IBM ibm_prague

IBM · Apache-2.0 last capture 2023-01-12

ibm_prague is a 33-qubit IBM quantum computer.

On its latest calibration (12 January 2023), a typical two-qubit operation failed about 1 in 320, better than 91% of the 65 other devices in this record.

The newest record is from 12 January 2023, so the machine may since have been upgraded or retired.

Every figure below is the device's latest measurement of that metric, with its own date and source. See how the whole field is progressing →

Best 2Q fidelity
IBM · Apache-2.0
0.998547
fails about 1 in 690

Success rate of the chip's single best pair of qubits. The best pair flatters the chip; the typical one matters more.

Better than 89% of 65 other devices with this measurement
Measured 2023-01-12
Median 2Q error
IBM · Apache-2.0
0.00316161
fails about 1 in 320

How often a typical two-qubit operation on this chip fails, from the vendor's own calibration.

Better than 91% of 65 other devices with this measurement
Measured 2023-01-12
Median T1 (µs)
IBM · Apache-2.0
144.53

How long a typical qubit holds its state before it decays, in microseconds. Longer leaves more time to compute.

Better than 66% of 67 other devices with this measurement
Measured 2023-01-12
Median T2 (µs)
IBM · Apache-2.0
117.86

How long a typical qubit keeps its delicate quantum phase, in microseconds.

Better than 69% of 67 other devices with this measurement
Measured 2023-01-12
Median readout error
IBM · Apache-2.0
0.0109
fails about 1 in 92

How often reading a typical qubit's value at the end gives the wrong answer.

Better than 84% of 67 other devices with this measurement
Measured 2023-01-12
Qubits
IBM · Apache-2.0
33

Physical qubits on the device. More only helps if they are good enough to use together.

Measured 2023-01-12

History

1 snapshot so far. A trend appears here once a metric has been measured on two different days.

Provenance

Source
IBM · Apache-2.0
Licence
Apache-2.0 · Qiskit fake backend calibration snapshot
Raw redistributable
yes
Captured
2023-01-12T06:55:57
Raw source (latest snapshot)
https://github.com/Qiskit/qiskit-ibm-runtime/blob/2a396172c25aa2971e99b434b430177745878a53/qiskit_ibm_runtime/fake_provider/backends/prague/props_prague.json

Cite this page

@misc{provenova_ibm_ibm_prague,
  title        = {IBM ibm_prague — calibration & benchmark history},
  howpublished = {\url{https://provenova.net/hardware/ibm/ibm_prague}},
  publisher    = {Provenova},
  note         = {accessed 2026-10-20}
}

Compare with

vs ibm ibm_aachen 5 shared metrics vs ibm ibm_algiers 5 shared metrics vs ibm ibm_auckland 5 shared metrics vs ibm ibm_berlin 5 shared metrics vs ibm ibm_boston 5 shared metrics vs ibm ibm_brisbane 5 shared metrics vs ibm ibm_brussels 5 shared metrics vs ibm ibm_cairo 5 shared metrics

Data: real IBM device calibration published in Qiskit's fake backends (Apache-2.0). Rankings on the live leaderboard.