A. Dunsworth

Demonstration of dynamic surface codes

Alec Eickbusch, Matt McEwen, Volodymyr Sivak, Alexandre Bourassa et autres

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 checks, permitting correction of logical information. Recently, the development of …

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Scaling and logic in the color code on a superconducting quantum processor

Nathan Lacroix, Alexandre Bourassa, Francisco J. H. Heras, Lei M. Zhang et autres

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 processors have focused primarily on the surface code, which offers …

Demonstrating dynamic surface codes

Alec Eickbusch, Matt McEwen, Volodymyr Sivak, Alexandre Bourassa et autres

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 checks, permitting correction of logical information. Recently, the development of …

Quantum error correction below the surface code threshold

Rajeev Acharya, Dmitry A. Abanin, Laleh Aghababaie-Beni, I. L. Aleǐner et autres

Quantum error correction [1, 2, 3, 4] 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 exponential suppression only …

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Resisting High-Energy Impact Events through Gap Engineering in Superconducting Qubit Arrays

Matt McEwen, Kevin C. Miao, Juan Atalaya, Alexander Bilmes et autres

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 arrays, high-energy impact events can produce correlated errors, violating this …

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Phase transitions in random circuit sampling

Alexis Morvan, Benjamin Villalonga, Xiao Mi, Salvatore Mandrà et autres

Undesired coupling to the surrounding environment destroys long-range correlations in quantum processors and hinders coherent evolution in the nominally available computational space. This noise is an outstanding challenge when leveraging the computation power of near-term quantum processors1. It has been shown that …

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Data for "Observation of disorder-free localization using a (2+1)D lattice gauge theory on a quantum processor"

Gaurav Gyawali, Aaron Szasz, Tyler A. Cochran, Amir H. Karamlou et autres

Disorder-induced phenomena in quantum many-body systems pose significant challenges for analytical methods and numerical simulations at relevant time and system scales. To reduce the cost of disorder-sampling, we investigate quantum circuits initialized in states tunable to superpositions over all disorder configurations. In …

Quantum error correction below the surface code threshold

Rajeev Acharya, Laleh Aghababaie-Beni, I. L. Aleǐner, Trond I. Andersen et autres

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 exponential suppression only occurs if the physical …

Thermalization and Criticality on an Analog-Digital Quantum Simulator

Trond I. Andersen, Nikita Astrakhantsev, Amir H. Karamlou, Julia Berndtsson et autres

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 evolution, and extensive probes for final state characterization. We present a …

Dynamics of magnetization at infinite temperature in a Heisenberg spin chain

Eliott Rosenberg, T. I. Andersen, Rhine Samajdar, A. Petukhov et autres

Understanding universal aspects of quantum dynamics is an unresolved problem in statistical mechanics. In particular, the spin dynamics of the one-dimensional Heisenberg model were conjectured as to belong to the Kardar-Parisi-Zhang (KPZ) universality class based on the scaling of the infinite-temperature spin-spin …

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Stable quantum-correlated many-body states through engineered dissipation

Xiao Mi, Alexios A. Michailidis, S. Shabani, Kevin C. Miao et autres

Engineered dissipative reservoirs have the potential to steer many-body quantum systems toward correlated steady states useful for quantum simulation of high-temperature superconductivity or quantum magnetism. Using up to 49 superconducting qubits, we prepared low-energy states of the transverse-field Ising model through coupling …

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Optimizing quantum gates towards the scale of logical qubits

Paul V. Klimov, Andreas Bengtsson, Chris Quintana, Alexandre Bourassa et autres

A foundational assumption of quantum error correction theory is that quantum gates can be scaled to large processors without exceeding the error-threshold for fault tolerance. Two major challenges that could become fundamental roadblocks are manufacturing high-performance quantum hardware and engineering a control …

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