Quantum

Finite-resource cooling of qudits beyond thermodynamic length

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 02/11/2026, 05:13:24 UTC.

Briefings

A new arXiv preprint (2610.40709v1) proposes that cooling quantum systems using $N$ thermal machines exceeds Landauer's bound, with excess cost determined by 'thermodynamic length.' The study identifies optimal energy eigenstate permutations for qudits, reducing excess by up to 83% near the ground state, while noting coherent collisions and infinite-temperature $d_M$-level machines offer limited improvements.

Key points

• Cooling a quantum system with $N$ thermal machines costs more than Landauer's bound, with excess determined by thermodynamic length.
• Optimal energy eigenstate permutations for qudits reduce excess by up to 83% near the ground state.

Context

This research addresses the thermodynamic cost of quantum cooling, suggesting that standard Landauer bounds are insufficient for multi-machine systems. The findings provide a framework for optimizing energy state permutations to minimize resource consumption in quantum protocols.

Limitations

The study is a preprint (arXiv:2610.40709v1) with no peer review. Results are limited to specific swap-based collision models and qudits; performance at infinite temperature and for $d_M$-level machines remains unverified.

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