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In this talk, I will show our recent progress with our collaborators on superconducting multi-qubits system. We designed and fabricated several versions of quantum processor, on which integrated up to t quibts. The typical T1 and T2 time are both longer than 20 micro-seconds. The fidelity of single-bit gate and two-bit CZ gate are calibrated by randomized benchmarking. For the single-bit, the fidelity is measured higher than 99.9% and for the CZ gate it reaches 99.5% in the best case. I will also show some of the multi-qubits experiment results: based only on single-qubit gates and controlled-phase gates, we generated and verified the genuine multiparticle entanglement for 12 superconducting qubits, the fidelity is higher than 70%;[1] strongly correlated quantum walks was demonstrated with a 12-qubit superconducting processor;[2] propagation and localization of collective excitations was observed on a 24-qubit superconducting processor.[3] Our results are a substantial step towards large-scale random circuit sampling and scalable measurement-based quantum computing.
[1] Phys. Rev. Lett. 122, 110501 (2019).
[2] Science 364(6442), 753-756 (2019).
[3] Phys. Rev. Lett. 123, 050502(2019).
Prof. Xiaobo Zhu received his PhD in condensed matter physics at Institute of Physics, Chinese Academy of Sciences (IOP-China), Beijing.Between 2003 and 2008, he worked in IOP-China as intern, assistant professor and associated professor. In 2008, he joined NTT Basic Research Laboratories as Research Associate and Senior Research Associate. In 2013, he became a special assigned professor in IOP-China. In 2016, he joined University of science and technology of China as professor. His team is dedicated to develop the scale-up superconducting quantum circuit and hybrid superconducting quantum system. With their collaborators, they improved the two-qubit gate fidelity to 99.8%, demonstrated 10-qubit, 12-qubit entanglement, and developed a 24-qubit system. Next, they will further increase the qubit number and quality of system, and will keep trying to make breakthrough on error correction and near-term application.
Venue: TDLI Meeting Room 200
Here is the Zoom link if you prefer to join us remotely:
https://zoom.com.cn/j/91777295793
Password: 270540