Fighting readout noise on quantum devices

Cykl wykładów z informatyki kwantowej
Filip
Maciejewski
April 6, 2020 6:00 PM

We invite you to the next meeting of the Warsaw Quantum Computing Group, 6.04 at 18:00! This time, due to the COVID-19 outbreak, we will have a virtual meeting with remote only access (we will send the details to the registered people later). The talk Fighting readout noise on quantum devices will be given by Filip Maciejewski. The number of seats is limited, so please register as soon as possible (no later than 5.04, EOD) using the form: https://docs.google.com/forms/d/e/1FAIpQLSeGb9bKgR1J9jNDCFVd1AQyR4SEWxHgedseosKGsEoWbbqLiw/viewform Abstract: Most people agree that quantum computing, if ever actually developed, could offer major advances in virtually all areas of scientific research. Yet, technology is currently in its infancy, and state of the art machines suffer from a lot of problems. One of the most important obstacles we need to overcome is noise affecting the qubits. In this context, an important task arises of developing methods to mitigate the noise. In this talk, I will focus on this task for the noise affecting quantum measurements. I will start by showing how to model noisy measurements using a standard formalism of quantum mechanics. I will explain under what assumptions it is possible to reverse the effects of measurement noise by classical post-processing (on the standard computer) of the experimental data. Then I will explain what are the effects of deviations from those assumptions for the mitigation procedure. Finally, I will present the results of experiments performed on IBM’s quantum device, including detector characterization and successful implementation of the mitigation procedure for experiments on up to 5 qubits. The talk will be based mostly on the paper: arxiv:1907.08518 I also encourage you to check out a new GitHub repository we just started developing (all is in Python): https://github.com/fbm2718/QREM. Bio: Filip did a BSc in Nanotechnology at the Faculty of Chemistry and Faculty of Physics of the University of Warsaw (UW). After 3 years of exciting experimental studies, he decided that it’s time to go for theory. He joined the group of Michał Oszmaniec (quantin.pl) and went for MSc in theoretical physics at the Faculty of Physics UW. During his master’s studies, he was involved in a variety of projects in the National Quantum Information Center (KCIK) in Sopot and International Centre for Theory of Quantum Technologies (ICTQT) in Gdańsk. After defending the thesis in the last year, he started a PhD in the same group, becoming a student at the Centre for Theoretical Physics, Polish Academy of Sciences. His research focuses mostly on the theory of quantum measurements, characterization of noise in quantum devices, and developing methods to mitigate it. You can find the details on the event's website: https://www.facebook.com/events/660479084522906. The meeting is organized by the Quantum AI Foundation with support of Daftcode - our strategic partner. We hope to see you soon! Warsaw Quantum Computing Group P.S.1 Let’s stay in touch on our Facebook group: https://www.facebook.com/groups/285214992075232 P.S.2 You can also join our mailing list at Google Groups: https://groups.google.com/forum/#!forum/warsaw-quantum-computing-group P.S.3 You can also follow our fanpage https://www.facebook.com/Warsaw-Quantum-Computing-Group-1936160966506139 and YouTube channel https://www.youtube.com/channel/UCoQAyPU5KQEpMOMDUN0j3IQ/videos.