUQN54KHOZ","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"c32027673c4487d4e0bab675a1eda4b322f16195951104908f6e649ceee8d0c9","cross_cats_sorted":["physics.chem-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2023-04-16T16:41:52Z","title_canon_sha256":"1c6a2a453f86a1782ddb48cb8abbe998ebc9b6d6b7014d1ba942ddcecd6ee3c4"},"schema_version":"1.0","source":{"id":"2304.07828","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2304.07828","created_at":"2026-07-05T07:47:01Z"},{"alias_kind":"arxiv_version","alias_value":"2304.07828v2","created_at":"2026-07-05T07:47:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2304.07828","created_at":"2026-07-05T07:47:01Z"},{"alias_kind":"pith_short_12","alias_value":"M6FI5S2YEA5N","created_at":"2026-07-05T07:47:01Z"},{"alias_kind":"pith_short_16","alias_value":"M6FI5S2YEA5NJHOQ","created_at":"2026-07-05T07:47:01Z"},{"alias_kind":"pith_short_8","alias_value":"M6FI5S2Y","created_at":"2026-07-05T07:47:01Z"}],"graph_snapshots":[{"event_id":"sha256:c8de20a2ea3ecc4fd5801cb121299a6ab713b4dcb73edea6769651b6b09760bd","target":"graph","created_at":"2026-07-05T07:47:01Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2304.07828/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Nonlinear spectroscopy with quantum entangled photons is an emerging field of research that holds the promise to achieve a superior signal-to-noise ratio and effectively isolate many-body interactions. Photon sources used for this purpose however lack the frequency tunability and spectral bandwidth demanded by contemporary molecular materials. Here, we present design strategies for efficient spontaneous parametric downconversion to generate biphoton states with adequate spectral bandwidth and at visible wavelengths. Importantly, we demonstrate, by suitable design of the nonlinear optical inter","authors_text":"Ajay Ram Srimath Kandada, Antonio Perri, Chiara Trovatello, Cristian Manzoni, David Otto Tiede, Esteban Rojas-Gatjens, Evan J Kumar, Fabrizio Preda, Giulio Cerullo, Lorenzo Uboldi, Luca Moretti","cross_cats":["physics.chem-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2023-04-16T16:41:52Z","title":"Measurement principles for quantum spectroscopy of molecular materials with entangled photons"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2304.07828","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:d97a719d288ef305c6c5d2e15ce971105291e77e9e88243d07654d1e6a00dbda","target":"record","created_at":"2026-07-05T07:47:01Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"c32027673c4487d4e0bab675a1eda4b322f16195951104908f6e649ceee8d0c9","cross_cats_sorted":["physics.chem-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2023-04-16T16:41:52Z","title_canon_sha256":"1c6a2a453f86a1782ddb48cb8abbe998ebc9b6d6b7014d1ba942ddcecd6ee3c4"},"schema_version":"1.0","source":{"id":"2304.07828","kind":"arxiv","version":2}},"canonical_sha256":"678a8ecb58203ad49dd02d20def147767de575b5703461717e7f49f2211a158e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"678a8ecb58203ad49dd02d20def147767de575b5703461717e7f49f2211a158e","first_computed_at":"2026-07-05T07:47:01.579814Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:47:01.579814Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TtMddoFJ7Mu3zsdM4CxZK1BR6gIeytoBRadbtfih+uPAeVHbbKuT7NnTDIU4zS9+TWOPjr6n6CX2NcGOJqDIAw==","signature_status":"signed_v1","signed_at":"2026-07-05T07:47:01.580258Z","signed_message":"canonical_sha256_bytes"},"source_id":"2304.07828","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d97a719d288ef305c6c5d2e15ce971105291e77e9e88243d07654d1e6a00dbda","sha256:c8de20a2ea3ecc4fd5801cb121299a6ab713b4dcb73edea6769651b6b09760bd"],"state_sha256":"68516e4e98432c77342a8d52a0b0bfdd12ac65b2f3d1abb15189888fdc4afa09"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NM6Nv0gCl7C8f4lr6kWdh+baM79I1EaDwYXhrLg3vqj8fqWW+LzzYMwXXEMvXN4amwbAcqdA6UQ55V3fAdtJCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T10:07:12.517598Z","bundle_sha256":"6ba1f4a68a9e4e239e1e7693718ff0b896f7d8248ec91e5a64f7f6e778243799"}}