Online identification of symmetric pure states

Gael Sentís; Esteban Martínez-Vargas; Ramon Muñoz-Tapia

doi:10.22331/q-2022-02-21-658

Online identification of symmetric pure states

Gael Sentís, Esteban Martínez-Vargas, and Ramon Muñoz-Tapia

Física Teòrica: Informació i Fenòmens Quàntics, Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellatera (Barcelona) Spain

Published:	2022-02-21, volume 6, page 658
Eprint:	arXiv:2107.02127v4
Doi:	https://doi.org/10.22331/q-2022-02-21-658
Citation:	Quantum 6, 658 (2022).

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Abstract

We consider online strategies for discriminating between symmetric pure states with zero error when $n$ copies of the states are provided. Optimized online strategies involve local, possibly adaptive measurements on each copy and are optimal at each step, which makes them robust in front of particle losses or an abrupt termination of the discrimination process. We first review previous results on binary minimum and zero error discrimination with local measurements that achieve the maximum success probability set by optimizing over global measurements, highlighting their online features. We then extend these results to the case of zero error identification of three symmetric states with constant overlap. We provide optimal online schemes that attain global performance for any $n$ if the state overlaps are positive, and for odd $n$ if overlaps have a negative value. For arbitrary complex overlaps, we show compelling evidence that online schemes fail to reach optimal global performance. The online schemes that we describe only require to store the last outcome obtained in a classical memory, and adaptiveness of the measurements reduce to at most two changes, regardless of the value of $n$.

► BibTeX data

@article{Sentis2022online,
  doi = {10.22331/q-2022-02-21-658},
  url = {https://doi.org/10.22331/q-2022-02-21-658},
  title = {Online identification of symmetric pure states},
  author = {Sent{\'{i}}s, Gael and Mart{\'{i}}nez-Vargas, Esteban and Mu{\~{n}}oz-Tapia, Ramon},
  journal = {{Quantum}},
  issn = {2521-327X},
  publisher = {{Verein zur F{\"{o}}rderung des Open Access Publizierens in den Quantenwissenschaften}},
  volume = {6},
  pages = {658},
  month = feb,
  year = {2022}
}

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