IBM ibmq_london
IBM · Apache-2.0 last capture 2020-08-10ibmq_london is a 5-qubit IBM quantum computer.
On its latest calibration (10 August 2020), a typical two-qubit operation failed about 1 in 92, better than 37% of the 65 other devices in this record.
The newest record is from 10 August 2020, 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 →
Success rate of the chip's single best pair of qubits. The best pair flatters the chip; the typical one matters more.
How often a typical two-qubit operation on this chip fails, from the vendor's own calibration.
How long a typical qubit holds its state before it decays, in microseconds. Longer leaves more time to compute.
How long a typical qubit keeps its delicate quantum phase, in microseconds.
How often reading a typical qubit's value at the end gives the wrong answer.
Physical qubits on the device. More only helps if they are good enough to use together.
History
Each point is one dated measurement (5 snapshots in total).
Provenance
- Source
- IBM · Apache-2.0
- Licence
- Apache-2.0 · Qiskit fake backend calibration snapshot
- Raw redistributable
- yes
- Captured
- 2020-08-10T07:21:18
Cite this page
@misc{provenova_ibm_ibmq_london,
title = {IBM ibmq_london — calibration & benchmark history},
howpublished = {\url{https://provenova.net/hardware/ibm/ibmq_london}},
publisher = {Provenova},
note = {accessed 2026-10-19}
}
Compare with
Data: real IBM device calibration published in Qiskit's fake backends (Apache-2.0). Rankings on the live leaderboard.