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Simulating large-size quantum spin chains on cloud-based superconducting quantum computers
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Quantum Many-Body Jarzynski Equality and Dissipative Noise on a Digital Quantum Computer
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Double Braiding Majoranas for Quantum Computing and Hamiltonian Engineering
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Quantum Computer Systems for Scientific Discovery
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Cluster States from Gaussian States: Essential Diagnostic Tools for Continuous-Variable One-Way Quantum Computing
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Preparing Bethe Ansatz Eigenstates on a Quantum Computer
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Topological Order, Quantum Codes, and Quantum Computation on Fractal Geometries
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Layer VQE: A Variational Approach for Combinatorial Optimization on Noisy Quantum Computers
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Quantum Vulnerability Analysis to Guide Robust Quantum Computing System Design
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Quantum computation solves a half-century-old enigma: Elusive vibrational states of magnesium dimer found
The high-lying vibrational states of the magnesium dimer (Mg 2 ), which has been recognized as an important system in studies of ultracold and collisional phenomena, have eluded experimental characterization for half a century. Until now, only the first 14 vibrational states of Mg 2 have been experimentally resolved, although it has been suggested that the ground-state potential may support five additional levels. Here, we present highly accurate ab initio potential energy curves based on state-of-the-art coupled-cluster and full configuration interaction computations for the ground and excited electronic states involved in the experimental investigations of Mg 2 . Our ground-state potential unambiguously confirms the existence of 19 vibrational levels, with ~1 cm -1 root mean square deviation between the calculated rovibrational term values and the available experimental and experimentally derived data. Our computations reproduce the latest laser-induced fluorescence spectrum and provide guidance for the experimental detection of the previously unresolved vibrational levels.
Octet: A coherent qubit control system for trapped-ion quantum computers
This is firmware and software designed for a Zynq UltraScale+ RFSoC chip made by Xilinx, specifically targeted to laser-based individual addressing of trapped ion qubits via a multi-channel AOM. The design features 8 dual-tone outputs with frequencies up to 409 MHz that can be controlled statically or dynamically via on-chip cubic spline interpolation engines that allow one to generate sequences of output waveforms with fast modulation of frequency, phase, amplitude, and z-rotations that are smooth/discrete and can run simultaneously across all parameters/tones. It also features global phase alignment on all tones regardless of frequency and the ability to return to a known phase/frequency at any later time on a per-tone basis without the need for manual bookkeeping. Acoustic and optical cross-talk can also be destructively canceled by adding neighboring outputs with variable amplitude/phase/delay. Each tone can be optionally frequency locked to an external RF source. SAND2020-12703 M Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.
Quantum computing using ultracolde neutrons (UCN) [Slides]
On Dec. 2, 1942, Fermi & his team achieved sustained chain reaction, and the first fission reactor. Key elements: fuel, neutron moderator, control rod, neutron detector, and radioactivity detector.
Quantum Computing for Neutrino-nucleus Scattering with NISQ Devices [Slides]
Abstract not provided.