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Area of Science:

  • Quantum physics
  • Metrology
  • Quantum sensing

Background:

  • Distributed quantum metrology offers enhanced parameter estimation beyond classical limits.
  • Current methods often require a high number of entangled photons, limiting scalability.

Purpose of the Study:

  • To present a novel distributed quantum sensing scheme.
  • To achieve quantum-enhanced sensitivity with fewer photons than parameters.
  • To demonstrate the feasibility of large-scale distributed quantum sensing.

Main Methods:

  • Utilized a two-photon entangled state for distributed phase estimation.
  • Experimentally demonstrated the scheme over a 3 km distance.
  • Compared results against the standard quantum limit.

Main Results:

  • Achieved quantum-enhanced sensitivity with fewer photons than parameters.
  • Demonstrated a 2.2 dB sensitivity enhancement beyond the standard quantum limit.
  • Confirmed Heisenberg scaling is possible under these conditions.

Conclusions:

  • The proposed scheme overcomes the photon-number limitation of previous methods.
  • Enables practical, large-scale distributed quantum sensing using current entangled sources.
  • Paves the way for advancements in quantum metrology and sensing networks.