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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Entangling Macroscopic Light States by Delocalized Photon Addition.
Nicola Biagi1, Luca S Costanzo1, Marco Bellini1
1Istituto Nazionale di Ottica (CNR-INO), L.go E. Fermi 6, 50125 Florence, Italy and LENS and Department of Physics & Astronomy, University of Firenze, 50019 Sesto Fiorentino, Florence, Italy.
Physical Review Letters
|February 8, 2020
Summary
Researchers demonstrate a novel method for entangling multiple light fields using single photon addition. This technique shows promise for robust entanglement, even with intense light states and losses.
Area of Science:
- Quantum optics
- Quantum information science
Background:
- Entanglement is a key quantum phenomenon essential for quantum information processing.
- Existing methods for entangling light states face challenges with intensity and photon loss.
Purpose of the Study:
- To develop a robust scheme for entangling multiple distinct field modes with arbitrary light states.
- To experimentally verify the proposed entanglement scheme.
Main Methods:
- Utilizing a delocalized heralded addition of a single photon.
- Implementing the scheme to entangle two identical weak laser pulses.
Main Results:
- Successfully established and measured significant entanglement between two weak laser pulses.
- Demonstrated entanglement in light states containing up to 60 photons each.
- The proposed scheme is theoretically robust against losses and high-intensity light states.
Conclusions:
- The single-photon addition scheme provides a viable route to robust multi-mode light field entanglement.
- This method has potential applications in quantum communication and computation.
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