Quantum physicist working across hardware, error correction, and applications.
I am a Postdoctoral Scholar at UC Berkeley in Whaley group. I received my PhD in Physics at Duke University, working as a theorist in Brown Lab. I finished my undergrad in Stanford University. I’m originally from South Korea.
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.
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.
MK*, Y. Zhang*, K.R. Brown, and T. Barthel
Physical Review A 113, L061703 (2026) [arXiv:2507.07092]
We identify a novel phase transition in the Rabi model subject to bosonic damping and dephasing, where the latter is non-Gaussian. We show that dephasing is a relevant perturbation, leading to a cascade of stability boundaries for bosonic operators.
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.
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.