{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:URKEU22FQULZ2EHHPKDKXTAL6E","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":"29e63639d679c051af2877e2df35f74318e071ea55ec089be4bfdbef5eee36da","cross_cats_sorted":["physics.atom-ph","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-07-15T11:57:15Z","title_canon_sha256":"3496140e81d83604abbf5a10a40441e85ef31bbb15bfd4d36290b28ef15f576b"},"schema_version":"1.0","source":{"id":"2107.07272","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2107.07272","created_at":"2026-07-05T04:38:34Z"},{"alias_kind":"arxiv_version","alias_value":"2107.07272v1","created_at":"2026-07-05T04:38:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2107.07272","created_at":"2026-07-05T04:38:34Z"},{"alias_kind":"pith_short_12","alias_value":"URKEU22FQULZ","created_at":"2026-07-05T04:38:34Z"},{"alias_kind":"pith_short_16","alias_value":"URKEU22FQULZ2EHH","created_at":"2026-07-05T04:38:34Z"},{"alias_kind":"pith_short_8","alias_value":"URKEU22F","created_at":"2026-07-05T04:38:34Z"}],"graph_snapshots":[{"event_id":"sha256:a71ea3ec5aae60c16a8d2bff353fd27b9b71990aea2844ea0610be32cc3016e6","target":"graph","created_at":"2026-07-05T04:38:34Z","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/2107.07272/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In a non-reciprocal optical amplifier, gain depends on whether the light propagates forwards or backwards through the device. Typically, one requires either the magneto-optical effect, a temporal modulation, or an optical nonlinearity to break reciprocity. By contrast, here, we demonstrate non-reciprocal amplification of fibre-guided light using Raman gain provided by spin-polarized atoms that are coupled to the nanofibre waist of a tapered fibre section. The non-reciprocal response originates from the propagation direction-dependent local polarization of the nanofibre-guided mode in conjuncti","authors_text":"Arno Rauschenbeutel, Christian Liedl, Philipp Schneeweiss, Sebastian Pucher, Shuwei Jin","cross_cats":["physics.atom-ph","physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-07-15T11:57:15Z","title":"Atomic spin-controlled non-reciprocal Raman amplification of fibre-guided light"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2107.07272","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:a1277d247c70c422940f7b02afd929fdc937688d869a80d881701a8e20352fee","target":"record","created_at":"2026-07-05T04:38:34Z","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":"29e63639d679c051af2877e2df35f74318e071ea55ec089be4bfdbef5eee36da","cross_cats_sorted":["physics.atom-ph","physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-07-15T11:57:15Z","title_canon_sha256":"3496140e81d83604abbf5a10a40441e85ef31bbb15bfd4d36290b28ef15f576b"},"schema_version":"1.0","source":{"id":"2107.07272","kind":"arxiv","version":1}},"canonical_sha256":"a4544a6b4585179d10e77a86abcc0bf1169fa54a896da1a6ec9af2132960d4f0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a4544a6b4585179d10e77a86abcc0bf1169fa54a896da1a6ec9af2132960d4f0","first_computed_at":"2026-07-05T04:38:34.019157Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:38:34.019157Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SS4U9Xy7L83MhAC6YRzS0e6OJpWNKMRxDWc8uWbgZfCnd2w49XeBY/Xr5rdUzCuCOD6ML5QsW4wv48HVNWNsAA==","signature_status":"signed_v1","signed_at":"2026-07-05T04:38:34.019648Z","signed_message":"canonical_sha256_bytes"},"source_id":"2107.07272","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a1277d247c70c422940f7b02afd929fdc937688d869a80d881701a8e20352fee","sha256:a71ea3ec5aae60c16a8d2bff353fd27b9b71990aea2844ea0610be32cc3016e6"],"state_sha256":"a91ab360e944cc5ba8aa7f78b0275aadfb8d7164be8794c332be42ea0891c26d"}