Alexander Bilmes
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View article: Reinforcement Learning Control of Quantum Error Correction
Reinforcement Learning Control of Quantum Error Correction Open
The promise of fault-tolerant quantum computing is challenged by environmental drift that relentlessly degrades the quality of quantum operations. The contemporary solution, halting the entire quantum computation for recalibration, is unsu…
View article: Data for "Observation of disorder-free localization using a (2+1)D lattice gauge theory on a quantum processor"
Data for "Observation of disorder-free localization using a (2+1)D lattice gauge theory on a quantum processor" Open
This dataset contains the experimental data for arXiv:2410.06557, as well as two notebooks showing how to read the data files and reproduce figures from the paper. `1D` contains the data to reproduce Figure 1 and associated SM figures. `2D…
View article: Observation of constructive interference at the edge of quantum ergodicity
Observation of constructive interference at the edge of quantum ergodicity Open
The dynamics of quantum many-body systems is characterized by quantum observables that are reconstructed from correlation functions at separate points in space and time1-3. In dynamics with fast entanglement generation, however,…
View article: Visualizing dynamics of charges and strings in (2 + 1)D lattice gauge theories
Visualizing dynamics of charges and strings in (2 + 1)D lattice gauge theories Open
Lattice gauge theories (LGTs)1-4 can be used to understand a wide range of phenomena, from elementary particle scattering in high-energy physics to effective descriptions of many-body interactions in materials5-7. Stu…
View article: Visualizing Dynamics of Charges and Strings in (2+1)D Lattice Gauge Theories
Visualizing Dynamics of Charges and Strings in (2+1)D Lattice Gauge Theories Open
The datasets contained herein correspond to the raw data from the quantum processor and displayed results of the main figures of Visualizing Dynamics of Charges and Strings in (2+1)D Lattice Gauge Theories, published in Nature. For details…
View article: Thermalization and criticality on an analogue–digital quantum simulator
Thermalization and criticality on an analogue–digital quantum simulator Open
Understanding how interacting particles approach thermal equilibrium is a major challenge of quantum simulators 1,2 . Unlocking the full potential of such systems towards this goal requires flexible initial state preparation, precise time …
View article: Scaling and logic in the color code on a superconducting quantum processor
Scaling and logic in the color code on a superconducting quantum processor Open
Quantum error correction is essential for bridging the gap between the error rates of physical devices and the extremely low logical error rates required for quantum algorithms. Recent error-correction demonstrations on superconducting pro…
View article: Demonstrating dynamic surface codes
Demonstrating dynamic surface codes Open
A remarkable characteristic of quantum computing is the potential for reliable computation despite faulty qubits. This can be achieved through quantum error correction, which is typically implemented by repeatedly applying static syndrome …
View article: Quantum error correction below the surface code threshold
Quantum error correction below the surface code threshold Open
View article: Resisting High-Energy Impact Events through Gap Engineering in Superconducting Qubit Arrays
Resisting High-Energy Impact Events through Gap Engineering in Superconducting Qubit Arrays Open
Quantum error correction (QEC) provides a practical path to fault-tolerant quantum computing through scaling to large qubit numbers, assuming that physical errors are sufficiently uncorrelated in time and space. In superconducting qubit ar…
View article: Phase transitions in random circuit sampling
Phase transitions in random circuit sampling Open
View article: Quantum error correction below the surface code threshold
Quantum error correction below the surface code threshold Open
Quantum error correction provides a path to reach practical quantum computing by combining multiple physical qubits into a logical qubit, where the logical error rate is suppressed exponentially as more qubits are added. However, this expo…
View article: Thermalization and Criticality on an Analog-Digital Quantum Simulator
Thermalization and Criticality on an Analog-Digital Quantum Simulator Open
Understanding how interacting particles approach thermal equilibrium is a major challenge of quantum simulators. Unlocking the full potential of such systems toward this goal requires flexible initial state preparation, precise time evolut…
View article: Giant Two-Level Systems in a Granular Superconductor
Giant Two-Level Systems in a Granular Superconductor Open
Disordered thin films are a common choice of material for superconducting, high impedance circuits used in quantum information or particle detector physics. A wide selection of materials with different levels of granularity are available, …
View article: Two-tone spectroscopy for the detection of two-level systems in superconducting qubits
Two-tone spectroscopy for the detection of two-level systems in superconducting qubits Open
Two-level systems (TLS) of unclear physical origin are a major contributor to decoherence in superconducting qubits. The interactions of individual TLS with a qubit can be detected via various spectroscopic methods, most of which have reli…
View article: Data for "Phase transition in Random Circuit Sampling"
Data for "Phase transition in Random Circuit Sampling" Open
<p><strong>Purpose</strong></p>\n\n<p>This dataset defines the Random Quantum Circuits (RQCs) used in our paper "Phase transition in Random Circuit Sampling" and lists the bitstrings observed in the …
View article: Observation of giant two-level systems in a granular superconductor
Observation of giant two-level systems in a granular superconductor Open
Disordered thin films are a common choice of material for superconducting, high impedance circuits used in quantum information or particle detector physics. A wide selection of materials with different levels of granularity are available, …
View article: Dynamics of magnetization at infinite temperature in a Heisenberg spin chain
Dynamics of magnetization at infinite temperature in a Heisenberg spin chain Open
Understanding universal aspects of quantum dynamics is an unresolved problem in statistical mechanics. In particular, the spin dynamics of the 1D Heisenberg model were conjectured to belong to the Kardar-Parisi-Zhang (KPZ) universality cla…
View article: Enhancing the Coherence of Superconducting Quantum Bits with Electric Fields
Enhancing the Coherence of Superconducting Quantum Bits with Electric Fields Open
In the endeavour to make quantum computers a reality, integrated superconducting circuits have become a promising architecture. A major challene of this approach is decoherence originating from spurious atomic tunneling defects at the inte…
View article: Probing defect densities at the edges and inside Josephson junctions of superconducting qubits
Probing defect densities at the edges and inside Josephson junctions of superconducting qubits Open
View article: Resolving catastrophic error bursts from cosmic rays in large arrays of superconducting qubits
Resolving catastrophic error bursts from cosmic rays in large arrays of superconducting qubits Open
View article: Realizing topologically ordered states on a quantum processor
Realizing topologically ordered states on a quantum processor Open
Synthesizing topological order Topologically ordered matter exhibits long-range quantum entanglement. However, measuring this entanglement in real materials is extremely tricky. Now, two groups take a different approach and turn to synthet…
View article: Data for "Realizing topologically ordered states on a quantum processor"
Data for "Realizing topologically ordered states on a quantum processor" Open
Data and code used in "Realizing topologically ordered states on a quantum processor," Satzinger et al. (2021), preprint at https://arxiv.org/abs/2104.01180
View article: In-situ bandaged Josephson junctions for superconducting quantum processors
In-situ bandaged Josephson junctions for superconducting quantum processors Open
Shadow evaporation is commonly used to micro-fabricate the key element of superconducting qubits—the Josephson junction. However, in conventional two-angle deposition circuit topology, unwanted stray Josephson junctions are created which c…
View article: Quantum sensors for microscopic tunneling systems
Quantum sensors for microscopic tunneling systems Open
View article: Publisher Correction: Resolving the positions of defects in superconducting quantum bits
Publisher Correction: Resolving the positions of defects in superconducting quantum bits Open
View article: Resolving the positions of defects in superconducting quantum bits
Resolving the positions of defects in superconducting quantum bits Open
Solid-state quantum coherent devices are quickly progressing. Superconducting circuits, for instance, have already been used to demonstrate prototype quantum processors comprising a few tens of quantum bits. This development also revealed …
View article: Interplay Between Kinetic Inductance, Nonlinearity, and Quasiparticle Dynamics in Granular Aluminum Microwave Kinetic Inductance Detectors
Interplay Between Kinetic Inductance, Nonlinearity, and Quasiparticle Dynamics in Granular Aluminum Microwave Kinetic Inductance Detectors Open
Microwave kinetic inductance detectors (MKIDs) are thin film, cryogenic,\nsuperconducting resonators. Incident Cooper pair-breaking radiation increases\ntheir kinetic inductance, thereby measurably lowering their resonant frequency.\nFor a…
View article: Additional data for the dissertation: Resolving locations of defects in superconducting transmon qubits
Additional data for the dissertation: Resolving locations of defects in superconducting transmon qubits Open
View article: Resolving locations of defects in superconducting transmon qubits
Resolving locations of defects in superconducting transmon qubits Open
Despite tremendous progress of quantum computation with superconducting qubits, up-scaling for practical applications is hindered by decoherence and fluctuations induced by material defects. In this work, a qubit interface has been develop…