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Researchers used quantum entanglement in a diamond network to improve non-local optical measurements. This quantum-enhanced sensing overcomes noise and photon loss, enabling more sensitive measurements for applications like long-baseline interferometry.

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Area of Science:

  • Quantum optics
  • Quantum information science
  • Nanophotonics

Background:

  • Non-local optical measurements face sensitivity limits due to quantum noise and photon loss, especially in long-baseline telescope arrays.
  • Distributed quantum entanglement offers a potential solution to enhance non-local sensing capabilities.

Purpose of the Study:

  • To demonstrate non-local phase measurements using entangled quantum memories in a quantum network.
  • To experimentally perform entanglement-assisted differential phase measurements of weak light between spatially separated stations.

Main Methods:

  • Utilized silicon-vacancy centers in diamond nanocavities to create entangled quantum memories.
  • Implemented event-ready remote quantum entanglement generation.
  • Employed photon mode erasure and non-local, non-destructive photon heralding.

Main Results:

  • Successfully performed entanglement-assisted differential phase measurements between two stations.
  • Demonstrated the remote phase sensing protocol over a 1.55 km fiber link.
  • Achieved enhanced sensitivity in non-local optical measurements.

Conclusions:

  • The study demonstrates a novel quantum-enhanced optical sensing protocol.
  • Results pave the way for new quantum-enhanced imaging methods.
  • Potential applications include long-baseline interferometry, astronomy, and microscopy.