# Second law for an autonomous information machine connected with multiple baths

## TL;DR

This paper derives a generalized second law of thermodynamics for an autonomous information machine connected to multiple heat baths and an information reservoir, ensuring thermodynamic consistency.

## Contribution

It introduces a new second law formulation for systems with multiple baths and an information reservoir, tightening previous bounds on entropy production.

## Key findings

- Bath entropy production is limited by the change in Shannon entropy of the system and reservoir.
- The derived bound is shown to be tighter than previous bounds.
- Examples demonstrate the applicability of the new second law formulation.

## Abstract

In an Information machine system's dynamics gets affected by the attached information reservoir. Second law of thermodynamics can be apparently violated for this case. In this article we have derived second law for an information machine, when the system is connected to multiple heat baths along with a work source and a single information reservoir. Here a sequence of bits written on a tape is considered as an information reservoir. We find that the bath entropy production during a time interval is restricted by the change of Shannon entropy of the composite system (system + information reservoir) during that interval. We have also given several examples where this law can be applicable and shown that our bound is tighter.