98 citations · 531 across the 21 of their papers we have counts for
21 papers
Microwave-driven same-species sympathetic cooling for trapped ions
M. C. Smith, E. Vandrey, A. D. Leu +5
Sympathetic cooling of data qubits by coolant ions is an essential technique for trapped-ion quantum computing. Conventionally a second ion species is used, requiring additional la…
Single-qubit gates with errors at the level
M. C. Smith, A. D. Leu, K. Miyanishi +2
We report the achievement of single-qubit gates with sub-part-per-million error rates, in a trapped-ion Ca hyperfine clock qubit. We explore the speed/fidelity trade-o…
Polarisation-insensitive state preparation for trapped-ion hyperfine qubits
A. D. Leu, M. C. Smith, M. F. Gely +1
Quantum state preparation for trapped-ion qubits often relies on high-quality circularly-polarised light, which may be difficult to achieve with chip-based integrated optics techno…
Robust and fast microwave-driven quantum logic for trapped-ion qubits
M. A. Weber, M. F. Gely, R. K. Hanley +5
Microwave-driven logic is a promising alternative to laser control in scaling trapped-ion based quantum processors. However, such electronic gates have yet to match the speed offer…
In-situ characterization of qubit drive-phase distortions
M. F. Gely, J. M. Litarowicz, A. D. Leu +1
Reducing errors in quantum gates is critical to the development of quantum computers. To do so, any distortions in the control signals should be identified, however, conventional t…
Individually-addressed quantum gate interactions using dynamical decoupling
M. C. Smith, A. D. Leu, M. F. Gely +1
A leading approach to implementing small-scale quantum computers has been to use laser beams, focused to micron spot sizes, to address and entangle trapped ions in a linear crystal…
Fast, high-fidelity addressed single-qubit gates using efficient composite pulse sequences
A. D. Leu, M. F. Gely, M. A. Weber +3
We use electronic microwave control methods to implement addressed single-qubit gates with high speed and fidelity, for hyperfine "atomic clock" qubits in a cr…
Cryogenic ion trap system for high-fidelity near-field microwave-driven quantum logic
M. A. Weber, C. Löschnauer, J. Wolf +6
We report the design, fabrication, and characterization of a cryogenic ion trap system for the implementation of quantum logic driven by near-field microwaves. The trap incorporate…
Apparent nonlinear damping triggered by quantum fluctuations
Mario F. Gely, Adrián Sanz Mora, Shun Yanai +3
Nonlinear damping, the change in damping rate with the amplitude of oscillations plays an important role in many electrical, mechanical and even biological oscillators. In novel te…
Phonon-number resolution of voltage-biased mechanical oscillators with weakly-anharmonic superconducting circuits
Mario F. Gely, Gary A. Steele
Observing quantum phenomena in macroscopic objects, and the potential discovery of a fundamental limit in the applicability of quantum mechanics, has been a central topic of modern…
Superconducting electro-mechanics to test Diósi-Penrose effects of general relativity in massive superpositions
Mario F. Gely, Gary A. Steele
Attempting to reconcile general relativity with quantum mechanics is one of the great undertakings of contemporary physics. Here we present how the incompatibility between the two…
Measuring and controlling radio-frequency quanta with superconducting circuits
Mario Florentin Gely
In this PhD thesis, we will present the theoretical and experimental work that led to the realization of a radio-frequency circuit quantum electrodynamics system (RFcQED). In chapt…
Current detection using a Josephson parametric upconverter
Felix E. Schmidt, Daniel Bothner, Ines C. Rodrigues +3
We present the design, measurement and analysis of a current sensor based on a process of Josephson parametric upconversion in a superconducting microwave cavity. Terminating a cop…
QuCAT: Quantum Circuit Analyzer Tool in Python
Mario F. Gely, Gary A. Steele
Quantum circuits constructed from Josephson junctions and superconducting electronics are key to many quantum computing and quantum optics applications. Designing these circuits in…
Observation and stabilization of photonic Fock states in a hot radio-frequency resonator
Mario F. Gely, Marios Kounalakis, Christian Dickel +5
Detecting weak radio-frequency electromagnetic fields plays a crucial role in wide range of fields, from radio astronomy to nuclear magnetic resonance imaging. In quantum mechanics…
Sideband cooling of nearly degenerate micromechanical oscillators in a multimode optomechanical system
C. F. Ockeloen-Korppi, M. F. Gely, E. Damskägg +3
Multimode optomechanical systems are an emerging platform for studying fundamental aspects of matter near the quantum ground state and are useful in sensitive sensing and measureme…
The nature of the Lamb shift in weakly-anharmonic atoms: from normal mode splitting to quantum fluctuations
Mario F. Gely, Gary A. Steele, Daniel Bothner
When a two level system (TLS) is coupled to an electromagnetic resonator, its transition frequency changes in response to the quantum vacuum fluctuations of the electromagnetic fie…
Multi-mode ultra-strong coupling in circuit quantum electrodynamics
Sal J. Bosman, Mario F. Gely, Vibhor Singh +3
With the introduction of superconducting circuits into the field of quantum optics, many novel experimental demonstrations of the quantum physics of an artificial atom coupled to a…
Approaching ultra-strong coupling in Transmon circuit-QED using a high-impedance resonator
Sal J. Bosman, Mario F. Gely, Vibhor Singh +3
In this experiment, we couple a superconducting Transmon qubit to a high-impedance microwave resonator. Doing so leads to a large qubit-resonator coupling rate , measur…
Convergence of the multimode quantum Rabi model of circuit quantum electrodynamics
Mario F. Gely, Adrian Parra-Rodriguez, Daniel Bothner +4
Circuit quantum electrodynamics (QED) studies the interaction of artificial atoms, open transmission lines and electromagnetic resonators fabricated from superconducting electronic…
Mechanical dissipation in MoRe superconducting metal drums
S. Yanai, V. Singh, M. Yuan +3
We experimentally investigate dissipation in mechanical resonators made of a disordered superconducting thin film of Molybdenum-Rhenium(MoRe) alloy. By electrostatically driving th…