{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:2QZVT5K2SYY4HQ4GZLEFCVOAIF","short_pith_number":"pith:2QZVT5K2","canonical_record":{"source":{"id":"1604.08288","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-04-28T02:23:10Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"fef80eba40b4f7cdd97472d92d353407b523f917a196c33eaf000f1527ebd3f0","abstract_canon_sha256":"75e26851e835432ff2ff63ad19645fbbdd4846771d60438f1af516d7bfdf0d78"},"schema_version":"1.0"},"canonical_sha256":"d43359f55a9631c3c386cac85155c04164cdd1965a990bf0ae54f824de85fe1e","source":{"kind":"arxiv","id":"1604.08288","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.08288","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"arxiv_version","alias_value":"1604.08288v1","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.08288","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"pith_short_12","alias_value":"2QZVT5K2SYY4","created_at":"2026-05-18T12:29:55Z"},{"alias_kind":"pith_short_16","alias_value":"2QZVT5K2SYY4HQ4G","created_at":"2026-05-18T12:29:55Z"},{"alias_kind":"pith_short_8","alias_value":"2QZVT5K2","created_at":"2026-05-18T12:29:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:2QZVT5K2SYY4HQ4GZLEFCVOAIF","target":"record","payload":{"canonical_record":{"source":{"id":"1604.08288","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-04-28T02:23:10Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"fef80eba40b4f7cdd97472d92d353407b523f917a196c33eaf000f1527ebd3f0","abstract_canon_sha256":"75e26851e835432ff2ff63ad19645fbbdd4846771d60438f1af516d7bfdf0d78"},"schema_version":"1.0"},"canonical_sha256":"d43359f55a9631c3c386cac85155c04164cdd1965a990bf0ae54f824de85fe1e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:15:31.828668Z","signature_b64":"wa7B1rNNgOFSDF1Mu2CN7sl3jdwJQyEPPiL8P+unP/yyUvy2KaKOf4SaLco0uhwQoxwXsi02tP+d1XLuqMtKCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d43359f55a9631c3c386cac85155c04164cdd1965a990bf0ae54f824de85fe1e","last_reissued_at":"2026-05-18T01:15:31.828060Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:15:31.828060Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1604.08288","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":"2026-05-18T01:15:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cy5VQ4Il6qVScxjeK3bAkWEqqRTtQ+FKUkEsmjVRSuwc73wP9s6nidz4K9id50SnTizlSd61gAIXgCIw2+aiDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T14:29:02.541251Z"},"content_sha256":"a0a0b30c6cf47c3064d8a1e91db7a24eb5626916d2db4528dc60cd5834993cb4","schema_version":"1.0","event_id":"sha256:a0a0b30c6cf47c3064d8a1e91db7a24eb5626916d2db4528dc60cd5834993cb4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:2QZVT5K2SYY4HQ4GZLEFCVOAIF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Large-scale Ising spin network based on degenerate optical parametric oscillators","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"physics.optics","authors_text":"Hiroki Takesue, Kensuke Inaba, Kyo Inoue, Ryan Hamerly, Takahiro Inagaki, Yoshihisa Yamamoto","submitted_at":"2016-04-28T02:23:10Z","abstract_excerpt":"Simulating a network of Ising spins with physical systems is now emerging as a promising approach for solving mathematically intractable problems. Here we report a large-scale network of artificial spins based on degenerate optical parametric oscillators (DOPO), paving the way towards a photonic Ising machine capable of solving difficult combinatorial optimization problems. We generated >10,000 time-division-multiplexed DOPOs using dual-pump four-wave mixing (FWM) in a highly nonlinear fibre (HNLF) placed in a fibre cavity. Using those DOPOs, a one-dimensional (1D) Ising model was simulated by"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.08288","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":"2026-05-18T01:15:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oGsTletExq8L8OZXusycHelTnuTxBaPicezmQVG0RVvnfmGCXUJOXC7cFvO8qFmgPohiC+BhhGNXSytTZnnEDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T14:29:02.541615Z"},"content_sha256":"5f98d29d65847fdcfbc0b3458bd1ea83214830c1bb8b0aa7c9ce0bb5b7c2c11c","schema_version":"1.0","event_id":"sha256:5f98d29d65847fdcfbc0b3458bd1ea83214830c1bb8b0aa7c9ce0bb5b7c2c11c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2QZVT5K2SYY4HQ4GZLEFCVOAIF/bundle.json","state_url":"https://pith.science/pith/2QZVT5K2SYY4HQ4GZLEFCVOAIF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2QZVT5K2SYY4HQ4GZLEFCVOAIF/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":"2026-06-03T14:29:02Z","links":{"resolver":"https://pith.science/pith/2QZVT5K2SYY4HQ4GZLEFCVOAIF","bundle":"https://pith.science/pith/2QZVT5K2SYY4HQ4GZLEFCVOAIF/bundle.json","state":"https://pith.science/pith/2QZVT5K2SYY4HQ4GZLEFCVOAIF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2QZVT5K2SYY4HQ4GZLEFCVOAIF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:2QZVT5K2SYY4HQ4GZLEFCVOAIF","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":"75e26851e835432ff2ff63ad19645fbbdd4846771d60438f1af516d7bfdf0d78","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-04-28T02:23:10Z","title_canon_sha256":"fef80eba40b4f7cdd97472d92d353407b523f917a196c33eaf000f1527ebd3f0"},"schema_version":"1.0","source":{"id":"1604.08288","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.08288","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"arxiv_version","alias_value":"1604.08288v1","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.08288","created_at":"2026-05-18T01:15:31Z"},{"alias_kind":"pith_short_12","alias_value":"2QZVT5K2SYY4","created_at":"2026-05-18T12:29:55Z"},{"alias_kind":"pith_short_16","alias_value":"2QZVT5K2SYY4HQ4G","created_at":"2026-05-18T12:29:55Z"},{"alias_kind":"pith_short_8","alias_value":"2QZVT5K2","created_at":"2026-05-18T12:29:55Z"}],"graph_snapshots":[{"event_id":"sha256:5f98d29d65847fdcfbc0b3458bd1ea83214830c1bb8b0aa7c9ce0bb5b7c2c11c","target":"graph","created_at":"2026-05-18T01:15:31Z","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":"Simulating a network of Ising spins with physical systems is now emerging as a promising approach for solving mathematically intractable problems. Here we report a large-scale network of artificial spins based on degenerate optical parametric oscillators (DOPO), paving the way towards a photonic Ising machine capable of solving difficult combinatorial optimization problems. We generated >10,000 time-division-multiplexed DOPOs using dual-pump four-wave mixing (FWM) in a highly nonlinear fibre (HNLF) placed in a fibre cavity. Using those DOPOs, a one-dimensional (1D) Ising model was simulated by","authors_text":"Hiroki Takesue, Kensuke Inaba, Kyo Inoue, Ryan Hamerly, Takahiro Inagaki, Yoshihisa Yamamoto","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-04-28T02:23:10Z","title":"Large-scale Ising spin network based on degenerate optical parametric oscillators"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.08288","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:a0a0b30c6cf47c3064d8a1e91db7a24eb5626916d2db4528dc60cd5834993cb4","target":"record","created_at":"2026-05-18T01:15:31Z","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":"75e26851e835432ff2ff63ad19645fbbdd4846771d60438f1af516d7bfdf0d78","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2016-04-28T02:23:10Z","title_canon_sha256":"fef80eba40b4f7cdd97472d92d353407b523f917a196c33eaf000f1527ebd3f0"},"schema_version":"1.0","source":{"id":"1604.08288","kind":"arxiv","version":1}},"canonical_sha256":"d43359f55a9631c3c386cac85155c04164cdd1965a990bf0ae54f824de85fe1e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d43359f55a9631c3c386cac85155c04164cdd1965a990bf0ae54f824de85fe1e","first_computed_at":"2026-05-18T01:15:31.828060Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:15:31.828060Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wa7B1rNNgOFSDF1Mu2CN7sl3jdwJQyEPPiL8P+unP/yyUvy2KaKOf4SaLco0uhwQoxwXsi02tP+d1XLuqMtKCg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:15:31.828668Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.08288","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a0a0b30c6cf47c3064d8a1e91db7a24eb5626916d2db4528dc60cd5834993cb4","sha256:5f98d29d65847fdcfbc0b3458bd1ea83214830c1bb8b0aa7c9ce0bb5b7c2c11c"],"state_sha256":"f2100cb2d0a9024453d0c25ed6569f77c3bda3a7fef4ef3ca12d9e06a4a7011e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"prnwwhqXUfP2YcvHD0mtcUOpmogylSjWtyvXNexGvyz/0o4hL6hAOyj96WenWKQGPza/qY6ceGFqYll9OodGDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T14:29:02.543729Z","bundle_sha256":"fd226acba8f442d724d907cf3ba673593f05e980426e5df02c783e2ebf16a0b4"}}