ibm_fez: sampling alone, two 4096-shot measurements of the same qubits, median per-qubit change 8.8 % ibm_kingston: sampling alone, two 4096-shot measurements of the same qubits, median per-qubit change 9.8 % ibm_marrakesh: sampling alone, two 4096-shot measurements of the same qubits, median per-qubit change 7.6 % ibm_fez (record 2026-10-22 19:55): sampling alone at the record's real shot count, two 4096-shot measurements, median per-qubit change 8.8 % ibm_kingston (record 2026-10-22 20:00): sampling alone at the record's real shot count, two 4096-shot measurements, median per-qubit change 9.8 % ibm_marrakesh (record 2026-10-22 19:23): sampling alone at the record's real shot count, two 1024-shot measurements, median per-qubit change 15.1 % pair (readout_error dates) n old/new observed null median null p97.5 ratio ibm_fez 2026-09-26 16:24 -> 2026-09-27 16:30 24.1 h 4096/4096 26.9 % 9.7 % 11.3 % 2.8x above p97.5 ibm_fez 2026-09-27 16:30 -> 2026-09-28 19:16 26.8 h 4096/4096 24.4 % 9.4 % 11.3 % 2.6x above p97.5 ibm_fez 2026-09-28 19:16 -> 2026-09-29 07:26 12.2 h 4096/4096 23.5 % 9.6 % 11.5 % 2.5x above p97.5 ibm_fez 2026-09-29 07:26 -> 2026-10-21 16:41 537.3 h 4096/4096 31.3 % 9.3 % 11.0 % 3.4x above p97.5 ibm_fez 2026-10-21 16:41 -> 2026-10-22 06:09 13.5 h 4096/4096 20.4 % 8.8 % 10.5 % 2.3x above p97.5 ibm_fez 2026-10-22 06:09 -> 2026-10-22 17:03 10.9 h 4096/4096 22.7 % 9.4 % 10.9 % 2.4x above p97.5 (not in results_record_notes.text) ibm_kingston 2026-09-26 11:37 -> 2026-09-27 08:34 21.0 h 4096/4096 25.5 % 9.6 % 11.7 % 2.7x above p97.5 ibm_kingston 2026-09-27 08:34 -> 2026-09-28 12:47 28.2 h 4096/4096 26.8 % 9.7 % 11.5 % 2.8x above p97.5 ibm_kingston 2026-09-28 12:47 -> 2026-10-21 07:07 546.3 h 4096/4096 36.5 % 9.8 % 11.8 % 3.7x above p97.5 ibm_kingston 2026-10-21 07:07 -> 2026-10-21 21:40 14.5 h 4096/4096 30.5 % 8.6 % 10.7 % 3.5x above p97.5 ibm_kingston 2026-10-21 21:40 -> 2026-10-22 02:16 4.6 h 4096/4096 18.7 % 9.5 % 11.2 % 2.0x above p97.5 ibm_kingston 2026-10-22 02:16 -> 2026-10-22 08:55 6.6 h 4096/4096 15.6 % 9.7 % 12.1 % 1.6x above p97.5 ibm_kingston 2026-10-22 08:55 -> 2026-10-22 15:36 6.7 h 4096/4096 24.2 % 9.8 % 11.5 % 2.5x above p97.5 (not in results_record_notes.text) ibm_kingston 2026-10-22 15:36 -> 2026-10-22 19:26 3.8 h 4096/4096 24.9 % 9.5 % 11.2 % 2.6x above p97.5 (not in results_record_notes.text) ibm_kingston 2026-10-22 19:26 -> 2026-10-23 02:23 7.0 h 4096/4096 22.3 % 9.6 % 11.4 % 2.3x above p97.5 (not in results_record_notes.text) ibm_kingston 2026-10-23 02:23 -> 2026-11-01 16:53 231.5 h 4096/4096 25.0 % 9.7 % 11.2 % 2.6x above p97.5 (not in results_record_notes.text) ibm_marrakesh 2026-09-26 16:47 -> 2026-09-27 17:35 24.8 h 4096/4096 36.4 % 9.2 % 10.9 % 4.0x above p97.5 ibm_marrakesh 2026-09-27 17:35 -> 2026-09-28 14:29 20.9 h 4096/4096 34.6 % 8.8 % 10.9 % 3.9x above p97.5 ibm_marrakesh 2026-09-28 14:29 -> 2026-10-21 15:48 553.3 h 4096/4096 60.4 % 9.6 % 11.7 % 6.3x above p97.5 ibm_marrakesh 2026-10-21 15:48 -> 2026-10-21 19:17 3.5 h 4096/4096 62.2 % 6.8 % 8.4 % 9.2x above p97.5 ibm_marrakesh 2026-10-21 19:17 -> 2026-10-21 21:07 1.8 h 4096/4096 49.3 % 6.7 % 8.1 % 7.3x above p97.5 ibm_marrakesh 2026-10-21 21:07 -> 2026-10-22 05:18 8.2 h 4096/4096 44.5 % 7.6 % 9.1 % 5.8x above p97.5 ibm_marrakesh 2026-10-22 05:18 -> 2026-10-22 10:44 5.4 h 4096/4096 29.2 % 6.8 % 8.4 % 4.3x above p97.5 ibm_marrakesh 2026-10-22 10:44 -> 2026-10-22 16:25 5.7 h 4096/1024 35.3 % 11.3 % 13.5 % 3.1x above p97.5 (not in results_record_notes.text) thinnest margin (all pairs above): ibm_kingston 2026-10-22 02:16 -> 2026-10-22 08:55 (6.6 h apart), observed 15.6 % against a null of 9.7 %, 1.6x