Real-time EFT expresses work distribution functions for a driven thermal bath plus qubit in terms of the quasiparticle spectral function, yielding second-order results that favor spin/topological qubits for work extraction.
Wick's Theorem at Finite Temperature
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abstract
We consider Wick's Theorem for finite temperature and finite volume systems. Working at an operator level with a path ordered approach, we show that contrary to claims in the literature, expectation values of normal ordered products can be chosen to be zero and that results obtained are independent of volume. Thus the path integral and operator approaches to finite temperature and finite volume quantum field theories are indeed seen to be identical. The conditions under which normal ordered products have simple symmetry properties are also considered.
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Work Statistics via Real-Time Effective Field Theory: Application to Work Extraction from Thermal Bath with Qubit Coupling
Real-time EFT expresses work distribution functions for a driven thermal bath plus qubit in terms of the quasiparticle spectral function, yielding second-order results that favor spin/topological qubits for work extraction.