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Effect of Cross-Spectral Correlations on Qubit Dynamics: Coherence Revival and Relaxation Modulation — arXiv:2608.04672

Source: arXiv (en)
Original: https://arxiv.org/abs/2608.04672
License (as archived): CC0-1.0
Archived: 2026-10-31T12:01:47.108Z
SHA-256 of the archived text: 330f5d168833b8ca148be459db669b599edaf4e2ae1c08efd5ddffeb53be6184
Stable URL of this page: https://metraipolis.com/documento/dc_fbe02adabef4

How to cite

Effect of Cross-Spectral Correlations on Qubit Dynamics: Coherence Revival and Relaxation Modulation — arXiv:2608.04672 — arXiv (en), https://arxiv.org/abs/2608.04672 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_fbe02adabef4 (Metraipolis archive dc_fbe02adabef4, sha256 330f5d168833b8ca148be459db669b599edaf4e2ae1c08efd5ddffeb53be6184)

BibTeX

@misc{dcfbe02adabef4,
  title = {Effect of Cross-Spectral Correlations on Qubit Dynamics: Coherence Revival and Relaxation Modulation — arXiv:2608.04672},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2608.04672},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_fbe02adabef4; sha256 330f5d168833b8ca148be459db669b599edaf4e2ae1c08efd5ddffeb53be6184},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2608.04672. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

We investigate the reduced dynamics of a qubit subject to correlated longitudinal and transverse noise arising from its coupling to a shared bosonic bath. The environmental fluctuations are characterized by a positive-semidefinite matrix-valued spectral density, whose complex off-diagonal elements encode correlations between dephasing and relaxation channels in the frequency domain. Within the second-order time-convolutionless framework, we derive closed time-local equations for the Bloch-vector components of the reduced density matrix. The numerical implementation is validated against the exact pure-dephasing solution and the established behavior of the transverse-coupling spin-boson model. When both noise channels are present, the cross-spectral terms couple the otherwise distinct dephasing and relaxation sectors, producing dynamics that cannot be reproduced by adding independent noise contributions. In particular, the correlations generate non-monotonic population relaxation and a transient revival of coherence following its initial decay. The strength, bandwidth, delay, and phase of the cross spectrum provide control parameters for the magnitude and temporal structure of these effects. Our results demonstrate that correlated multi-axis noise can redistribute coherence loss and energy relaxation in time, thereby providing finite temporal windows of enhanced coherence or suppressed relaxation within the weak-coupling regime.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-08-06 in quant-ph).
Categorie arXiv: Quantum Physics (quant-ph).
Pagina del lavoro: https://arxiv.org/abs/2608.04672 — 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 2026-10-31T11:50:18.173Z dalla pagina https://arxiv.org/catchup/quant-ph/2026-08-06?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).