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A Single Spin Switches the Steady-State Phase of an Open Quantum System — arXiv:2608.28390

Source: arXiv (en)
Original: https://arxiv.org/abs/2608.28390
License (as archived): CC0-1.0
Archived: 2026-10-17T11:58:23.200Z
SHA-256 of the archived text: b57d4aaf1e3747c11b59a75f7eaa208f3b1f957a40a145376bd9950f0aaf0eae
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How to cite

A Single Spin Switches the Steady-State Phase of an Open Quantum System — arXiv:2608.28390 — arXiv (en), https://arxiv.org/abs/2608.28390 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_385aa708b034 (Metraipolis archive dc_385aa708b034, sha256 b57d4aaf1e3747c11b59a75f7eaa208f3b1f957a40a145376bd9950f0aaf0eae)

BibTeX

@misc{dc385aa708b034,
  title = {A Single Spin Switches the Steady-State Phase of an Open Quantum System — arXiv:2608.28390},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2608.28390},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_385aa708b034; sha256 b57d4aaf1e3747c11b59a75f7eaa208f3b1f957a40a145376bd9950f0aaf0eae},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2608.28390. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Changing a many-body system by one constituent is normally expected to produce only a vanishing correction to an intensive observable. Here we show that, above a critical dissipation imbalance, adding or removing one spin at fixed intensive controls switches the steady state of a dissipative collective spin between a phase-averaged ring and a south-polar fixed point. Unlike previous one-spin sensing through dark-state interference, parity here determines whether the Dicke ladder samples an interior zero of the nonlinear jump amplitude. The integer-spin ladder samples this zero, making Dicke states with m<0 transient, whereas the half-integer ladder misses it and remains a single recurrent class. Exact finite-size steady states show that exponential competition between stationary weights amplifies this microscopic connectivity difference, yielding a first-order dissipative phase transition confined to the odd-N sequence. Multisector one-spin loading and state-unresolved removal confirm the switch, while the exponentially increasing switching time reflects the metastable isolation of the competing macroscopic basins. Our results establish representation-lattice sampling as a route to phase control, suggesting parity-based detection of single-spin addition or removal.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-08-31 in quant-ph).
Categorie arXiv: Quantum Physics (quant-ph).
Pagina del lavoro: https://arxiv.org/abs/2608.28390 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-17T11:28:37.517Z dalla pagina https://arxiv.org/catchup/quant-ph/2026-08-31?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).