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Modular Many-Body Quantum Sensors.

Chiranjib Mukhopadhyay1, Abolfazl Bayat1

  • 1Institute of Fundamental and Frontier Sciences, <a href="https://ror.org/04qr3zq92">University of Electronic Sciences and Technology of China</a>, Chengdu 611731, China and Key Laboratory of Quantum Physics and Photonic Quantum Information, Ministry of Education, <a href="https://ror.org/04qr3zq92">University of Electronic Sciences and Technology of China</a>, Chengdu 611731, China.

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|October 7, 2024
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Summary
This summary is machine-generated.

Researchers developed a modular approach to create multiple quantum phase transitions, expanding the region for quantum-enhanced sensing precision. This method improves both symmetry-breaking and topological quantum sensors, achieving Heisenberg scaling for parameter estimation.

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Area of Science:

  • Quantum physics
  • Quantum sensing
  • Condensed matter theory

Background:

  • Quantum many-body systems near phase transitions offer enhanced sensing precision.
  • Current methods are limited to narrow critical regions.
  • Developing methods to broaden quantum-enhanced sensing is crucial.

Purpose of the Study:

  • To systematically develop a modular approach for introducing multiple phase transitions in quantum many-body systems.
  • To enlarge the region of quantum-enhanced precision by utilizing newly created phase boundaries.
  • To apply this approach to both symmetry-breaking and topological quantum sensors.

Main Methods:

  • Systematic modular construction of many-body systems.
  • Introduction of multiple phase transitions.
  • Analysis of symmetry-breaking and topological quantum sensors.

Main Results:

  • Successfully enlarged the region of quantum-enhanced precision by creating multiple phase boundaries.
  • Demonstrated that new critical points in symmetry-breaking sensors inherit original universality classes.
  • Showcased a rich phase diagram in topological sensors due to multiple band creation.
  • Achieved Heisenberg scaling for Hamiltonian parameter estimation at all phase boundaries.

Conclusions:

  • The modular approach effectively expands quantum-enhanced sensing regions.
  • The method is versatile, applicable to diverse quantum sensor types.
  • This work enables the creation of global sensors with superior performance over uniform probes.