[Joint CQSE & NCTS Special Seminar] Implementation of Quantum Gates on IBM-Quantum: pulse-level control of superconducting qubits

Title: [Joint CQSE & NCTS Special Seminar] Implementation of Quantum Gates on IBM-Quantum: pulse-level control of superconducting qubits
Speaker: Prof. Michihiko Sugawara (Keio University)
Time: 2023/11/30 (Thur.) 10:30-12:00
Place: NCTS Physics Lecture Hall, 4F, Chee-Chun Leung Cosmology Hall, NTU
Online: https://nationaltaiwanuniversity-zbh.my.webex.com/nationaltaiwanuniversity-zbh.my/j.php?MTID=mf1b474aa25caf40bca644dc61fcdc857
 

Abstract
The coherence time of transmon-based superconducting qubits has now surpassed
100 micro seconds, and the error rate for single-qubit SU(2) gates implemented with
well-calibrated π/2 and π pulses has reached 0.0001. However, the error rate of 2-qubit
gates remains around 30 times larger, compared to that of single-qubit gates. Thus,
improving the fidelity of 2-qubit gates has become an urgent priority for enhancing the
capabilities of superconducting quantum devices in the NISQ era.

This presentation introduces the implementation techniques of 1 and 2-qubit basis
gates employed by IBM Quantum's quantum devices, such as virtual Z gate and echoed
CX gate. Additionally, we present a unitary process tomography (UPT)-based
implementation of pulse-efficient SU(4) gates on cross resonance (CR)-based
superconducting quantum devices. We successfully implemented a continuous RZZ gate
as a 2-qubit basis, as an echo-free pulse schedule on the IBM Quantum device (ibm
kawasaki) and evaluated the average fidelity and gate time of various SU(4) gates to
confirm the advantages of the present method.
 
Biography
EDUCATION
B. Sc. 1988, Department of Chemistry, Faculty of Science, Tohoku University (Sendai, Japan)
M. Sc. 1990, Department of Chemistry, Faculty of Science, Tohoku University (Sendai, Japan)
Ph. D. 1993, Department of Chemistry, Faculty of Science, Tohoku University (Sendai, Japan)

WORKING EXPERIENCE
JSPS Postdoctoral Fellow, Tohoku University (Sendai, Japan), 1992-1994.
Postdoctoral Fellow, Arizona State University (Tempe, USA), June 1994 - October 1994
Postdoctoral Fellow, Institute of Atomic and Molecular Sciences, Academia Sinica (Taipei, TAIWAN), November 1994 - March 1995
Department of Chemistry, Faculty of Science and Technology, Keio University (Yokohama, Japan), Research Assistant 1995 - 2002.
Department of Chemistry, Faculty of Science and Technology, Keio University (Yokohama, Japan), Assistant Professor 2002 - 2018.
Keio Quantum Computing Center, Faculty of Science and Technology, Keio University (Yokohama, Japan), Project Associate Professor 2019 - present.

RESEARCH INTEREST / EXPERIENCE
Microwave pulse-designing for gate implementation on IBM Quantum devices.
VQE / QAOA analysis using IBM Quantum devices.
Theoretical analysis on coherent control of chemical reaction by optimal laser fields.
Numerical solution of vibrational Schrödinger equation by intelligent methods (neural network and genetic algorithm), finite-element method.
Theoretical wave packet study on pump-probe stimulated emission signals and photo- induced chemical reactions.
Theoretical studies on ultra-fast dynamics in condensed phase by the density matrix method.

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