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39 papers
Elimination of Flux Trapping in Superconducting Circuits in Ambient Magnetic Fields
Rohan T. Kapur, Alex Wynn, Sergey K. Tolpygo +10
Superconductor digital electronics and quantum computing with superconducting qubits are promising next-generation computing technologies. When cooled down or operated in the prese…
Mitigation of Magnetic Flux Trapping in Superconducting Electronics Using Moats
Rohan T. Kapur, Sergey K. Tolpygo, Alex Wynn +7
Magnetic flux (vortex) trapping remains a major obstacle to very large scale integration in superconducting electronics. Moats -- etched regions in circuit layers placed in ground…
Flux-trapping characterization for superconducting electronics using a cryogenic widefield N- diamond microscope
Rohan T. Kapur, Pauli Kehayias, Sergey K. Tolpygo +12
Magnetic flux trapping is a significant hurdle limiting the reliability and scalability of superconducting electronics, yet tools for imaging flux vortices remain slow or insensiti…
Time-resolved diamond magnetic microscopy of superparamagnetic iron-oxide nanoparticles
B. A. Richards, N. Ristoff, J. Smits +19
Superparamagnetic iron-oxide nanoparticles (SPIONs) are promising probes for biomedical imaging, but the heterogeneity of their magnetic properties is difficult to characterize wit…
Wide-field microwave magnetic field imaging with nitrogen-vacancy centers in diamond
Luca Basso, Pauli Kehayias, Jacob Henshaw +4
Non-invasive imaging of microwave (MW) magnetic fields with microscale lateral resolution is pivotal for various applications, such as MW technologies and integrated circuit failur…
Quantum Frequency Mixing using an N- Diamond Microscope
Samuel J. Karlson, Pauli Kehayias, Jennifer M. Schloss +6
Wide-field magnetic microscopy using nitrogen-vacancy (NV) centers in diamond can yield high-quality magnetic images of DC and AC magnetic fields. The unique combination of micron-…
The impact of microwave phase noise on diamond quantum sensing
Andris Berzins, Maziar Saleh Ziabari, Yaser Silani +8
Precision optical measurements of the electron-spin precession of nitrogen-vacancy (NV) centers in diamond form the basis of numerous applications. The most sensitivity-demanding a…
Fault Localization in a Microfabricated Surface Ion Trap using Diamond Nitrogen-Vacancy Center Magnetometry
Pauli Kehayias, Matthew A. Delaney, Raymond A. Haltli +3
As quantum computing hardware becomes more complex with ongoing design innovations and growing capabilities, the quantum computing community needs increasingly powerful techniques…
Super-resolution diamond magnetic microscopy of superparamagnetic nanoparticles
Nazanin Mosavian, Forrest Hubert, Janis Smits +4
Scanning-probe and wide-field magnetic microscopes based on Nitrogen-Vacancy (NV) centers in diamond have enabled remarkable advances in the study of biology and materials, but eac…
Fabrication of thin diamond membranes by Ne implantation
Luca Basso, Michael Titze, Jacob Henshaw +6
Color centers in diamond are one of the most promising tools for quantum information science. Of particular interest is the use of single-crystal diamond membranes with nanoscale-t…
Mitigation of Nitrogen Vacancy Ionization from Material Integration for Quantum Sensing
Jacob Henshaw, Pauli Kehayias, Luca Basso +6
The nitrogen-vacancy (NV) color center in diamond has demonstrated great promise in a wide range of quantum sensing. Recently, there have been a series of proposals and experiments…
Nuclear quadrupole resonance spectroscopy with a femtotesla diamond magnetometer
Yaser Silani, Janis Smits, Ilja Fescenko +8
Sensitive Radio-Frequency (RF) magnetometers that can detect oscillating magnetic fields at the femtotesla level are needed for demanding applications such as Nuclear Quadrupole Re…
High-Resolution Short-Circuit Fault Localization in a Multi-Layer Integrated Circuit using a Quantum Diamond Microscope
P. Kehayias, J. Walraven, A. L. Rodarte +1
As integrated circuit (IC) geometry and packaging become more sophisticated with ongoing fabrication and design innovations, the electrical engineering community needs increasingly…
Surface roughness noise analysis and comprehensive noise effects on depth-dependent coherence time of NV centers in diamond
Philip Chrostoski, Pauli Kehayias, D. H. Santamore
Noise is a detrimental issue for nitrogen-vacancy (NV) centers in diamond, causing line broadening and decreasing the coherence time (T2). Following our previous electric and magne…
Current Paths in an Atomic Precision Advanced Manufactured Device Imaged by Nitrogen-Vacancy Diamond Magnetic Microscopy
Luca Basso, Pauli Kehayias, Jacob Henshaw +7
The recently-developed ability to control phosphorous-doping of silicon at an atomic level using scanning tunneling microscopy (STM), a technique known as atomic-precision-advanced…
Directional Detection of Dark Matter Using Solid-State Quantum Sensing
Reza Ebadi, Mason C. Marshall, David F. Phillips +12
Next-generation dark matter (DM) detectors searching for weakly interacting massive particles (WIMPs) will be sensitive to coherent scattering from solar neutrinos, demanding an ef…
Nanoscale Solid-State Nuclear Quadrupole Resonance Spectroscopy using Depth-Optimized Nitrogen-Vacancy Ensembles in Diamond
Jacob Henshaw, Pauli Kehayias, Maziar Saleh Ziabari +9
Nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) spectroscopy of bulk quantum materials have provided insight into phenomena such as quantum phase criticalit…
Measurement and Simulation of the Magnetic Fields from a 555 Timer Integrated Circuit using a Quantum Diamond Microscope and Finite Element Analysis
P. Kehayias, E. V. Levine, L. Basso +12
Quantum Diamond Microscope (QDM) magnetic field imaging is an emerging interrogation and diagnostic technique for integrated circuits (ICs). To date, the ICs measured with a QDM we…
A fitting algorithm for optimizing ion implantation energies and fluences
Pauli Kehayias, Jacob Henshaw, Maziar Saleh Ziabari +4
We describe a method to automatically generate an ion implantation recipe, a set of energies and fluences, to produce a desired defect density profile in a solid using the fewest r…
Magnetic Field Fingerprinting of Integrated Circuit Activity with a Quantum Diamond Microscope
Matthew J. Turner, Nicholas Langellier, Rachel Bainbridge +9
Current density distributions in active integrated circuits (ICs) result in patterns of magnetic fields that contain structural and functional information about the IC. Magnetic fi…
A physically unclonable function using NV diamond magnetometry and micromagnet arrays
Pauli Kehayias, Ezra Bussmann, Tzu-Ming Lu +1
A physically unclonable function (PUF) is an embedded hardware security measure that provides protection against counterfeiting. Here we present our work on using an array of rando…
Diamond magnetometer enhanced by ferrite flux concentrators
Ilja Fescenko, Andrey Jarmola, Igor Savukov +6
Magnetometers based on nitrogen-vacancy (NV) centers in diamond are promising room-temperature, solid-state sensors. However, their reported sensitivity to magnetic fields at low f…
Principles and Techniques of the Quantum Diamond Microscope
Edlyn V. Levine, Matthew J. Turner, Pauli Kehayias +6
We provide an overview of the experimental techniques, measurement modalities, and diverse applications of the Quantum Diamond Microscope (QDM). The QDM employs a dense layer of fl…
Imaging crystal stress in diamond using ensembles of nitrogen-vacancy centers
P. Kehayias, M. J. Turner, R. Trubko +5
We present a micrometer-resolution millimeter-field-of-view stress imaging method for diamonds containing a thin surface layer of nitrogen vacancy (NV) centers. In this method, we…