Speaker:  Adrian Ortega

                         Wigner Research Center for Physics / Universidad de Guadalajara

Date: 26 October, 2023, 4:00 pm (GMT-6)

 Auditorium Z, CUCEI. YouTube link

Abstract:

The presence of noise in quantum computers hinders their effective operation. Even though quantum error correction can theoretically remedy this problem, its practical realization is still a challenge. Testing and benchmarking noisy, intermediate-scale quantum (NISC) computers is therefore of high importance. Here, we suggest the application of the so-called quantum state matching protocol for testing purposes.  By comparing the experimentally obtained relative frequencies of success to the ideal success probability with a maximum statistical tolerance, we discriminate statistical errors from device specific ones. For the characterization of noise, we also use the fact that while the output of the ideal protocol is insensitive to the internal phase of the input state, the actual implementation may lead to deviations. We provide hints on how to understand and build a theoretical noise model that matches the real experiments.