Measured
Runs
58
Unread
3
Machines
5
Latest run
2026-09-24
On IBM Kingston, qubits 0-1 read 67-74% on 9 runs from 2026-09-22 to 2026-09-24, while qubits 42-43 of the same chip, run alternately with them on 2026-09-23 and 2026-09-24, read 98-99% on 5 runs.
Bell circuit% shots on 00 or 11MEASURED
Mirror circuits% right answer, by depthMEASURED
Published vs. measured
Withheld
Emerald · IQM · 4 runs — one run belongs to another account and the rest cannot be separated from it yet.
Cepheus-1-108Q · Rigetti · 5 runs — one run belongs to another account and the rest cannot be separated from it yet.
+ Every run, as tables
The circuit
OPENQASM 2.0; include "qelib1.inc"; qreg q[2]; creg meas[2]; h q[0]; cx q[0],q[1]; barrier q[0],q[1]; measure q[0] -> meas[0]; measure q[1] -> meas[1];
An ideal device returns only |00⟩ or |11⟩.
| Machine | Runs | Shots each | In 00 or 11, per run | Median |
|---|---|---|---|---|
| IBM KingstonIBM qubits not recorded | 2 | 512 | 97.996.7 | 97.3 |
| IBM KingstonIBM qubits 0 and 1 | 9 | 512 | 68.971.770.572.971.374.473.867.468.4 | 71.3 |
| IBM KingstonIBM qubits 42 and 43 | 5 | 512 | 98.898.499.098.898.8 | 98.8 |
| IBM FezIBM qubits not recorded | 10 | 512, 1024 | 88.587.585.788.185.989.386.789.386.783.4 | 87.1 |
| IBM FezIBM qubits 0 and 1 | 3 | 512 | 93.293.692.4 | 93.2 |
| GarnetIQM qubits not recorded | 6 +1 | 10, 128 | 93.896.990.693.894.599.210 shots, no reading | 94.1 |
| IBM MarrakeshIBM qubits not recorded | 1 | 1024 | 97.4 | 97.4 |
| IBM MarrakeshIBM qubits 0 and 1 | 3 | 512 | 98.497.397.7 | 97.7 |
| IBEX Q1AQT qubits not recorded | 0 +2 | 1 | 1 shot, no reading1 shot, no reading | none |
| Circuit | IBM Fez | IBM Kingston | IBM Marrakesh |
|---|---|---|---|
| 2 qubits, 2 layers | 89.3 | 39.1 | 99.2 |
| 2 qubits, 8 layers | 87.3 | 48.0 | 93.4 |
| 2 qubits, 32 layers | 70.5 | 40.2 | 84.6 |
| 4 qubits, 2 layers | 80.7 | 53.1 | 92.0 |
| 4 qubits, 8 layers | 67.6 | 36.1 | 79.5 |
| 4 qubits, 32 layers | 29.7 | 39.5 | 37.1 |