{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:CT2C2YMKRIKMZY2FSSKFE4DUAJ","short_pith_number":"pith:CT2C2YMK","canonical_record":{"source":{"id":"1705.01687","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-05-04T03:23:42Z","cross_cats_sorted":[],"title_canon_sha256":"60c865245962b7f19469f33c6102c9e3ff83562bc68f8ef0bcbfc40b26aa65e5","abstract_canon_sha256":"c0231dbbbdc03ed22c25289bc207e4b547d1aa034e906b2f1c768d3609c78540"},"schema_version":"1.0"},"canonical_sha256":"14f42d618a8a14cce3459494527074027b7339ae302542a591293ce7436052a6","source":{"kind":"arxiv","id":"1705.01687","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.01687","created_at":"2026-05-18T00:30:44Z"},{"alias_kind":"arxiv_version","alias_value":"1705.01687v1","created_at":"2026-05-18T00:30:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.01687","created_at":"2026-05-18T00:30:44Z"},{"alias_kind":"pith_short_12","alias_value":"CT2C2YMKRIKM","created_at":"2026-05-18T12:31:10Z"},{"alias_kind":"pith_short_16","alias_value":"CT2C2YMKRIKMZY2F","created_at":"2026-05-18T12:31:10Z"},{"alias_kind":"pith_short_8","alias_value":"CT2C2YMK","created_at":"2026-05-18T12:31:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:CT2C2YMKRIKMZY2FSSKFE4DUAJ","target":"record","payload":{"canonical_record":{"source":{"id":"1705.01687","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-05-04T03:23:42Z","cross_cats_sorted":[],"title_canon_sha256":"60c865245962b7f19469f33c6102c9e3ff83562bc68f8ef0bcbfc40b26aa65e5","abstract_canon_sha256":"c0231dbbbdc03ed22c25289bc207e4b547d1aa034e906b2f1c768d3609c78540"},"schema_version":"1.0"},"canonical_sha256":"14f42d618a8a14cce3459494527074027b7339ae302542a591293ce7436052a6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:30:44.979660Z","signature_b64":"UL2+r7whz0JXk2QXBpAvKDPLlj1I3uBxhWuDnlApJGnOlDhZ9WGXuJId2JOlN5iDcES8EPQWu78uiv+X7mtMCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"14f42d618a8a14cce3459494527074027b7339ae302542a591293ce7436052a6","last_reissued_at":"2026-05-18T00:30:44.979025Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:30:44.979025Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1705.01687","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":"2026-05-18T00:30:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GoddjYu6bh0kb00X3yWmNGWRv7VsAxXsTxipmdd7TrJhjNQgpLfm+si7AzWN4nnnCyTPJaWH29gJv93d2gDoCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T03:01:42.269095Z"},"content_sha256":"63b8e89d2c78cc6a0d3c42fd5219026abe31c9bcb4685abadc0132788a41c441","schema_version":"1.0","event_id":"sha256:63b8e89d2c78cc6a0d3c42fd5219026abe31c9bcb4685abadc0132788a41c441"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:CT2C2YMKRIKMZY2FSSKFE4DUAJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Reverse isolation and backaction of the SLUG microwave amplifier","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"E. Leonard Jr., J. Kelly, John M. Martinis, R. Barends, R. McDermott, S. Zhu, T. Thorbeck","submitted_at":"2017-05-04T03:23:42Z","abstract_excerpt":"An ideal preamplifier for qubit measurement must not only provide high gain and near quantum-limited noise performance, but also isolate the delicate quantum circuit from noisy downstream measurement stages while producing negligible backaction. Here we use a Superconducting Low-inductance Undulatory Galvanometer (SLUG) microwave amplifier to read out a superconducting transmon qubit, and we characterize both reverse isolation and measurement backaction of the SLUG. For appropriate dc bias, the SLUG achieves reverse isolation that is better than that of a commercial cryogenic isolator. Moreove"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.01687","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":"2026-05-18T00:30:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3kFXhxtG04AIvuo3V3PpxgoLVrSmJi2hPT0zB8bMVFryke86W8VLo38nvFhGoU193/z7+tRlGavWmywukhnABQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T03:01:42.269855Z"},"content_sha256":"27cbb4afddabe1f6c496282abf784443f777c69043d05e5e02c9bb331f616aa0","schema_version":"1.0","event_id":"sha256:27cbb4afddabe1f6c496282abf784443f777c69043d05e5e02c9bb331f616aa0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CT2C2YMKRIKMZY2FSSKFE4DUAJ/bundle.json","state_url":"https://pith.science/pith/CT2C2YMKRIKMZY2FSSKFE4DUAJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CT2C2YMKRIKMZY2FSSKFE4DUAJ/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":"2026-05-31T03:01:42Z","links":{"resolver":"https://pith.science/pith/CT2C2YMKRIKMZY2FSSKFE4DUAJ","bundle":"https://pith.science/pith/CT2C2YMKRIKMZY2FSSKFE4DUAJ/bundle.json","state":"https://pith.science/pith/CT2C2YMKRIKMZY2FSSKFE4DUAJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CT2C2YMKRIKMZY2FSSKFE4DUAJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:CT2C2YMKRIKMZY2FSSKFE4DUAJ","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":"c0231dbbbdc03ed22c25289bc207e4b547d1aa034e906b2f1c768d3609c78540","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-05-04T03:23:42Z","title_canon_sha256":"60c865245962b7f19469f33c6102c9e3ff83562bc68f8ef0bcbfc40b26aa65e5"},"schema_version":"1.0","source":{"id":"1705.01687","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.01687","created_at":"2026-05-18T00:30:44Z"},{"alias_kind":"arxiv_version","alias_value":"1705.01687v1","created_at":"2026-05-18T00:30:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.01687","created_at":"2026-05-18T00:30:44Z"},{"alias_kind":"pith_short_12","alias_value":"CT2C2YMKRIKM","created_at":"2026-05-18T12:31:10Z"},{"alias_kind":"pith_short_16","alias_value":"CT2C2YMKRIKMZY2F","created_at":"2026-05-18T12:31:10Z"},{"alias_kind":"pith_short_8","alias_value":"CT2C2YMK","created_at":"2026-05-18T12:31:10Z"}],"graph_snapshots":[{"event_id":"sha256:27cbb4afddabe1f6c496282abf784443f777c69043d05e5e02c9bb331f616aa0","target":"graph","created_at":"2026-05-18T00:30:44Z","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":"An ideal preamplifier for qubit measurement must not only provide high gain and near quantum-limited noise performance, but also isolate the delicate quantum circuit from noisy downstream measurement stages while producing negligible backaction. Here we use a Superconducting Low-inductance Undulatory Galvanometer (SLUG) microwave amplifier to read out a superconducting transmon qubit, and we characterize both reverse isolation and measurement backaction of the SLUG. For appropriate dc bias, the SLUG achieves reverse isolation that is better than that of a commercial cryogenic isolator. Moreove","authors_text":"E. Leonard Jr., J. Kelly, John M. Martinis, R. Barends, R. McDermott, S. Zhu, T. Thorbeck","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-05-04T03:23:42Z","title":"Reverse isolation and backaction of the SLUG microwave amplifier"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.01687","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":"sha256:63b8e89d2c78cc6a0d3c42fd5219026abe31c9bcb4685abadc0132788a41c441","target":"record","created_at":"2026-05-18T00:30:44Z","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":"c0231dbbbdc03ed22c25289bc207e4b547d1aa034e906b2f1c768d3609c78540","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-05-04T03:23:42Z","title_canon_sha256":"60c865245962b7f19469f33c6102c9e3ff83562bc68f8ef0bcbfc40b26aa65e5"},"schema_version":"1.0","source":{"id":"1705.01687","kind":"arxiv","version":1}},"canonical_sha256":"14f42d618a8a14cce3459494527074027b7339ae302542a591293ce7436052a6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"14f42d618a8a14cce3459494527074027b7339ae302542a591293ce7436052a6","first_computed_at":"2026-05-18T00:30:44.979025Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:30:44.979025Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UL2+r7whz0JXk2QXBpAvKDPLlj1I3uBxhWuDnlApJGnOlDhZ9WGXuJId2JOlN5iDcES8EPQWu78uiv+X7mtMCw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:30:44.979660Z","signed_message":"canonical_sha256_bytes"},"source_id":"1705.01687","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:63b8e89d2c78cc6a0d3c42fd5219026abe31c9bcb4685abadc0132788a41c441","sha256:27cbb4afddabe1f6c496282abf784443f777c69043d05e5e02c9bb331f616aa0"],"state_sha256":"777939df598473bbb4da250e59352e1e4c4718041b7db4db011a2373a6ddee9d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IJDEH7EIlIZdonpm8+Lecc5CuF/4v/D0sb45WyWyPG9E8YH4Iq1bzN9radz6u44CSCf3HT492MrX1S6GlJQdDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T03:01:42.275026Z","bundle_sha256":"c9a583d3273bdde72b250815a7381113ea725daafdad64fb1c176e986ae6f197"}}