Approaching the Landauer Bound without Slowing Down

Abstract:Finite-time memory erasure is conventionally understood to incur an additional energy cost beyond the Landauer bound. Whether this bound can be approached without taking the infinite-time limit remains open. Based on a quantum speed limit, we identify coherence between degenerate states as a resource that allows the Landauer bound to be approached at a finite operation time. For both the $2N$-state and collective spin models, we show that the minimum dissipated heat and the heat generated by continuous protocols approach the Landauer bound at finite operation times, with the corresponding finite-time penalty scaling inversely with system size. We further validate these theoretical predictions numerically for systems coupled to the Ohmic bosonic heat bath with various driving protocols. Our results reveal that operation time is a substitutable resource for approaching the fundamental thermodynamic bound of information erasure.

Quantum Physics (quant-ph); Statistical Mechanics (cond-mat.stat-mech)

arXiv:2407.03096 [quant-ph]

(or arXiv:2407.03096v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2407.03096 Focus to learn more arXiv-issued DOI via DataCite

arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website.

Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them.

Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs.