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Updated: Jan 24, 2026
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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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On-demand photonic entanglement synthesizer
Shuntaro Takeda1,2,3, Kan Takase1, Akira Furusawa1,2
1Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Science Advances
|May 23, 2019
Summary
Researchers developed a versatile quantum entanglement synthesizer. This device uses a single light source to generate various entangled states on demand, including large cluster states, and functions as a quantum memory.
Area of Science:
- Quantum optics
- Quantum information science
- Quantum computing hardware
Background:
- Quantum information protocols rely on diverse entangled states like Einstein-Podolsky-Rosen, Greenberger-Horne-Zeilinger, and cluster states.
- Current methods for on-demand preparation using squeezed light sources lack versatility, requiring distinct optical circuits for each state type.
Purpose of the Study:
- To demonstrate a single, programmable on-demand entanglement synthesizer capable of generating multiple types of quantum entanglement.
- To overcome the limitations of non-versatile optical circuits in current quantum state preparation.
Main Methods:
- Development of a novel loop-based optical circuit with dynamic control at nanosecond timescales.
- Time-domain processing of optical pulses to generate various entangled states from a single squeezed light source.
- Integration of quantum memory functionality for storage and release of entangled states.
Main Results:
- Successful on-demand generation of five different small-scale entangled states (e.g., EPR, GHZ) using the synthesizer.
- Creation of a large-scale cluster state comprising over 1000 modes without altering the optical circuit.
- Demonstration of the circuit's capability to function as a quantum memory.
Conclusions:
- The developed entanglement synthesizer offers unprecedented versatility for generating diverse quantum states from a single setup.
- This technology paves the way for more general entanglement synthesizers and scalable quantum processors.
- The integrated quantum memory function enhances the utility for advanced quantum information processing.
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