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Updated: Sep 24, 2025
09:23
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
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Observation of Two-Mode Squeezing in a Traveling Wave Parametric Amplifier
Martina Esposito1,2, Arpit Ranadive1, Luca Planat1
1Université Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France.
Physical Review Letters
|May 2, 2022
Summary
Traveling wave parametric amplifiers (TWPAs) demonstrate microwave quantum state generation. This breakthrough enables broadband entanglement for quantum sensing and computing applications.
Area of Science:
- Quantum optics
- Microwave photonics
- Quantum information science
Background:
- Traveling wave parametric amplifiers (TWPAs) are crucial for broadband quantum-limited amplification.
- Experimental demonstration of TWPAs for generating microwave quantum states is lacking.
Purpose of the Study:
- To operate a TWPA as a source of two-mode squeezed microwave radiation.
- To demonstrate broadband entanglement generation using TWPAs.
Main Methods:
- Utilized a TWPA to generate two-mode squeezed microwave radiation.
- Measured logarithmic negativity to quantify entanglement.
- Assessed collective quadrature squeezing below the vacuum limit.
Main Results:
- Achieved broadband entanglement between microwave modes up to 400 MHz.
- Measured logarithmic negativity values between 0.27 and 0.51.
- Demonstrated collective quadrature squeezing between 1.5 and 2.1 dB below the vacuum limit.
Conclusions:
- Successfully operated a TWPA as a source of two-mode squeezed microwave radiation.
- Established broadband entanglement generation, a key step for quantum microwave photonics.
- Opened new avenues for quantum sensing and continuous-variable quantum computing.
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