Comment on "Entropic Costs of Extracting Classical Ticks from a Quantum Clock"
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arXiv
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866914585244598272 |
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| author | Gong, Longyan |
| author_facet | Gong, Longyan |
| contents | A recent Letter by Wadhia et al. reports a realization of a quantum clock using a double quantum dot (DQD) [Phys. Rev. Lett. 135, 200407 (2005)]. This Comment identifies two fundamental issues: (I) the claimed ``quantum clock" exhibits only classical behavior and lacks intrinsic temporal correlations between ticks; it is not sufficient for accurate time as a good clock. (II) the thermodynamic analysis misassigns entropy production and conflates amplification with measurement; the reported combined entropy is an engineering dissipation, not a fundamental cost of quantum timekeeping. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_21833 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Comment on "Entropic Costs of Extracting Classical Ticks from a Quantum Clock" Gong, Longyan Mesoscale and Nanoscale Physics Quantum Physics A recent Letter by Wadhia et al. reports a realization of a quantum clock using a double quantum dot (DQD) [Phys. Rev. Lett. 135, 200407 (2005)]. This Comment identifies two fundamental issues: (I) the claimed ``quantum clock" exhibits only classical behavior and lacks intrinsic temporal correlations between ticks; it is not sufficient for accurate time as a good clock. (II) the thermodynamic analysis misassigns entropy production and conflates amplification with measurement; the reported combined entropy is an engineering dissipation, not a fundamental cost of quantum timekeeping. |
| title | Comment on "Entropic Costs of Extracting Classical Ticks from a Quantum Clock" |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2605.21833 |