Publications

Journals

2024

S. Moon, G. Khan, S. T. Elkin, C. J. Ryu, D.-Y. Na, and T. E. Roth, “Computational quantum electromagnetics: Basic concepts and emerging trends,” submitted to IEEE Antennas and Propagation Magazine (pre-print).

G. Khan and T. E. Roth, "Field-based formalism for calculating multi-qubit exchange coupling rates for transmon qubits," submitted to Physical Review Applied (pre-print).

S. Moon, D.-Y. Na, and T. E. Roth, "Analytical quantum full-wave solutions for a 3D circuit quantum electrodynamics system," IEEE Transactions on Antennas and Propagation, vol. 72, no. 8, pp. 6702-6716, Aug. 2024.

S. T. Elkin, M. Haider, and T. E. Roth, "Multiphysics numerical method for modeling Josephson traveling-wave parametric amplifiers," IEEE Journal of Multiscale and Multiphysics Computational Techniques, vol. 9, pp. 247-257, Jul. 2024.

T. E. Roth and S. T. Elkin, "Maxwell-Schrödinger modeling of a superconducting qubit coupled to a transmission line network," IEEE Journal on Multiscale and Multiphysics Computational Techniques, vol. 9, pp. 61-74, Jan. 2024.

2023

J. Zhu, T. E. Roth, D.-Y. Na, and W. C. Chew, "Generalized Helmholtz decomposition for modal analysis of electromagnetic problems in inhomogeneous media," IEEE Journal on Multiscale and Multiphysics Computational Techniques, vol. 8, pp. 332-342,  Aug. 2023.

D.-Y. Na, T. E. Roth, J. Zhu, W. C. Chew, and C. J. Ryu, "Numerical framework for modeling quantum electromagnetic systems involving finite-sized lossy dielectric objects in free space," Physical Review A, vol. 107, pp. 063702, Jun. 2023.

T. E. Roth, R. Ma, and W. C. Chew, "The transmon qubit for electromagnetics engineers: An introduction," IEEE Antennas and Propagation Magazine, vol. 65, no. 2, pp. 8-20,  Apr. 2023.

T. E. Roth and C. A. Braun, "Theoretical and numerical study of wave port boundary conditions for Lorenz gauge potential-based finite element methods," Progress in Electromagnetics Research C, vol. 131, pp. 119-133, Mar. 2023.

2022

T. E. Roth and W. C. Chew, "Full-wave methodology to compute the spontaneous emission rate of a transmon qubit," IEEE Journal on Multiscale and Multiphysics Computational Techniques, vol. 7, pp. 92-101, May 2022.

C. J. Ryu, E. Kudeki, D.-Y. Na, T. E. Roth, and W. C. Chew, "Fourier transform, Dirac commutator, energy conservation, and correspondence principle for electrical engineers," IEEE Journal on Multiscale and Multiphysics Computational Techniques, vol. 7, pp. 69-83, Feb. 2022. 

2021

T. E. Roth and W. C. Chew, "Macroscopic circuit quantum electrodynamics: A new look toward developing full-wave numerical models," IEEE Journal on Multiscale and Multiphysics Computational Technniques, vol. 6, pp. 109-124, Sep. 2021. 

T. E. Roth and W. C. Chew, "Potential-based time domain integral equations free from interior resonances," IEEE Journal on Multiscale and Multiphysics Computational Techniques, vol. 6, pp. 81-91, Jun. 2021.

T. E. Roth and W. C. Chew, "Lorenz gauge potential-based time domain integral equations for analyzing subwavelength penetrable regions," IEEE Journal on Multiscale and Multiphysics Computational Techniques, vol. 6, pp. 24-34, Feb. 2021.

W. C. Chew, D.-Y. Na, P. Bermel, T. E. Roth, C. J. Ryu, and E. Kudeki, "Quantum Maxwell's equations made simple: Employing scalar and vector potential formulation," IEEE Antennas and Propagation Magazine, vol. 63, no. 1, pp. 14-26, Feb. 2021.

2020

T. E. Roth and W. C. Chew, "Radiation gauge potential-based time domain integral equations for penetrable regions," Progress in Electromagnetics Research, vol. 168, pp. 73-86, Oct. 2020.

T. E. Roth and W. C. Chew, "Stability analysis and discretization of A-Φ time domain integral equations for multiscale electromagnetics," Journal of Computational Physics, vol. 408, pp. 109102:1-29, May 2020.

2016 - 2018

T. E. Roth and W. C. Chew, "Development of stable A-Φ time domain integral equations for multiscale electromagnetics," IEEE Journal on Multiscale and Multiphysics Computational Techniques, vol. 3, pp. 255-265, Dec. 2018.

A. Foudazi, T. E. Roth, M. T. Ghasr, R. Zoughi, "Aperture-coupled microstrip patch antenna fed by orthogonal SIW line for millimetre-wave imaging applications," IET Microwave, Antennas & Propagation, pp. 811-817, Dec. 2016.

Conference Proceedings

S. Moon and T. E. Roth, "Development of an analytical quantum full-wave solution for a transmon qubit in a 3D cavity," 2024 18th European Conference on Antennas and Propagation (EuCAP 2024), Glasgow, Scotland, Mar. 17-22, pp. 1-5, (invited talk).

S. Moon and T. E. Roth, "Towards an analytical quantum full-wave solution of a transmon qubit in a 3D microwave cavity," 2024 USNC of URSI National Radio Science Meeting (USNC-URSI NRSM 2024, Boulder, CO, Jan. 9-12, pp. 191.

G. Khan and T. E. Roth, "Calculating multi-qubit exchange coupling rates for transmon qubits using a field-based formalism," 2024 USNC of URSI National Radio Science Meeting (USNC-URSI NRSM 2024, Boulder, CO, Jan. 9-12, pp. 196.

T. E. Roth, D.-Y. Na, C. J. Ryu, W. C. Chew, "Quantum computational electromagnetics -- Recent progress," 2023 International Conference on Electromagnetics in Advanced Applications (ICEAA 2023), Venice, Italy, Oct. 9-13, pp. 661, (invited talk).

S. Moon and T. E. Roth, "Full-wave Hamiltonian analysis of a coaxial-fed 3D microwave cavity resonator," 2023 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting (AP-S/URSI 2023), Portland, OR, Jul. 23-28, 2023, pp. 1375-1376.

S. Moon and T. E. Roth, "Validation of the full-wave projector-based Hamiltonian analysis of port-driven microwave resonators," 2023 Photonics & Electromganetics Research Symposium (PIERS), Prague, Czechia, Jul. 3 - 6, 2023, pp. 1180-1188.

S. Moon, J. Zhu, T. E. Roth, D.-Y. Na, and W. C. Chew, "Projector-based quantization and potential-based numerical mode decomposition for quantum nanophotonics," 2023 Photonics & Electromganetics Research Symposium (PIERS), Prague, Czechia, Jul. 3 - 6, 2023, (invited talk).

T. E. Roth, "Hybrid Maxwell-Schrödinger modeling of a fluxonium qubit capacitively coupled to a transmission line network," 2023 Photonics & Electromganetics Research Symposium (PIERS), Prague, Czechia, Jul. 3 - 6, 2023, (invited talk).

T. E. Roth, "Finite element time domain discretization of a semiclassical Maxwell-Schrödinger model of a transmon qubit," 2023 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO), Winnipeg, Canada, Jun. 28 - 30, 2023, pp. 95-98.

T. E. Roth and S. T. Elkin, "Maxwell-Schrödinger hybrid simulation for analyzing control and readout of transmon qubits," 2023 17th European Conference on Antennas and Propagation (EuCAP), Florence, Italy, Mar. 26 - 31, 2023, pp. 1-5, (invited talk).

J. Zhu, T. E. Roth, W. C. Chew, and D.-Y. Na, "Generalized Helmholtz decomposition for modal analysis of electromagnetic problems in inhomogeneous media," 2023 International Applied Computational Electromagnetics Society (ACES) Symposium, Monterey, CA, Mar. 26 - 31, 2023, pp. 1-2.

S. T. Elkin and T. E. Roth, "Toward a fully-coupled semiclassical model of transmon control dynamics: Classical case," 2022 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting (AP-S/URSI 2022), Denver, CO, Jul. 10-15, 2022, pp. 701-702.

T. E. Roth, "Derivation of a semiclassical model for a transmon capacitively coupled to a transmission line," 2022 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting (AP-S/URSI 2022), Denver, CO, Jul. 10-15, 2022, pp. 467-468.

T. E. Roth and W. C. Chew, "Progress on potential-based time domain integral equations for low frequency and multiscale electromagnetic analysis," 3rd URSI AT-AP-RASC, Gran Canaria, Spain, May 29 - Jun. 3, 2022 (invited talk).

T. E. Roth and W. C. Chew, "Field-based description of the coupling between a transmon qubit and a transmission line geoemtry," 2022 Photonics & Electromagnetics Research Symposium (PIERS), Hangzhou, China, Apr. 25-29, 2022, pp. 90-98.

T. E. Roth and W. C. Chew, "Full-wave computation of the spontaneous emission rate of a transmon qubit," 2021 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting (AP-S/URSI 2021), Singapore, Singapore, Dec. 4-10, 2021, pp. 1801-1802.

J. Zhu, D.-Y. Na, T. E. Roth, and W. C. Chew, "The validity of the radiation gauge," 2021 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting (AP-S/URSI 2020), Singapore, Singapore, Dec. 4-10, 2021, pp. 1799-1800.

C. J. Ryu, E. Kudeki, D.-Y. Na, T. E. Roth, and W. C. Chew, "Fourier transform, Dirac commutator, energy conservation, and correspondence principle: (In memory of Tapan Sarkar and Tatsuo Itoh)," 2021 International Conference on Electromagnetics in Advanced Applications (ICEAA), Honolulu, HI, Aug. 9-13, 2021, pp. 409.

T. E. Roth and W. C. Chew, “Full-wave modeling of the emission of a microwave frequency single photon source,” 2021 International Applied Computational Electromagnetics Society (ACES) Symposium, Virtual, Aug. 1-5, 2021, pp. 1-4 (invited talk).

T. E. Roth and W. C. Chew, “A current and charge integral equation for dielectric regions in the time domain,” 2020 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting (AP-S/URSI 2020), Montreal, Canada, July 5-10, 2020, pp. 1011-1012.

T. E. Roth and W. C. Chew, “Low frequency stable and accurate potential-based time domain integral equations for dielectric regions,” The 42nd Photonics & Electromagnetics Research Symposium in Xiamen, China (PIERS-Xiamen), Xiamen, China, Dec. 17-20, 2019, pp. 2784-2789.

T. E. Roth and W. C. Chew, “Stable discretization of time-domain solvers,” International Conference on Electromagnetics in Advanced Applications & IEEE Topical Conference on Antennas and Propagation in Wireless Communications (ICEAA-IEEE APWC 2019), Granada, Spain, Sep. 9-13, 2019, pp. 1454.

T. E. Roth and W. C. Chew, “Potential-based TDIEs for dielectric regions using magnetic currents,” 2019 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting (AP-S/URSI 2019), Atlanta, GA, July 7-12, 2019, pp. 1443-1444.

T. E. Roth and W. C. Chew, “Role of classical time domain CEM methods for quantum electromagnetics,” 2019 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting (AP-S/URSI 2019), Atlanta, GA, July 7-12, 2019, pp. 1063-1064 (invited talk).

T. E. Roth and W. C. Chew, “Initial potential-based time domain surface integral equations for dielectric regions,” The 41st Photonics & Electromagnetics Research Symposium in Rome, Italy (PIERS-Rome), Rome, Italy, June 17-20, 2019, pp. 81-90.

T. E. Roth and W. C. Chew, “A-Φ time domain integral equations free from interior resonances,” The 40th Photonics & Electromagnetics Research Symposium in Toyama, Japan (PIERS-Toyama), Toyama, Japan, Aug. 1-4, 2018, pp. 190-196.

T. E. Roth and W. C. Chew, “A stable low frequency time domain EFIE with weighted continuity equation,” 2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting (AP-S/URSI 2018), Boston, MA, July 8-13, 2018, pp. 2351-2352.

Book chapters

W. C. Chew, Q. I. Dai, Q. S. Liu, T. Xia, T. E. Roth, H. Gan, A. Liu, S. C. Chen, M. Hidayetoglu, L. J. Jiang, S. Sun, and W.-M. Hwu, “New trends in computational electromagnetics,” Chapter II in New Trends in Computational Electromagnetics, O. Ergül, editors, SciTech Publishing, London, UK, 2019, pp. 13 - 93.