Mattias Fitzpatrick
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View article: Spectroscopy and Coherent Control of Two-Level System Defect Ensembles Using a Broadband 3D Waveguide
Spectroscopy and Coherent Control of Two-Level System Defect Ensembles Using a Broadband 3D Waveguide Open
Defects in solid-state materials play a central role in determining coherence, stability, and performance in quantum technologies. Although narrowband techniques can probe specific resonances with high precision, a broadband spectroscopic …
View article: Demonstration of a tunable non-Hermitian nonlinear microwave dimer
Demonstration of a tunable non-Hermitian nonlinear microwave dimer Open
View article: Unification of Exceptional Points and Transmission Peak Degeneracies in a Highly Tunable Magnon-Photon Dimer
Unification of Exceptional Points and Transmission Peak Degeneracies in a Highly Tunable Magnon-Photon Dimer Open
Exceptional points (EPs), spectral singularities arising in non-Hermitian dynamical systems, have drawn widespread attention for their potential to enhance sensor capability by leveraging characteristic square-root frequency splitting. How…
View article: Nanoscale covariance magnetometry with diamond quantum sensors
Nanoscale covariance magnetometry with diamond quantum sensors Open
Nitrogen vacancy (NV) centers in diamond are atom-scale defects that can be used to sense magnetic fields with high sensitivity and spatial resolution. Typically, the magnetic field is measured by averaging sequential measurements of singl…
View article: Probing Spin Dynamics on Diamond Surfaces Using a Single Quantum Sensor
Probing Spin Dynamics on Diamond Surfaces Using a Single Quantum Sensor Open
Understanding the dynamics of a quantum bit's environment is essential for the realization of practical systems for quantum information processing and metrology. We use single nitrogen-vacancy (NV) centers in diamond to study the dynamics …
View article: Nanoscale covariance magnetometry with diamond quantum sensors
Nanoscale covariance magnetometry with diamond quantum sensors Open
Nitrogen vacancy (NV) centers in diamond are atom-scale defects that can be used to sense magnetic fields with high sensitivity and spatial resolution. Typically, the magnetic field is measured by averaging sequential measurements of singl…
View article: Nanoscale covariance magnetometry with diamond quantum sensors
Nanoscale covariance magnetometry with diamond quantum sensors Open
Nitrogen vacancy (NV) centers in diamond are atom-scale defects with long spin coherence times that can be used to sense magnetic fields with high sensitivity and spatial resolution. Typically, the magnetic field projection at a single poi…
View article: Experimental Bayesian estimation of quantum state preparation, measurement, and gate errors in multiqubit devices
Experimental Bayesian estimation of quantum state preparation, measurement, and gate errors in multiqubit devices Open
We introduce a Bayesian method for the estimation of single qubit errors in\nquantum devices, and use it to characterize these errors on three 27-qubit\nsuperconducting qubit devices. We self-consistently estimate up to seven\nparameters o…
View article: Probing spin dynamics on diamond surfaces using a single quantum sensor
Probing spin dynamics on diamond surfaces using a single quantum sensor Open
Understanding the dynamics of a quantum bit's environment is essential for the realization of practical systems for quantum information processing and metrology. We use single nitrogen-vacancy (NV) centers in diamond to study the dynamics …
View article: New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds
New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds Open
The superconducting transmon qubit is a leading platform for quantum computing and quantum science. Building large, useful quantum systems based on transmon qubits will require significant improvements in qubit relaxation and coherence tim…
View article: Observation of a dissipative phase transition in a one-dimensional circuit QED lattice
Observation of a dissipative phase transition in a one-dimensional circuit QED lattice Open
Condensed matter physics has been driven forward by significant experimental and theoretical progress in the study and understanding of equilibrium phase transitions based on symmetry and topology. However, nonequilibrium phase transitions…