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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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From Scattering Amplitudes to Classical Potentials in the Post-Minkowskian Expansion
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Magnetic Excitations of the Classical Spin Liquid MgCr 2 O 4
This manuscripts describes a comprehensive neutron spectroscopy experiment aiming at understanding the behavior of magnetic moments in an exotic material, MgCr 2 O 4 , which behaves as a spin-liquid.
Hidden Plaquette Order in a Classical Spin Liquid Stabilized by Strong Off-Diagonal Exchange
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Universality in the Classical Limit of Massless Gravitational Scattering
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Falsifiability Test for Classical Nucleation Theory
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Optimal Conversion from Classical to Quantum Randomness via Quantum Chaos
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Quantum-classical crossover in the spin- 1 2 Heisenberg-Kitaev kagome magnet
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Conditional emergence of classical domain and branching of quantum histories
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Partially disordered state with short-range spin correlation in S = 5 / 2 classical triangular antiferromagnet Ag 2 FeO 2
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Reversible to irreversible transitions in periodic driven many-body systems and future directions for classical and quantum systems
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Qubit entanglement generated by classical light driving an optical cavity
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Quantum Versus Classical Spin Fragmentation in Dipolar Kagome Ice Ho 3 Mg 2 Sb 3 O 14
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Exponential Quantum Speedup in Simulating Coupled Classical Oscillators
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Classical Non-Markovian Noise in Symmetry-Preserving Quantum Dynamics
In quantum dynamics, symmetries are vital for identifying and assessing conserved quantities that govern the evolution of a quantum system. When promoted to the open quantum system setting, dynamical symmetries can be negatively altered by system-environment interactions, thus, complicating their analysis. Previous work on noisy symmetric quantum dynamics has focused on the Markovian setting, despite the ubiquity of non-Markovian noise in a number of widely used quantum technologies. Here, in this Letter, we develop a framework for quantifying the impact of non-Markovian noise on symmetric quantum evolution via root space decompositions and the filter function formalism. We demonstrate analytically that symmetry-preserving noise maintains the symmetric subspace, while nonsymmetric noise leads to highly specific leakage errors that are block diagonal in the symmetry representation. We support our findings with numerical studies of a transverse-field Ising model and a quantum error detecting code subject to spatiotemporally correlated multiaxis noise. Our results are broadly applicable, providing new analytic insights into the control and characterization of open quantum system dynamics.
The National Quantum Initiative Will Also Benefit Classical Computers [Rebooting Computing]
The U.S. National Quantum Initiative places quantum computer scaling in the same category as Moore's law. While the technical basis of semiconductor scale up is well known, the equivalent principle for quantum computers is still being developed here. Let's explore these new ideas.