Mingyu Kang

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portfolio

publications

Designing Filter Functions of Frequency-Modulated Pulses for High-Fidelity Two-Qubit Gates in Ion Chains

MK, Y. Wang, C. Fang, B. Zhang, O. Khosravani, J. Kim, and K.R. Brown

Physical Review Applied 19, 014014 (2023) [arXiv:2206.10850]

We derive and design filter functions of the laser pulses for two-qubit gates on trapped ions, in order to suppress the effects of time-varying fluctuations of the motional-mode frequencies. This improves the experimentally measured gate fidelity from 99.23(7)% to 99.55(7)% in a five-ion chain.

Efficient Motional-Mode Characterization for High-Fidelity Trapped-Ion Quantum Computing

MK, Q. Liang, M. Li, and Y. Nam

Quantum Science and Technology 8, 024002 (2023) [arXiv:2206.04212]

To achieve high-fidelity operations on a long ion chain, the motional-mode parameters must be efficiently characterized with high accuracy. We develop and explore physical models that accurately predict both magnitude and sign of the Lamb-Dicke parameters, as well as devise a parallelized and efficient characterization protocol.

Quantum Error Correction with Metastable States of Trapped Ions Using Erasure Conversion

MK, W.C. Campbell, and K.R. Brown

PRX Quantum 4, 020358 (2023) [arXiv:2210.15024]

Erasures, or errors with known locations, are more favorable than typical Pauli errors for quantum error correction. We suggest converting physical noise to erasures on trapped ions by using metastable atomic states as qubit states. Then we compare the error-correction performance of metastable and ground qubits under various physical constraints.

Pulse Optimization for High-Precision Motional-Mode Characterization in Trapped-Ion Quantum Computers

Q. Liang, MK, M. Li, and Y. Nam

Quantum Science and Technology 9, 035007 (2024) [arXiv:2307.15841]

Pulse optimization is not only for quantum gates; it can also be used for calibration (characterization of system parameters). Here we suggest using pulse optimization to characterize the motional-mode parameters (Lamb-Dicke parameters) of trapped ions with higher accuracy, which is necessary for achieving high-fidelity operations on a chain of many ions.

Seeking a Quantum Advantage with Trapped-Ion Quantum Simulations of Condensed-Phase Chemical Dynamics

MK, H. Nuomin, S.N. Chowdhury, J.L. Yuly, K. Sun, J. Whitlow, J. Valdiviezo, Z. Zhang, P. Zhang, D.N. Beratan, K.R. Brown,

Nature Reviews Chemistry 8, 340-358 (2024) [arXiv:2305.03156]

Analog-quantum simulation derived from tracking the evolution of trapped-ion systems holds the potential to simulate molecular quantum dynamics that is beyond the reach of classical-digital strategies. This Review explores the prospects for developing this quantum advantage.

Quantum Simulation of Spin-Boson Models with Structured Bath

K. Sun*, MK*, H. Nuomin, G. Schwartz, D.N. Beratan, K.R. Brown, and J. Kim

Nature Communications 16, 4042 (2025) [arXiv:2405.14624]

We simulate the spin-boson model, a paradigmatic model of non-Markovian open quantum systems, using the motional modes of trapped ions. The dissipative behavior of the dynamics is captured by applying randomness to the control parameters.

QUITS: A modular Qldpc code circUIT Simulator

MK*, Y. Lin*, H. Yao, M. Gökduman, A. Meinking, and K.R. Brown

Quantum 9, 1931 (2025) [arXiv:2504.02673]

QUITS is a modular and flexible circuit-level simulator for quantum low-density parity check (QLDPC) codes. QUITS supports several leading QLDPC families, including hypergraph product codes, lifted product codes, and balanced product codes. Available online.

Improved Measurement Cost Scaling in the Nonorthogonal Quantum Eigensolver

MK and K.B. Whaley

arXiv:2608.12830 (2026)

The nonorthogonal quantum eigensolver (NOQE) is a promising quantum chemistry algorithm that estimates low-lying molecular energies using shallow circuits on near-term devices. We show that overlap thresholding improves the measurement cost of NOQE from O(M^3) to O(M) shots per matrix element, where M is the number of reference states. Source codes for the numerical simulations, based on PySCF and OpenFermion, are available online.

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talks

teaching

Teaching experience 1

Undergraduate course, University 1, Department, 2014

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Teaching experience 2

Workshop, University 1, Department, 2015

This is a description of a teaching experience. You can use markdown like any other post.