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Area of Science:

  • Quantum Information Science
  • Quantum Metrology
  • Quantum Networks

Background:

  • Quantum networks are crucial for advancing quantum technologies.
  • Continuous-variable (CV) quantum states offer unique advantages for sensing applications.
  • Achieving Heisenberg scaling in distributed sensing is a key goal in quantum metrology.

Purpose of the Study:

  • To investigate the quantum metrological power of typical continuous-variable (CV) quantum networks.
  • To demonstrate how CV quantum networks facilitate Heisenberg scaling in distributed quantum displacement sensing.
  • To determine the robustness of this quantum enhancement against photon loss.

Main Methods:

  • Generating entangled probe states using CV quantum networks.
  • Utilizing local operations and measurements for quantum displacement sensing.
  • Numerical simulations to analyze the impact of network structure and photon loss.

Main Results:

  • Most CV quantum networks provide entanglement enabling Heisenberg scaling for distributed sensing.
  • This quantum enhancement is unattainable with unentangled probe states.
  • A tolerable photon-loss rate was identified that preserves the quantum advantage.
  • Quantum enhancement is achievable in networks of local beam splitters with sufficient depth.

Conclusions:

  • CV quantum networks are powerful tools for distributed quantum metrology.
  • Entanglement distribution via quantum networks is key to achieving Heisenberg-limited sensing.
  • The proposed scheme is robust to photon loss and adaptable to various network configurations.