In small lattice lambda phi^4 theory, a highly occupied coherent field produces particles and relaxes to the diagonal-ensemble values for a finite time before quantum recurrences appear, and the dynamics maps efficiently onto quantum circuits.
Quantum simulation of thermal field theories
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abstract
We present our recent studies on thermal field theories using quantum algorithms. We first delve into the representation of quantum fields via qubits on general digital quantum computers alongside the quantum algorithms employed to evaluate thermal properties of generic quantum field theories. Then, we show our numerical results of thermal field theories in 1+1 dimensions using quantum simulators. Both fermion and scalar fields will be discussed. These studies aim to understand thermal fixed points for our forthcoming work on studying thermalisation in quantum field theories in real time quantum simulation.
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Particle Production, Equilibration, and Quantum Recurrences from Classical Fields
In small lattice lambda phi^4 theory, a highly occupied coherent field produces particles and relaxes to the diagonal-ensemble values for a finite time before quantum recurrences appear, and the dynamics maps efficiently onto quantum circuits.