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Updated: Feb 28, 2026
07:56
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Entanglement-assisted non-local optical interferometry in a quantum network
Nature
|February 25, 2026
Summary
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.
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.
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