Direct probing of Two-Level-System and point defects in materials using our invented technique called "Broadband Cryogenic Transient Dielectric Spectroscopy (BCTDS)".

High-throughput and modular characterization of defects.

Relevant Publications:

• Q. Wang, J. S. Salcedo-Gallo, S. M. Gómez, R. Leibovitz, J. Freeman, S. Abrego, S. Agnew, W. J. Scheideler, S. Bedkihal, M. Fitzpatrick "Probing the Dynamics of Two-Level System Defect Ensembles via Broadband Cryogenic Transient Dielectric Spectroscopy", arXiv:2505.18263 (2026)

• Q. Wang*, J. S. Salcedo-Gallo*, S. Bedkihal*, T. Xia, M. Olszewski, V. Fatemi, M. Fitzpatrick "Spectroscopy and coherent control of two-level system defect ensembles using a broadband 3D waveguide", Mater. Quantum Technol. 5 (2025)

• B. L. Dwyer, L. V. H. Rodgers, E. K. Urbach, D. Bluvstein, S. Sangtawesin, H. Zhou, Y. Nassab, M. Fitzaptrick, Z. Yuan, K. De Greve, E. L. Peterson, H. Knowles, T. Sumarac, H Chou, A. Gali, V. V. Dobrovitski, M. D. Lukin, and N. P. de Leon "Probing Spin Dynamics on Diamond Surfaces Using a Single Quantum Sensor", PRX Quantum 3 (2022)

• A. P. M. Place, L. V. H. Rodgers, P. Mundada, B. M. Smitham, M. Fitzaptrick, Z. Leng, A. Premkumar, J. Bryon, A. Vrajitoarea, S. Sussman, G. Cheng, T. Madhavan, H. K. Babla, X. H. Le, Y. Gang, B. Jäck, A. Gyenis, N. Yao, R. J. Cava, N. P. de Leon, A. A. Houck "New Material Platform for Superconducting Transmon Qubits with Coherence Times Exceeding 0.3 milliseconds", Nature Communications 12 (2021)

Leveraging Non-Hermitian Quantum Dynamics to Explore New Quantum Simulation and Quantum Sensing Paradigms.

Harnessing gain and loss to explore non-Hermitian dynamics. 

Building magnetometers for real-world sensors.

Relevant Publications: 

• A. S. Carney, J. S. Salcedo-Gallo, S. K. Bedkihal, and M. Fitzpatrick "Role of exceptional points and transmission peak degeneracies in non-Hermitian sensing", Physical Review Applied, 25 (2026)

• J. S. Salcedo-Gallo, M. Burgelman, V. P. Flynn, A. S. Carney, M. Hamdan, T. Gerg, D. C. Smallwood, L. Viola, and M. Fitzpatrick, "Demonstration of a Tunable Non-Hermitian Nonlinear Microwave Dimer", Nature Communications, 16 (2025)

• J. F. Barry, R. A. Irion, M. H. Steinecker, D. K. Freeman, J. J. Kedziora, R. G. Wilcox, and D. A. Braje, "Ferrimagnetic Oscillator Magnetometer", Physical Review Applied, 19 (2023)

Driven dissipative systems for novel physics and sensors. 

Exploring non-hermitian physics.

Generating novel open systems Liouvillians.

Learning to use driven-dissipative dynamics as a resource for stabilizing quantum states.

Nonequilibrium quantum simulation using lattices of resonators and qubits.

Relevant Publications:

• M. Fitzpatrick, N. M. Sundaresan, A. C. Y. Li, J. Koch, and A. A. Houck, "Observation of a Dissipative Phase Transition in a One-Dimensional Circuit QED Lattice", Phys. Rev. X 7, 011016 (2017)

• V. P. Flynn, E. Cobanera, and L. Viola, ''Topology by dissipation: Majorana bosons in metastable quadratic Markovian dynamics'', Physical Review Letters 127, 245701 (2021)

• A. J. Kollár, M. Fitzpatrick, and A. A. Houck, "Hyperbolic Lattices in Circuit Quantum Electrodynamics", Nature 571, 45 (2019)