Related Experiment Video
Updated: May 29, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Generation of 10-GHz clock sequential time-bin entanglement
Qiang Zhang1, Carsten Langrock, Hiroki Takesue
1Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. qiangzh@stanford.edu
Researchers generated telecom-band entangled photon pairs at 10 GHz using lithium niobate waveguides. This advancement in quantum communication achieved a high flux and visibility, paving the way for secure networks.
Area of Science:
- Quantum optics
- Photonics
- Quantum information science
Background:
- Entangled photon-pair generation is crucial for quantum communication and quantum information processing.
- Lithium niobate waveguides offer a promising platform for integrated photonic devices due to their nonlinear properties.
Purpose of the Study:
- To demonstrate telecom-band sequential time-bin entangled photon-pair generation.
- To achieve high repetition rates for practical quantum communication applications.
- To investigate the performance of periodically poled reverse-proton-exchange lithium niobate waveguides for entanglement generation.
Main Methods:
- Utilized periodically poled reverse-proton-exchange lithium niobate waveguides.
- Employed mode demultiplexing for entangled photon-pair generation.
- Used up-conversion single-photon detectors for detection.
Main Results:
- Achieved sequential time-bin entangled photon-pair generation at a 10 GHz repetition rate.
- Observed an entangled-photon-pair flux of 313 Hz.
- Measured a two-photon-interference-fringe visibility of 85.32% (without accidental noise subtraction).
Conclusions:
- The study successfully demonstrated high-rate, telecom-band entangled photon-pair generation in lithium niobate waveguides.
- The achieved performance indicates the potential of this platform for building practical quantum communication systems.
- Further research can explore noise reduction techniques to enhance visibility and flux for advanced quantum applications.
Related Concept Videos
Maxam-Gilbert Sequencing
Challenges of the Maxam-Gilbert Method
The...
Generating Electromagnetic Radiations
Carrier Generation and Recombination
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
Time and frequency -Domain Interpretation of Phase-lag Control
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...
Generation Time

