---
_id: '66640'
abstract:
- lang: eng
  text: "<jats:p>\r\n                    We develop a framework for identifying nonclassical
    speedups in systems with polarization, likewise spin degrees of freedom. By confining
    the dynamics to the manifold of angular momentum coherent states, which act as
    the classical reference in this case, we compute the speed limit that bounds the
    rate of change of the state achievable without generating quantum coherence. A
    comparison with the unrestricted quantum speed limit enables the quantitative
    identification of speedups arising from polarization nonclassicality. We apply
    this framework to the cross-Kerr interaction, demonstrating a persistent speedup
    scaling as\r\n                    <a:math xmlns:a=\"http://www.w3.org/1998/Math/MathML\">\r\n
    \                     <a:mrow>\r\n                        <a:mi mathvariant=\"script\">O</a:mi>\r\n
    \                       <a:mo>(</a:mo>\r\n                        <a:msqrt>\r\n
    \                         <a:mi>N</a:mi>\r\n                        </a:msqrt>\r\n
    \                       <a:mo>)</a:mo>\r\n                      </a:mrow>\r\n
    \                   </a:math>\r\n                    with the photon number\r\n
    \                   <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\">\r\n
    \                     <c:mi>N</c:mi>\r\n                    </c:math>\r\n                    ,
    with a parity effect in favor of even photon numbers. The results establish polarization
    nonclassicality as a genuine dynamical resource, linking quantum coherence to
    quantum-enhanced evolution speeds in nonlinear photonic systems.\r\n                  </jats:p>"
article_number: L032018
author:
- first_name: Tim
  full_name: Aßbrock, Tim
  last_name: Aßbrock
- first_name: Jan
  full_name: Sperling, Jan
  id: '75127'
  last_name: Sperling
  orcid: 0000-0002-5844-3205
- first_name: Laura
  full_name: Ares, Laura
  last_name: Ares
citation:
  ama: Aßbrock T, Sperling J, Ares L. Quantum speedup from nonclassical polarization.
    <i>Physical Review Research</i>. 2026;8(3). doi:<a href="https://doi.org/10.1103/mflc-2mzq">10.1103/mflc-2mzq</a>
  apa: Aßbrock, T., Sperling, J., &#38; Ares, L. (2026). Quantum speedup from nonclassical
    polarization. <i>Physical Review Research</i>, <i>8</i>(3), Article L032018. <a
    href="https://doi.org/10.1103/mflc-2mzq">https://doi.org/10.1103/mflc-2mzq</a>
  bibtex: '@article{Aßbrock_Sperling_Ares_2026, title={Quantum speedup from nonclassical
    polarization}, volume={8}, DOI={<a href="https://doi.org/10.1103/mflc-2mzq">10.1103/mflc-2mzq</a>},
    number={3L032018}, journal={Physical Review Research}, publisher={American Physical
    Society (APS)}, author={Aßbrock, Tim and Sperling, Jan and Ares, Laura}, year={2026}
    }'
  chicago: Aßbrock, Tim, Jan Sperling, and Laura Ares. “Quantum Speedup from Nonclassical
    Polarization.” <i>Physical Review Research</i> 8, no. 3 (2026). <a href="https://doi.org/10.1103/mflc-2mzq">https://doi.org/10.1103/mflc-2mzq</a>.
  ieee: 'T. Aßbrock, J. Sperling, and L. Ares, “Quantum speedup from nonclassical
    polarization,” <i>Physical Review Research</i>, vol. 8, no. 3, Art. no. L032018,
    2026, doi: <a href="https://doi.org/10.1103/mflc-2mzq">10.1103/mflc-2mzq</a>.'
  mla: Aßbrock, Tim, et al. “Quantum Speedup from Nonclassical Polarization.” <i>Physical
    Review Research</i>, vol. 8, no. 3, L032018, American Physical Society (APS),
    2026, doi:<a href="https://doi.org/10.1103/mflc-2mzq">10.1103/mflc-2mzq</a>.
  short: T. Aßbrock, J. Sperling, L. Ares, Physical Review Research 8 (2026).
date_created: 2026-08-03T16:26:49Z
date_updated: 2026-08-03T16:28:48Z
department:
- _id: '623'
- _id: '15'
- _id: '170'
- _id: '706'
doi: 10.1103/mflc-2mzq
intvolume: '         8'
issue: '3'
language:
- iso: eng
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Quantum speedup from nonclassical polarization
type: journal_article
user_id: '75127'
volume: 8
year: '2026'
...