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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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Local Versus Global Two-Photon Interference in Quantum Networks
Thomas Nitsche1, Syamsundar De1, Sonja Barkhofen1
1Applied Physics, Paderborn University, Warburger Straße 100, 33098 Paderborn, Germany.
Physical Review Letters
|December 4, 2020
Summary
We developed a method to control quantum interference of two-photon states in a network. This allows engineering distinct interference patterns by manipulating single photons, enabling distributed quantum interference.
Area of Science:
- Quantum optics
- Quantum information science
- Photonic networking
Background:
- Two-photon interference is fundamental to quantum information processing.
- Understanding interference in multi-mode networks is crucial for quantum technologies.
- Classical and quantum interference phenomena can exhibit complex interplay.
Purpose of the Study:
- To characterize the interplay between classical and quantum interference of two-photon states in a multi-mode network.
- To demonstrate coherent control over the global mode structure of photons.
- To engineer distinct two-photon interference patterns for different detection schemes.
Main Methods:
- Devised an approach to control phases of delocalized single photons.
- Manipulated the global mode structure of a network comprising multiple time-bin modes.
- Utilized time-bin resolved (local) and time-bucket (global) coincidence detection.
Main Results:
- Observed distinct two-photon interference phenomena based on detection method.
- Local measurements showed standard Hong-Ou-Mandel dips.
- Global two-photon visibility was governed by the overlap of delocalized single-photon states.
Conclusions:
- Successfully introduced a method for engineering distributed quantum interferences.
- Demonstrated coherent control over photon mode structure for interference synthesis.
- Highlighted the difference between local and global interference in quantum networks.
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