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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Heralding two-photon and four-photon path entanglement on a chip
Jonathan C F Matthews1, Alberto Politi, Damien Bonneau
1Centre for Quantum Photonics, H H Wills Physics Laboratory & Department of Electrical and Electronic Engineering, University of Bristol, Bristol, United Kingdom.
Physical Review Letters
|November 24, 2011
Summary
Researchers demonstrate heralded generation of multiphoton entanglement for quantum metrology. This method creates robust NOON states for enhanced precision measurements, even with photon loss.
Area of Science:
- Quantum optics
- Quantum information science
- Integrated photonics
Background:
- Quantum entanglement is crucial for advanced quantum technologies.
- Quantum metrology aims for precision beyond classical limits.
- Heralded entanglement generation is key for controlled quantum state preparation.
Purpose of the Study:
- To investigate heralded generation of multiphoton entanglement.
- To utilize reconfigurable integrated waveguides for quantum metrology.
- To analyze the heralding process for NOON states.
Main Methods:
- Using a reconfigurable integrated waveguide device.
- Employing projective measurement of auxiliary photons to herald entanglement.
- Analyzing four- and six-photon inputs for two- and four-photon NOON states.
Main Results:
- Demonstrated heralded generation of path-entangled states.
- Analyzed the heralding process for two- and four-photon NOON states.
- Showcased phase superresolution robust to photon loss.
Conclusions:
- Heralded generation of multiphoton entanglement is feasible using integrated photonics.
- NOON states enable phase supersensitive measurements at the Heisenberg limit.
- The demonstrated method offers robustness against photon loss for practical quantum metrology.
