If I download calibration of a quantum processor on IBM Q website I see these parameters:

  • T1
  • T2
  • frequency (GHz)
  • readout error
  • single qubit U2 error rate
  • CNOT error rate

T1 and T2 are relaxation and dephasing times, respectively.

What are the other parameters?

  • frequency (GHz): The frequency(energy) associated with the transition between the qubit's ground state ($|0\rangle$) and first excited state ($|1\rangle$).
  • readout error: The probability of preparing a $|0\rangle$($|1\rangle$) and measuring a $|1\rangle$($|0\rangle$), ie., of having an error in your readout
  • single qubit U2 error rate: The average error per gate of a single qubit gate, this is $1 - \mathrm{average\_gate\_fidelity}$.
  • CNOT error rate: The average error per gate of a two-qubit gate.
| improve this answer | |
  • $\begingroup$ Thanks for the answer. What do you mean by average error? Is it an average readout error? Or a probability that a gate will operate in wrong way? Lastly, I am a little bit lost in frequency - is it a frequency of photon that cause excitation from ground state to excited one? $\endgroup$ – Martin Vesely Mar 4 at 14:38
  • $\begingroup$ - Average gate fidelity specifically means arxiv.org/abs/quant-ph/0205035 - Yes, this is one way of thinking of the frequency but fundamentally it is related to the energy levels of the quantum system en.wikipedia.org/wiki/Energy_level $\endgroup$ – user47787 Mar 5 at 15:04

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.