Beginning the second year of the project our simulation code was implemented on a 200 nodes cluster with 3 TB RAM. This allowed larger scale simulation over longer time scales. Enhanced simulations of the dynamics of a double domain nuclear spin ensemble coupled to the Nambu-Goldstone boson were undertaken with realistic parameters. The simulation reproduced the experimental observed data. Our work opens up the possibility for the exploration of novel collective behavior in solid state systems where the natural energies associated with those spins are much less than the thermal energy (published in PRB Letters).
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Next, we explored a quantum battery protocol using super radiance and absorption. This protocol using dark states to achieve both super extensive capacity and power density, with spins coupled to a reservoir. Quantum correlations are essential for this to be achieved. Further, the power density scales with the number of spins N in the battery. While connected to the charger, the charged state of the battery is a steady state, stabilized through quantum interference in the open system (published in Phys. Rev. Applied).
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We also continued our exploration of HQS for quantum simulation. We used our simulator to explore discrete time crystals, a novel state of matter, emerging in periodically driven quantum systems (ensembles of qubits). We found that a small amount of disorder results in network evolution that exhibits an emergent preferential attachment mechanism related to the existence of scale-free networks. This work was published in Science Advances.