{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:MQUVCQ4UMYF4ATY35ZU6SXOW5E","short_pith_number":"pith:MQUVCQ4U","canonical_record":{"source":{"id":"1804.01541","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-04-04T18:00:13Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"f2eb03045ef00d277036de3d3a7b21a6e80e1ec308b729c99cad35710603d9b7","abstract_canon_sha256":"b21fffe77c3dbc50b6eb669bbb614836e00a1a6905587a109ea304ea8bac7d28"},"schema_version":"1.0"},"canonical_sha256":"6429514394660bc04f1bee69e95dd6e911af77fabeb7fb4a1a706222379860cb","source":{"kind":"arxiv","id":"1804.01541","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.01541","created_at":"2026-05-18T00:16:24Z"},{"alias_kind":"arxiv_version","alias_value":"1804.01541v1","created_at":"2026-05-18T00:16:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.01541","created_at":"2026-05-18T00:16:24Z"},{"alias_kind":"pith_short_12","alias_value":"MQUVCQ4UMYF4","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"MQUVCQ4UMYF4ATY3","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"MQUVCQ4U","created_at":"2026-05-18T12:32:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:MQUVCQ4UMYF4ATY35ZU6SXOW5E","target":"record","payload":{"canonical_record":{"source":{"id":"1804.01541","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-04-04T18:00:13Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"f2eb03045ef00d277036de3d3a7b21a6e80e1ec308b729c99cad35710603d9b7","abstract_canon_sha256":"b21fffe77c3dbc50b6eb669bbb614836e00a1a6905587a109ea304ea8bac7d28"},"schema_version":"1.0"},"canonical_sha256":"6429514394660bc04f1bee69e95dd6e911af77fabeb7fb4a1a706222379860cb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:16:24.912525Z","signature_b64":"mRJs2O/jMnM5rgRBIzjUuougUqY/2U7JSLaakki8zA8VIsWJ7sYotLBgWOlRO67pPYQkaZqie2UqzRHUQ2IGAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6429514394660bc04f1bee69e95dd6e911af77fabeb7fb4a1a706222379860cb","last_reissued_at":"2026-05-18T00:16:24.911915Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:16:24.911915Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.01541","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:16:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qOoh4cW2JzGik4MvGpC05FqM3+UDQDHznTFtdVSy7H+afcxCFF6BfnDJwOtr0ez6W2UREsY/t9+lTT7VS2LgBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T04:40:38.641763Z"},"content_sha256":"0bfe4bf2ed4f7935287fd3e76b046963e35a41686693369e5a16bf615b87a7c6","schema_version":"1.0","event_id":"sha256:0bfe4bf2ed4f7935287fd3e76b046963e35a41686693369e5a16bf615b87a7c6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:MQUVCQ4UMYF4ATY35ZU6SXOW5E","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Faster light with competing absorption and gain","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"physics.optics","authors_text":"Jon D. Swaim, Ryan T. Glasser","submitted_at":"2018-04-04T18:00:13Z","abstract_excerpt":"We experimentally investigate the propagation of optical pulses through a fast-light medium with competing absorption and gain. The combination of strong absorption and optical amplification in a potassium-based four-wave mixing process results in pulse peak advancements up to $88\\%$ of the input pulse width, more than $35 \\times$ that which is achievable without competing absorption. We show that the enhancement occurs even when the total gain of the four-wave mixer is unity, thereby rendering the medium transparent. By varying the pulse width, we observe a transition between fast and slow li"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.01541","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"2026-05-18T00:16:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RJDgsqU6qXTB+A04GNNCDh1FGA2apLOLQTs69QuZf/dvg6XqURZxNRZtEesLuXaYYElH8mG/a03FcsDuriQoBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T04:40:38.642108Z"},"content_sha256":"d333616305f567ef00d3eeea05128c9069dd956360515259995068a93491babe","schema_version":"1.0","event_id":"sha256:d333616305f567ef00d3eeea05128c9069dd956360515259995068a93491babe"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MQUVCQ4UMYF4ATY35ZU6SXOW5E/bundle.json","state_url":"https://pith.science/pith/MQUVCQ4UMYF4ATY35ZU6SXOW5E/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MQUVCQ4UMYF4ATY35ZU6SXOW5E/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":"2026-06-24T04:40:38Z","links":{"resolver":"https://pith.science/pith/MQUVCQ4UMYF4ATY35ZU6SXOW5E","bundle":"https://pith.science/pith/MQUVCQ4UMYF4ATY35ZU6SXOW5E/bundle.json","state":"https://pith.science/pith/MQUVCQ4UMYF4ATY35ZU6SXOW5E/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MQUVCQ4UMYF4ATY35ZU6SXOW5E/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:MQUVCQ4UMYF4ATY35ZU6SXOW5E","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":"b21fffe77c3dbc50b6eb669bbb614836e00a1a6905587a109ea304ea8bac7d28","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-04-04T18:00:13Z","title_canon_sha256":"f2eb03045ef00d277036de3d3a7b21a6e80e1ec308b729c99cad35710603d9b7"},"schema_version":"1.0","source":{"id":"1804.01541","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.01541","created_at":"2026-05-18T00:16:24Z"},{"alias_kind":"arxiv_version","alias_value":"1804.01541v1","created_at":"2026-05-18T00:16:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.01541","created_at":"2026-05-18T00:16:24Z"},{"alias_kind":"pith_short_12","alias_value":"MQUVCQ4UMYF4","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"MQUVCQ4UMYF4ATY3","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"MQUVCQ4U","created_at":"2026-05-18T12:32:40Z"}],"graph_snapshots":[{"event_id":"sha256:d333616305f567ef00d3eeea05128c9069dd956360515259995068a93491babe","target":"graph","created_at":"2026-05-18T00:16:24Z","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"},"paper":{"abstract_excerpt":"We experimentally investigate the propagation of optical pulses through a fast-light medium with competing absorption and gain. The combination of strong absorption and optical amplification in a potassium-based four-wave mixing process results in pulse peak advancements up to $88\\%$ of the input pulse width, more than $35 \\times$ that which is achievable without competing absorption. We show that the enhancement occurs even when the total gain of the four-wave mixer is unity, thereby rendering the medium transparent. By varying the pulse width, we observe a transition between fast and slow li","authors_text":"Jon D. Swaim, Ryan T. Glasser","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-04-04T18:00:13Z","title":"Faster light with competing absorption and gain"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.01541","kind":"arxiv","version":1},"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":"sha256:0bfe4bf2ed4f7935287fd3e76b046963e35a41686693369e5a16bf615b87a7c6","target":"record","created_at":"2026-05-18T00:16:24Z","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":"b21fffe77c3dbc50b6eb669bbb614836e00a1a6905587a109ea304ea8bac7d28","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2018-04-04T18:00:13Z","title_canon_sha256":"f2eb03045ef00d277036de3d3a7b21a6e80e1ec308b729c99cad35710603d9b7"},"schema_version":"1.0","source":{"id":"1804.01541","kind":"arxiv","version":1}},"canonical_sha256":"6429514394660bc04f1bee69e95dd6e911af77fabeb7fb4a1a706222379860cb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6429514394660bc04f1bee69e95dd6e911af77fabeb7fb4a1a706222379860cb","first_computed_at":"2026-05-18T00:16:24.911915Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:16:24.911915Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mRJs2O/jMnM5rgRBIzjUuougUqY/2U7JSLaakki8zA8VIsWJ7sYotLBgWOlRO67pPYQkaZqie2UqzRHUQ2IGAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:16:24.912525Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.01541","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0bfe4bf2ed4f7935287fd3e76b046963e35a41686693369e5a16bf615b87a7c6","sha256:d333616305f567ef00d3eeea05128c9069dd956360515259995068a93491babe"],"state_sha256":"b3b36c623c7ac6f436396d331396f3f02ff9f7eaa603de646af22d460ca6bb6e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oCYrfUZQmKh8TohhTOeGdpEa/abURyXK332x/nKox46pChAzJAtq/ntbKwyC1QKHznYW7cvfkbqPQq4aEyY5DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-24T04:40:38.644075Z","bundle_sha256":"045ab64c9a0bd04b346acd4df046e8d25728ca3ec7c0fde1c8ed1b027b7c4811"}}