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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Accesso online: | https://arxiv.org/abs/2409.15085 |
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| _version_ | 1866929608760229888 |
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| author | Lairez, Didier |
| author_facet | Lairez, Didier |
| contents | Landauer's "principle" claims that erasing one bit of information necessarily dissipates at least Tln2 of heat into the surroundings, making a possibly logically irreversible operation also thermodynamically irreversible. It is commonly accepted that this result is a fundamental principle of physics that definitively establishes the link between information and energy. Here we show that this result cannot be general. In fact it comes: 1) from a confusion between logical and thermodynamic irreversibilities and between logical and thermodynamic states, which is reminiscent of the classic Gibbs' paradox about the joining of two volumes of the same gas; and 2) from two unnecessary constraints imposed on the erase procedure. Clarifying these points permits: to dissociate the notions of logical and thermodynamic irreversibilities; to invalidate Landauer's result as being a general physical principle; and to open the door to hardware implementations allowing erasure to follow a thermodynamically reversible, or at least quasistatic, path. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_15085 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The fundamental difference between logical and thermodynamic irreversibilities, or, Why Landauer's result cannot be a physical principle Lairez, Didier General Physics Landauer's "principle" claims that erasing one bit of information necessarily dissipates at least Tln2 of heat into the surroundings, making a possibly logically irreversible operation also thermodynamically irreversible. It is commonly accepted that this result is a fundamental principle of physics that definitively establishes the link between information and energy. Here we show that this result cannot be general. In fact it comes: 1) from a confusion between logical and thermodynamic irreversibilities and between logical and thermodynamic states, which is reminiscent of the classic Gibbs' paradox about the joining of two volumes of the same gas; and 2) from two unnecessary constraints imposed on the erase procedure. Clarifying these points permits: to dissociate the notions of logical and thermodynamic irreversibilities; to invalidate Landauer's result as being a general physical principle; and to open the door to hardware implementations allowing erasure to follow a thermodynamically reversible, or at least quasistatic, path. |
| title | The fundamental difference between logical and thermodynamic irreversibilities, or, Why Landauer's result cannot be a physical principle |
| topic | General Physics |
| url | https://arxiv.org/abs/2409.15085 |