A5045054476- Physics of Superconductivity and Magnetism
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum and electron transport phenomena
- Advanced Condensed Matter Physics
- Atomic and Subatomic Physics Research
- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Electronic and Structural Properties of Oxides
- Semiconductor materials and devices
- Advanced Chemical Physics Studies
- Quantum many-body systems
- Quantum, superfluid, helium dynamics
- Surface and Thin Film Phenomena
- Microwave and Dielectric Measurement Techniques
- Magnetic and transport properties of perovskites and related materials
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Nuclear Materials and Properties
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Frequency and Time Standards
- Acoustic Wave Resonator Technologies
Harvard University
2022-2025
Princeton University
2021-2023
The superconducting transmon qubit is a leading platform for quantum computing and science. Building large, useful systems based on qubits will require significant improvements in relaxation coherence times, which are orders of magnitude shorter than limits imposed by bulk properties the constituent materials. This indicates that likely originates from uncontrolled surfaces, interfaces, contaminants. Previous efforts to improve lifetimes have focused primarily designs minimize contributions...
Over the past decades, superconducting qubits have emerged as one of leading hardware platforms for realizing a quantum processor. Consequently, researchers made significant effort to understand loss channels that limit coherence times qubits. A major source has been attributed two level systems are present at material interfaces. It is recently shown replacing metal in capacitor transmon with tantalum yields record relaxation and qubits, motivating detailed study surface. In this work,...
Superconducting qubits are a leading system for realizing large-scale quantum processors, but overall gate fidelities suffer from coherence times limited by microwave dielectric loss. Recently discovered tantalum-based exhibit record lifetimes exceeding 0.3 ms. Here, we perform systematic, detailed measurements of superconducting tantalum resonators in order to disentangle sources loss that limit state-of-the-art devices. By studying the dependence on temperature, photon number, and device...
Ultracold fermionic atoms in optical lattices offer pristine realizations of Hubbard models, which are fundamental to modern condensed matter physics and the study strongly-correlated quantum materials. Despite significant advancements, accessible temperatures these lattice material analogs still too high address many open problems beyond reach current numerical techniques. Here, we demonstrate a several-fold reduction temperature, bringing large-scale simulations model into an entirely new...
Geometrical frustration in strongly correlated systems can give rise to a plethora of novel ordered states and intriguing magnetic phases, such as quantum spin liquids. Promising candidate materials for phases be described by the Hubbard model on an anisotropic triangular lattice, paradigmatic capturing interplay between strong correlations frustration. However, fate frustrated magnetism presence itinerant dopants remains unclear, well its connection doped square model. Here we investigate...
Superconducting qubits are a leading system for realizing large scale quantum processors, but overall gate fidelities suffer from coherence times limited by microwave dielectric loss. Recently discovered tantalum-based exhibit record lifetimes exceeding 0.3 ms. Here we perform systematic, detailed measurements of superconducting tantalum resonators in order to disentangle sources loss that limit state-of-the-art devices. By studying the dependence on temperature, photon number, and device...
Strongly correlated materials feature multiple electronic orbitals which are crucial to accurately understand their many-body properties, from cuprate twisted bilayer graphene. In such multi-band models, quantum interference can lead dispersionless bands whose large degeneracy gives rise itinerant magnetism even with weak interactions. Here, we report on signatures of a ferrimagnetic state realized in Lieb lattice at half-filling, characterized by antialigned magnetic moments...
Quantum interference can deeply alter the nature of many-body phases matter. In paradigmatic case Hubbard model, Nagaoka famously proved that introducing a single itinerant charge transform paramagnetic insulator into ferromagnet through path interference. However, microscopic observation such kinetic magnetism induced by individually imaged dopants has been so far elusive. Here we demonstrate emergence polarons in system realized with strongly interacting fermions triangular optical...
We identify candidate loss channels in tantalum by correlating X-ray photoelectron spectroscopy measurements with power and temperature dependent variation of the quality factor superconducting coplanar waveguide microwave resonators.
Over the past decades, superconducting qubits have emerged as one of leading hardware platforms for realizing a quantum processor. Consequently, researchers made significant effort to understand loss channels that limit coherence times qubits. A major source has been attributed two level systems are present at material interfaces. We recently showed replacing metal in capacitor transmon with tantalum yields record relaxation and qubits, motivating detailed study surface. In this work, we...