Quantum Enhanced Sensitivity through Many-Body Bloch Oscillations

Hassan Manshouri; Moslem Zarei; Mehdi Abdi; Sougato Bose; Abolfazl Bayat

doi:10.22331/q-2025-07-11-1793

Quantum Enhanced Sensitivity through Many-Body Bloch Oscillations

Hassan Manshouri¹, Moslem Zarei¹, Mehdi Abdi², Sougato Bose³, and Abolfazl Bayat^4,5

¹Department of Physics, Isfahan University of Technology, Isfahan 84156-83111, Iran
²Wilczek Quantum Center, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
³Department of Physics and Astronomy, University College London, Gower Street, WC1E6BT, London, United Kingdom
⁴Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
⁵Key Laboratory of Quantum Physics and Photonic Quantum Information, Ministry of Education, University of Electronic Science and Technology of China, Chengdu 611731, China

Published:	2025-07-11, volume 9, page 1793
Editor:	Christos Gagatsos
Eprint:	arXiv:2406.13921v4
Doi:	https://doi.org/10.22331/q-2025-07-11-1793
Citation:	Quantum 9, 1793 (2025).

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Abstract

We investigate the sensing capacity of non-equilibrium dynamics in quantum systems exhibiting Bloch oscillations. By focusing on the resource efficiency of the probe, quantified by quantum Fisher information, we find different scaling behaviors in two different phases, namely localized and extended. Our results provide a quantitative ansatz for quantum Fisher information in terms of time, probe size, and the number of excitations. In the long-time regime, the quantum Fisher information is a quadratic function of time, touching the Heisenberg limit. The system size scaling drastically depends on the phase changing from quantum-enhanced scaling in the extended phase to size-independent behavior in the localized phase. Furthermore, increasing the number of excitations always enhances the precision of the probe, although, in the interacting systems the enhancement becomes less eminent than the non-interacting probes. This is due to the induced localization by increasing the interaction between the excitations. We show that a simple particle configuration measurement together with a maximum likelihood estimation can closely reach the ultimate precision limit in both single- and multi-particle probes.

► BibTeX data

@article{Manshouri2025quantumenhanced,
  doi = {10.22331/q-2025-07-11-1793},
  url = {https://doi.org/10.22331/q-2025-07-11-1793},
  title = {Quantum {E}nhanced {S}ensitivity through {M}any-{B}ody {B}loch {O}scillations},
  author = {Manshouri, Hassan and Zarei, Moslem and Abdi, Mehdi and Bose, Sougato and Bayat, Abolfazl},
  journal = {{Quantum}},
  issn = {2521-327X},
  publisher = {{Verein zur F{\"{o}}rderung des Open Access Publizierens in den Quantenwissenschaften}},
  volume = {9},
  pages = {1793},
  month = jul,
  year = {2025}
}

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