{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:4VXOH3U7IJRVVL5D2TPSL77HVY","short_pith_number":"pith:4VXOH3U7","canonical_record":{"source":{"id":"2102.11373","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-02-22T21:41:22Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"9ebc93a84dd57659aabf2870ba15922f644ae895855eda5ba895c4d19cc22e87","abstract_canon_sha256":"0f84eee88a3b74270b4fcc003c9443ccf04d78d2772fe944fd7f1cfac6fe095a"},"schema_version":"1.0"},"canonical_sha256":"e56ee3ee9f42635aafa3d4df25ffe7ae05a4a0a81cb1857130826065900d3d4e","source":{"kind":"arxiv","id":"2102.11373","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.11373","created_at":"2026-07-05T03:19:05Z"},{"alias_kind":"arxiv_version","alias_value":"2102.11373v1","created_at":"2026-07-05T03:19:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.11373","created_at":"2026-07-05T03:19:05Z"},{"alias_kind":"pith_short_12","alias_value":"4VXOH3U7IJRV","created_at":"2026-07-05T03:19:05Z"},{"alias_kind":"pith_short_16","alias_value":"4VXOH3U7IJRVVL5D","created_at":"2026-07-05T03:19:05Z"},{"alias_kind":"pith_short_8","alias_value":"4VXOH3U7","created_at":"2026-07-05T03:19:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:4VXOH3U7IJRVVL5D2TPSL77HVY","target":"record","payload":{"canonical_record":{"source":{"id":"2102.11373","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-02-22T21:41:22Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"9ebc93a84dd57659aabf2870ba15922f644ae895855eda5ba895c4d19cc22e87","abstract_canon_sha256":"0f84eee88a3b74270b4fcc003c9443ccf04d78d2772fe944fd7f1cfac6fe095a"},"schema_version":"1.0"},"canonical_sha256":"e56ee3ee9f42635aafa3d4df25ffe7ae05a4a0a81cb1857130826065900d3d4e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:19:05.726117Z","signature_b64":"N9P1LiUqn4YH62gamWjijCatKn2xiGdrDlvVz2e8x61/FG83E/UOuxP4C+u5sLa5SsGBgTWm+4XdVUyauvLqCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e56ee3ee9f42635aafa3d4df25ffe7ae05a4a0a81cb1857130826065900d3d4e","last_reissued_at":"2026-07-05T03:19:05.725619Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:19:05.725619Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2102.11373","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":"2026-07-05T03:19:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SuHt5XOdcyW7s5NBMSWrsiVyAUK5uyZLiWEWM8CD0gYBrNovhWSxXDlVoMl4OnbnYbvqUEaviHcgfLC2BcUkCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T00:50:43.871083Z"},"content_sha256":"525b1a388a666593e221e0b29955339c57a416782aa7119afb368b24c7392aef","schema_version":"1.0","event_id":"sha256:525b1a388a666593e221e0b29955339c57a416782aa7119afb368b24c7392aef"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:4VXOH3U7IJRVVL5D2TPSL77HVY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum sensing of photonic spin density","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"quant-ph","authors_text":"Farid Kalhor, Leif Bauer, Li-Ping Yang, Zubin Jacob","submitted_at":"2021-02-22T21:41:22Z","abstract_excerpt":"Photonic spin density (PSD) in the near-field gives rise to exotic phenomena such as photonic skyrmions, optical spin-momentum locking and unidirectional topological edge waves. Experimental investigation of these phenomena requires a nanoscale probe that directly interacts with PSD. Here, we propose and demonstrate that the nitrogen-vacancy (NV) center in diamond can be used as a quantum sensor for detecting the spinning nature of photons. This room temperature magnetometer can measure the local polarization of light in ultra-subwavelength volumes through photon-spin-induced virtual transitio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.11373","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2102.11373/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":"2026-07-05T03:19:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hxmicfGXXEli9yDntymxdmDP0sPbvTCjw2BfXLJRJVzzMJhVlvA73hip5yHmdQujyy//rSicGEF/85oV7eLpCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T00:50:43.871606Z"},"content_sha256":"0e13e9c2fdc7afe3a0d1d6737bc6b128855464d778ad5195cf2b59ab19beb057","schema_version":"1.0","event_id":"sha256:0e13e9c2fdc7afe3a0d1d6737bc6b128855464d778ad5195cf2b59ab19beb057"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4VXOH3U7IJRVVL5D2TPSL77HVY/bundle.json","state_url":"https://pith.science/pith/4VXOH3U7IJRVVL5D2TPSL77HVY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4VXOH3U7IJRVVL5D2TPSL77HVY/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":"2026-08-05T00:50:43Z","links":{"resolver":"https://pith.science/pith/4VXOH3U7IJRVVL5D2TPSL77HVY","bundle":"https://pith.science/pith/4VXOH3U7IJRVVL5D2TPSL77HVY/bundle.json","state":"https://pith.science/pith/4VXOH3U7IJRVVL5D2TPSL77HVY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4VXOH3U7IJRVVL5D2TPSL77HVY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:4VXOH3U7IJRVVL5D2TPSL77HVY","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":"0f84eee88a3b74270b4fcc003c9443ccf04d78d2772fe944fd7f1cfac6fe095a","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-02-22T21:41:22Z","title_canon_sha256":"9ebc93a84dd57659aabf2870ba15922f644ae895855eda5ba895c4d19cc22e87"},"schema_version":"1.0","source":{"id":"2102.11373","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.11373","created_at":"2026-07-05T03:19:05Z"},{"alias_kind":"arxiv_version","alias_value":"2102.11373v1","created_at":"2026-07-05T03:19:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.11373","created_at":"2026-07-05T03:19:05Z"},{"alias_kind":"pith_short_12","alias_value":"4VXOH3U7IJRV","created_at":"2026-07-05T03:19:05Z"},{"alias_kind":"pith_short_16","alias_value":"4VXOH3U7IJRVVL5D","created_at":"2026-07-05T03:19:05Z"},{"alias_kind":"pith_short_8","alias_value":"4VXOH3U7","created_at":"2026-07-05T03:19:05Z"}],"graph_snapshots":[{"event_id":"sha256:0e13e9c2fdc7afe3a0d1d6737bc6b128855464d778ad5195cf2b59ab19beb057","target":"graph","created_at":"2026-07-05T03:19:05Z","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/2102.11373/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Photonic spin density (PSD) in the near-field gives rise to exotic phenomena such as photonic skyrmions, optical spin-momentum locking and unidirectional topological edge waves. Experimental investigation of these phenomena requires a nanoscale probe that directly interacts with PSD. Here, we propose and demonstrate that the nitrogen-vacancy (NV) center in diamond can be used as a quantum sensor for detecting the spinning nature of photons. This room temperature magnetometer can measure the local polarization of light in ultra-subwavelength volumes through photon-spin-induced virtual transitio","authors_text":"Farid Kalhor, Leif Bauer, Li-Ping Yang, Zubin Jacob","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-02-22T21:41:22Z","title":"Quantum sensing of photonic spin density"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.11373","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":"sha256:525b1a388a666593e221e0b29955339c57a416782aa7119afb368b24c7392aef","target":"record","created_at":"2026-07-05T03:19:05Z","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":"0f84eee88a3b74270b4fcc003c9443ccf04d78d2772fe944fd7f1cfac6fe095a","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2021-02-22T21:41:22Z","title_canon_sha256":"9ebc93a84dd57659aabf2870ba15922f644ae895855eda5ba895c4d19cc22e87"},"schema_version":"1.0","source":{"id":"2102.11373","kind":"arxiv","version":1}},"canonical_sha256":"e56ee3ee9f42635aafa3d4df25ffe7ae05a4a0a81cb1857130826065900d3d4e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e56ee3ee9f42635aafa3d4df25ffe7ae05a4a0a81cb1857130826065900d3d4e","first_computed_at":"2026-07-05T03:19:05.725619Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:19:05.725619Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"N9P1LiUqn4YH62gamWjijCatKn2xiGdrDlvVz2e8x61/FG83E/UOuxP4C+u5sLa5SsGBgTWm+4XdVUyauvLqCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:19:05.726117Z","signed_message":"canonical_sha256_bytes"},"source_id":"2102.11373","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:525b1a388a666593e221e0b29955339c57a416782aa7119afb368b24c7392aef","sha256:0e13e9c2fdc7afe3a0d1d6737bc6b128855464d778ad5195cf2b59ab19beb057"],"state_sha256":"11ce073df34867edb4c15615cebe3112d96f092a83b8b8ddcd9ed26b7bc98662"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qw5kwDUFDIjqaF4eVTH1WNXDiE5UPM2qSIyW7N1KqaP9Z7QOw7sK9mVC+R8Zc7lIVjxciE1UgAFhy1XpxmYHCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T00:50:43.875640Z","bundle_sha256":"568dc423e0b33a3f2ad034a4e0fdfa327b765ab84a82f26973b2193c5f4e2a4f"}}