930 citations · 2.9k across the 14 of their papers we have counts for
14 papers
Weakly Flux-Tunable Superconducting Qubit
José M. Chávez-Garcia, Firat Solgun, Jared B. Hertzberg +3
Flux-tunable qubits are a useful resource for superconducting quantum processors. They can be used to perform cPhase gates, facilitate fast reset protocols, avoid qubit-frequency c…
Effects of surface treatments on flux tunable transmon qubits
M. Mergenthaler, C. Müller, M. Ganzhorn +9
One of the main limitations in state-of-the art solid-state quantum processors are qubit decoherence and relaxation due to noise in their local environment. For the field to advanc…
High-fidelity superconducting quantum processors via laser-annealing of transmon qubits
Eric J. Zhang, Srikanth Srinivasan, Neereja Sundaresan +19
Scaling the number of qubits while maintaining high-fidelity quantum gates remains a key challenge for quantum computing. Presently, superconducting quantum processors with >50-qub…
Ultrahigh Vacuum Packaging and Surface Cleaning for Quantum Devices
M. Mergenthaler, S. Paredes, P. Müller +7
We describe design, implementation and performance of an ultra-high vacuum (UHV) package for superconducting qubit chips or other surface sensitive quantum devices. The UHV loading…
Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors
Jared B. Hertzberg, Eric J. Zhang, Sami Rosenblatt +8
As superconducting quantum circuits scale to larger sizes, the problem of frequency crowding proves a formidable task. Here we present a solution for this problem in fixed-frequenc…
Suppression of Unwanted Interactions in a Hybrid Two-Qubit System
Jaseung Ku, Xuexin Xu, Markus Brink +4
Mitigating crosstalk errors, whether classical or quantum mechanical, is critically important for achieving high-fidelity entangling gates in multi-qubit circuits. For weakly anhar…
Topological and subsystem codes on low-degree graphs with flag qubits
Christopher Chamberland, Guanyu Zhu, Theodore J. Yoder +2
In this work we introduce two code families, which we call the heavy hexagon code and heavy square code. Both code families are implemented by assigning physical data and ancilla q…
Tunable Superconducting Qubits with Flux-Independent Coherence
M. D. Hutchings, Jared B. Hertzberg, Yebin Liu +4
We have studied the impact of low-frequency magnetic flux noise upon superconducting transmon qubits with various levels of tunability. We find that qubits with weaker tunability e…
Broadband Filters for Abatement of Spontaneous Emission in Circuit Quantum Electrodynamics
Nicholas T. Bronn, Yanbing Liu, Jared B. Hertzberg +4
The ability to perform fast, high-fidelity readout of quantum bits (qubits) is essential to the goal of building a quantum computer. However, coupling a fast measurement channel to…
Preparation and Detection of a Mechanical Resonator Near the Ground State of Motion
T. Rocheleau, T. Ndukum, C. Macklin +3
We have cooled the motion of a radio-frequency nanomechanical resonator by parametric coupling to a driven microwave frequency superconducting resonator. Starting from a thermal oc…
Back-action Evading Measurements of Nanomechanical Motion
J. B. Hertzberg, T. Rocheleau, T. Ndukum +3
When performing continuous measurements of position with sensitivity approaching quantum mechanical limits, one must confront the fundamental effects of detector back-action. Back-…
Demonstration of an ultracold micro-optomechanical oscillator in a cryogenic cavity
Simon Groeblacher, Jared B. Hertzberg, Michael R. Vanner +4
Preparing and manipulating quantum states of mechanical resonators is a highly interdisciplinary undertaking that now receives enormous interest for its far-reaching potential in f…
Self-cooling of a micro-mirror by radiation pressure
S. Gigan, H. R. Boehm, M. Paternostro +7
We demonstrate passive feedback cooling of a mechanical resonator based on radiation pressure forces and assisted by photothermal forces in a high-finesse optical cavity. The reson…
A high-reflectivity high-Q micromechanical Bragg-mirror
H. R. Boehm, S. Gigan, G. Langer +6
We report on the fabrication and characterization of a micromechanical oscillator consisting only of a free-standing dielectric Bragg mirror with high optical reflectivity and high…