Nonequilibrium fluctuations in boson transport through squeezed reservoirs

TL;DR

This paper investigates how quantum squeezing influences nonequilibrium fluctuations in bosonic transport between squeezed reservoirs, revealing unique effects on cumulants and steady-state fluctuation theorems.

Contribution

It introduces a full counting statistics approach to analyze squeezing effects on bosonic transport, deriving new relations for cumulants and thermodynamic affinity.

Findings

Odd cumulants are independent of squeezing under symmetric conditions.

Even cumulants increase with squeezing compared to unsqueezed reservoirs.

A steady state fluctuation theorem with squeezing-dependent affinity is established.

Abstract

We explore the effects of quantum mechanical squeezing on the nonequilibrium fluctuations of bosonic transport between two squeezed harmonic reservoirs and a two level system. A standard full counting statistics technique based on a quantum master equation is employed. We derive a nonzero thermodynamic affinity under equal temperature setting of the two squeezed reservoirs. The odd cumulants are shown to be independent of squeezing under symmetric conditions, whereas the even cumulants depend nonlinearly on the squeezing parameters. The odd and even cumulants saturate at two different but unique values which are identified analytically. Further, squeezing always increases the magnitude of the even cumulants in comparison to the unsqueezed case. We also recover a steady state fluctuation theorem with squeezing dependent thermodynamic affinity and demonstrate the robustness of a steadystate thermodynamic uncertainty relationship.