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Updated: Aug 2, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Mode-locked two-photon states
1Department of Physics, Indiana University-Purdue University Indianapolis, 402 North Blackford Street, Indianapolis, Indiana 46202, USA.
Mode locking in lasers is applied to create frequency-entangled two-photon states. These states show a comb-like correlation function, confirmed by Hong-Ou-Mandel interference experiments.
Area of Science:
- Quantum optics
- Laser physics
- Quantum information science
Background:
- Mode locking is a technique used to generate ultrashort pulses in lasers.
- Frequency entanglement is a key property for quantum information processing.
- Parametric down conversion is a nonlinear optical process used to generate entangled photon pairs.
Purpose of the Study:
- To apply the concept of laser mode locking to generate frequency-entangled two-photon states.
- To investigate the correlation properties of these mode-locked two-photon states.
- To demonstrate a method for engineering quantum states in the time domain.
Main Methods:
- Cavity-enhanced spontaneous parametric down conversion (CESPDC) was used to produce the two-photon state.
- A Hong-Ou-Mandel interferometer was employed to measure the correlation function of the generated state.
- The experiment utilized an unbalanced interferometer setup.
Main Results:
- CESPDC successfully generated a mode-locked two-photon state with frequency entanglement.
- The mode-locked two-photon state exhibited a comblike correlation function.
- A revival of the typical interference dip was observed in the Hong-Ou-Mandel experiment, confirming the state's properties.
Conclusions:
- The study demonstrates the successful generation and characterization of mode-locked two-photon states with frequency entanglement.
- The results highlight the potential of CESPDC for creating tailored quantum states.
- A scheme for engineering quantum states in the time domain was discussed, paving the way for advanced quantum technologies.
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