IBM ibmq_20_tokyo

IBM · Apache-2.0 last capture 2019-08-29

ibmq_20_tokyo is a 20-qubit IBM quantum computer.

On its latest calibration (29 August 2019), a typical two-qubit operation failed about 1 in 33, better than 5% of the 65 other devices in this record.

The newest record is from 29 August 2019, 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
0.98349
fails about 1 in 61

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

Better than 3% of 65 other devices with this measurement
Measured 2019-08-29
Median 2Q error
IBM · Apache-2.0
0.0302751
fails about 1 in 33

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

Better than 5% of 65 other devices with this measurement
Measured 2019-08-29
Median T1 (µs)
IBM · Apache-2.0
81.644

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

Better than 25% of 67 other devices with this measurement
Measured 2019-08-29
Median T2 (µs)
IBM · Apache-2.0
55.893

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

Better than 18% of 67 other devices with this measurement
Measured 2019-08-29
Median readout error
IBM · Apache-2.0
0.0445
fails about 1 in 22

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

Better than 13% of 67 other devices with this measurement
Measured 2019-08-29
Qubits
IBM · Apache-2.0
20

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

Measured 2019-08-29

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
2019-08-29T03:57:44
Raw source (latest snapshot)
https://github.com/Qiskit/qiskit/blob/3241978340f534b76e4cf0e5e25ed16e2af5cf78/qiskit/providers/fake_provider/backends/tokyo/props_tokyo.json

Cite this page

@misc{provenova_ibm_ibmq_20_tokyo,
  title        = {IBM ibmq_20_tokyo — calibration & benchmark history},
  howpublished = {\url{https://provenova.net/hardware/ibm/ibmq_20_tokyo}},
  publisher    = {Provenova},
  note         = {accessed 2026-10-19}
}

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.