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Distributed Quantum Sensing with Multimode N00N States.

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This study introduces distributed quantum sensing using multimode N00N states for enhanced parameter estimation. The new method achieves Heisenberg scaling, improving sensitivity in quantum sensor networks.

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Area of Science:

  • Quantum Information Science
  • Quantum Metrology
  • Distributed Sensing

Background:

  • Distributed quantum sensing estimates global parameters across multiple nodes.
  • N00N states offer optimal Heisenberg scaling for quantum metrology.
  • Multimode N00N states extend N00N states for multi-parameter estimation.

Purpose of the Study:

  • To explore the application of multimode N00N states in distributed quantum sensing.
  • To develop a distributed quantum sensing scheme achieving Heisenberg scaling.
  • To experimentally demonstrate the proposed scheme and quantify sensitivity enhancement.

Main Methods:

  • Theoretical analysis using Cramér-Rao and quantum Cramér-Rao bounds.
  • Utilizing multimode N00N states, specifically a four-mode 2002 state.
  • Experimental estimation of spatially distributed phases.

Main Results:

  • Multimode N00N states achieve Heisenberg scaling in distributed sensing.
  • A 2.74 dB sensitivity enhancement over the standard quantum limit was demonstrated.
  • The proposed scheme successfully estimates average distributed phases.

Conclusions:

  • Multimode N00N states are effective for distributed quantum sensing.
  • This approach offers a promising path for entanglement-enhanced sensor networks.
  • Heisenberg scaling is achievable in distributed sensing with multimode N00N states.