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Informationally complete distributed metrology without a shared reference frame.

Hua-Qing Xu1,2,3,4, Gong-Chu Li1,2,3,4, Xu-Song Hong1,2,3

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Researchers developed a new quantum sensing method to overcome reference frame misalignment in space. This technique recovers quantum Fisher information, enabling robust distributed quantum sensing previously hindered by fundamental restrictions.

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Area of Science:

  • Quantum Information Processing
  • Quantum Metrology
  • Quantum Communication & Sensing

Background:

  • Precise reference frame (RF) identification is crucial for quantum information processing.
  • Distributed quantum sensing faces challenges due to absent shared RFs, leading to a no-go theorem restricting information extraction.
  • RF misalignment causes decoherence-like noise, degrading sensing performance.

Purpose of the Study:

  • To circumvent the no-go theorem in RF-independent distributed metrology.
  • To enable complete recovery of quantum Fisher information (QFI) despite RF misalignment.
  • To develop practical distributed quantum sensing for space applications.

Main Methods:

  • Proposed a reversed-encoding method using two copies of local-unitary-invariant network states.
  • Applied local Bell-state measurements to saturate the QFI.
  • Mitigated decoherence-like noise stemming from RF misalignment.

Main Results:

  • Successfully circumvented the no-go theorem.
  • Achieved complete recovery of QFI, overcoming previous limitations.
  • Demonstrated that local Bell-state measurements are optimal for QFI saturation.

Conclusions:

  • The reversed-encoding method enables robust distributed quantum sensing in the presence of unknown RF misalignment.
  • Findings overcome a fundamental restriction previously precluding field applications.
  • Paves the way for practical distributed quantum sensing in space-based communication and metrology.