Metraipolis › archive › dc_ecfcf7d613ba

Experimental activation of hidden metrological steerability in quantum channels via stochastic filtering — arXiv:2611.06668

Source: arXiv (en)
Original: https://arxiv.org/abs/2611.06668
License (as archived): CC0-1.0
Archived: 2026-11-05T18:32:59.803Z
SHA-256 of the archived text: ba92acffbd5f85430b7a0fbe3ef81dae2ccd60d9025c9bb9a05b48f67739c432
Stable URL of this page: https://metraipolis.com/documento/dc_ecfcf7d613ba

How to cite

Experimental activation of hidden metrological steerability in quantum channels via stochastic filtering — arXiv:2611.06668 — arXiv (en), https://arxiv.org/abs/2611.06668 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_ecfcf7d613ba (Metraipolis archive dc_ecfcf7d613ba, sha256 ba92acffbd5f85430b7a0fbe3ef81dae2ccd60d9025c9bb9a05b48f67739c432)

BibTeX

@misc{dcecfcf7d613ba,
  title = {Experimental activation of hidden metrological steerability in quantum channels via stochastic filtering — arXiv:2611.06668},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2611.06668},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_ecfcf7d613ba; sha256 ba92acffbd5f85430b7a0fbe3ef81dae2ccd60d9025c9bb9a05b48f67739c432},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2611.06668. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Quantum steering-assisted metrology allows a trusted party (Bob) to improve local phase estimation by exploiting classical information communicated by an untrusted party (Alice). In realistic scenarios, however, the channel is subject to noise that degrades steerability and suppresses the associated metrological advantage. Here, we demonstrate that stochastic pre- and post-filtering operations can revive the violation of the metrological steering inequality (MSI) in phase-covariant amplitude-damping channels where it is initially absent, thereby activating a hidden metrological steerability and restoring their usefulness for quantum metrology. Specifically, the critical damping parameter beyond which the MSI violation is suppressed is raised from $\gamma_c \approx 0.5$ to $\gamma_c \approx 0.75$ for the largest filter strength considered. We verify this in a photonic experiment, where polarization qubits carrying the encoded phase are transmitted through an amplitude-damping channel implemented with a two-path Sagnac interferometer, and the stochastic operations are realized with glass plates at the Brewster angle. By tuning the filter strength and scanning the damping parameter over its full range, we observe the revival of the MSI violation, obtained at the cost of a reduced success probability inherent to the stochastic nature of the filtering operations. Our results establish that metrological utility and steerability can be activated through stochastic operations even when these properties are absent in the original noisy channel, extending filtering-based activation from witnesses of nonclassicality to a certified and operationally quantified metrological advantage.

Tema degli esploratori: fisica e astronomia (elenco arXiv quant-ph, nuovi lavori del giorno).
Categorie arXiv: Quantum Physics (quant-ph).
Pagina del lavoro: https://arxiv.org/abs/2611.06668 — 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 2026-11-05T18:22:49.024Z dalla pagina https://arxiv.org/list/quant-ph/new (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).