A5032794675- Mechanical and Optical Resonators
- Quantum and electron transport phenomena
- Diamond and Carbon-based Materials Research
- Force Microscopy Techniques and Applications
- Metal and Thin Film Mechanics
- Semiconductor materials and devices
- Cold Atom Physics and Bose-Einstein Condensates
- Full-Duplex Wireless Communications
- Superconducting and THz Device Technology
- Magnetic confinement fusion research
- Quantum Information and Cryptography
- Magneto-Optical Properties and Applications
- Near-Field Optical Microscopy
- Neural Networks and Reservoir Computing
- Electron Spin Resonance Studies
- Quantum optics and atomic interactions
- Radio Frequency Integrated Circuit Design
- Theoretical and Computational Physics
- Electromagnetic Simulation and Numerical Methods
- Physics of Superconductivity and Magnetism
- Magnetic Field Sensors Techniques
- Acoustic Wave Resonator Technologies
- Quantum Mechanics and Applications
- Molecular Junctions and Nanostructures
- Neural Networks and Applications
ETH Zurich
2012-2019
University of Colorado Boulder
2016-2019
Joint Institute for Laboratory Astrophysics
2019
National Institute of Standards and Technology
2016-2018
We investigate spin and optical properties of individual nitrogen-vacancy centers located within 1-10 nm from the diamond surface. observe stable defects with a characteristic optically detected magnetic resonance spectrum down to lowest depth. also find small, but systematic spectral broadening for shallower than about 2 nm. This is consistent presence surface paramagnetic impurity layer [Tisler et al., ACS Nano 3, 1959 (2009)] largely decoupled by motional averaging. The observation...
We demonstrate an acoustical analog of a circuit quantum electrodynamics system that leverages acoustic properties to enable strong multimode coupling in the dispersive regime while suppressing spontaneous emission unconfined modes. Specifically, we fabricate and characterize device comprises flux tunable transmon coupled $300\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ long surface wave resonator. For some modes, qubit-cavity reaches 6.5 MHz, exceeding cavity loss rate (200 kHz), qubit...
We report on the design and performance of an on-chip microwave circulator with a widely (GHz) tunable operation frequency. Non-reciprocity is created combination frequency conversion delay, requires neither permanent magnets nor bias tones, allowing integration other superconducting circuits without need for high-bandwidth control lines. Isolation in device exceeds 20 dB over bandwidth tens MHz, its insertion loss small, reaching as low 0.9 at select frequencies. Furthermore, linear respect...
We resolve phonon number states in the spectrum of a superconducting qubit coupled to multimode acoustic cavity. Crucial this resolution is sharp frequency dependence qubit-phonon interaction engineered by coupling surface waves two locations separated ∼40 wavelengths. In analogy double-slit diffraction, resulting interference generates high-contrast structure interaction. observe both rate multiple cavity modes and spontaneous emission into unconfined modes. use single phonons tuning...
Magnetic resonance force microscopy (MRFM) is a scanning probe technique capable of detecting MRI signals from nanoscale sample volumes, providing paradigm-changing potential for structural biology and medical research. Thus far, however, experiments have not reached suffcient spatial resolution retrieving meaningful information samples. In this work, we report MRFM imaging scans demonstrating 0.9 nm localization precision 0.6 in one dimension. Our progress enabled by an improved spin...
We introduce and experimentally characterize a general purpose device for signal processing in circuit quantum electrodynamics systems. The is broadband two-port microwave element with three modes of operation: it can transmit, reflect, or invert incident signals between 4 8 GHz. This property makes versatile tool lossless at cryogenic temperatures. In particular, rapid switching (≤15 ns) these operation enables several multiplexing readout protocols superconducting qubits. report the...
We report a method for accelerated nanoscale nuclear magnetic resonance imaging by detecting several signals in parallel. Our technique relies on phase multiplexing, where the from different spin ensembles are encoded of an ultrasensitive detector. demonstrate this simultaneously acquiring statistically polarized two species (1H, 19F) and up to six spatial locations nanowire test sample using force microscope. obtain one-dimensional resolution better than 5 nm, subnanometer positional accuracy.
The design and realization of a torque magnetometer is reported that reads the deflection membrane by optical interferometry. compact instrument allows for low-temperature measurements tiny crystals less than microgram with significant improvement in sensitivity, signal-to-noise ratio as well data acquisition time compared conventional magnetometry offers an enormous potential further improvements future applications different fields. Magnetic on single-molecule magnets demonstrate...