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View article: High-performance superconducting quantum processors via laser annealing of transmon qubits
High-performance superconducting quantum processors via laser annealing of transmon qubits Open
Scaling the number of qubits while maintaining high-fidelity quantum gates remains a key challenge for quantum computing. Presently, superconducting quantum processors with >50 qubits are actively available. For these systems, fixed-freque…
View article: Weakly Flux-Tunable Superconducting Qubit
Weakly Flux-Tunable Superconducting Qubit Open
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 collisions in large processors, and enable certain fast read…
View article: Environmental radiation impact on lifetimes and quasiparticle tunneling rates of fixed-frequency transmon qubits
Environmental radiation impact on lifetimes and quasiparticle tunneling rates of fixed-frequency transmon qubits Open
Quantum computing relies on the operation of qubits in an environment as free of noise as possible. Assessing the quality of this environment is a key aspect of ensuring high-fidelity implementations based on superconducting qubits. Relaxa…
View article: High-Fidelity Qubit Readout Using Interferometric Directional Josephson Devices
High-Fidelity Qubit Readout Using Interferometric Directional Josephson Devices Open
Nonreciprocal microwave devices, such as circulators and isolators, are needed in high-fidelity qubit readout schemes to unidirectionally route the readout signals and protect the qubits against noise coming from the output chain. However,…
View article: Effects of surface treatments on flux tunable transmon qubits
Effects of surface treatments on flux tunable transmon qubits Open
One of the main limitations in state-of-the art solid-state quantum processors is qubit decoherence and relaxation due to noise from adsorbates on surfaces, impurities at interfaces, and material defects. For the field to advance towards f…
View article: Effects of surface treatments on flux tunable transmon qubits
Effects of surface treatments on flux tunable transmon qubits Open
Datasets for paper Effects of surface treatments on flux tunable transmon qubits. The datasets provide the data for Figures 2-5 in csv format and a description on how the figures can be reproduced.
View article: Effects of surface treatments on flux tunable transmon qubits
Effects of surface treatments on flux tunable transmon qubits Open
Datasets for paper Effects of surface treatments on flux tunable transmon qubits. The datasets provide the data for Figures 2-5 in csv format and a description on how the figures can be reproduced.
View article: Ultrahigh vacuum packaging and surface cleaning for quantum devices
Ultrahigh vacuum packaging and surface cleaning for quantum devices Open
Datasets associated with the paper "Ultrahigh vacuum packaging and surface cleaning for quantum devices". Datasets for the plots in Figures 4, 5, 6 and Table I are provided. Toc.pdf links the data to the figures and adds information on how…
View article: Demonstration of quantum volume 64 on a superconducting quantum computing system
Demonstration of quantum volume 64 on a superconducting quantum computing system Open
We improve the quality of quantum circuits on superconducting quantum computing systems, as measured by the quantum volume (QV), with a combination of dynamical decoupling, compiler optimizations, shorter two-qubit gates, and excited state…
View article: Ultrahigh vacuum packaging and surface cleaning for quantum devices
Ultrahigh vacuum packaging and surface cleaning for quantum devices Open
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 procedure allows for annealing, ultra-violet light irradi…
View article: High-fidelity superconducting quantum processors via laser-annealing of transmon qubits
High-fidelity superconducting quantum processors via laser-annealing of transmon qubits Open
Scaling the number of qubits while maintaining high-fidelity quantum gates remains a key challenge for quantum computing. Presently, superconducting quantum processors with >50-qubits are actively available. For such systems, fixed-frequen…
View article: Real-time processing of stabilizer measurements in a bit-flip code
Real-time processing of stabilizer measurements in a bit-flip code Open
Although qubit coherence times and gate fidelities are continuously improving, logical encoding is essential to achieve fault tolerance in quantum computing. In most encoding schemes, correcting or tracking errors throughout the computatio…
View article: Demonstration of quantum volume 64 on a superconducting quantum\n computing system
Demonstration of quantum volume 64 on a superconducting quantum\n computing system Open
We improve the quality of quantum circuits on superconducting quantum\ncomputing systems, as measured by the quantum volume, with a combination of\ndynamical decoupling, compiler optimizations, shorter two-qubit gates, and\nexcited state p…
View article: On-chip single-pump interferometric Josephson isolator for quantum measurements
On-chip single-pump interferometric Josephson isolator for quantum measurements Open
Nonreciprocal microwave devices, such as circulators and isolators, are critical in high-fidelity qubit readout schemes. They unidirectionally route the readout signals and protect the qubits against noise coming from the output chain. How…
View article: Real-time decoding of stabilizer measurements in a bit-flip code
Real-time decoding of stabilizer measurements in a bit-flip code Open
Although qubit coherence times and gate fidelities are continuously improving, logical encoding is essential to achieve fault tolerance in quantum computing. In most encoding schemes, correcting or tracking errors throughout the computatio…
View article: Multi-path interferometric Josephson directional amplifier for qubit readout
Multi-path interferometric Josephson directional amplifier for qubit readout Open
We realize and characterize a quantum-limited, directional Josephson amplifier suitable for qubit readout. The device consists of two nondegenerate, three-wave-mixing amplifiers that are coupled together in an interferometric scheme, embed…
View article: Multi-Path Interferometric Josephson Directional Amplifier for Qubit\n Readout
Multi-Path Interferometric Josephson Directional Amplifier for Qubit\n Readout Open
We realize and characterize a quantum-limited, directional Josephson\namplifier suitable for qubit readout. The device consists of two nondegenerate,\nthree-wave-mixing amplifiers that are coupled together in an interferometric\nscheme, em…
View article: Gyrator Operation Using Josephson Mixers
Gyrator Operation Using Josephson Mixers Open
Nonreciprocal microwave devices, such as circulators, are useful in routing\nquantum signals in quantum networks and protecting quantum systems against\nnoise coming from the detection chain. However, commercial, cryogenic\ncirculators, no…
View article: Wafer-scale integration of sacrificial nanofluidic chips for detecting and manipulating single DNA molecules
Wafer-scale integration of sacrificial nanofluidic chips for detecting and manipulating single DNA molecules Open
Wafer-scale fabrication of complex nanofluidic systems with integrated electronics is essential to realizing ubiquitous, compact, reliable, high-sensitivity and low-cost biomolecular sensors. Here we report a scalable fabrication strategy …
View article: Demonstration of Weight-Four Parity Measurements in the Surface Code Architecture
Demonstration of Weight-Four Parity Measurements in the Surface Code Architecture Open
We present parity measurements on a five-qubit lattice with connectivity amenable to the surface code quantum error correction architecture. Using all-microwave controls of superconducting qubits coupled via resonators, we encode the parit…