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Observation of Edge Magnetoplasmon Squeezing in a Quantum Hall Conductor
H Bartolomei1, R Bisognin1, H Kamata1
1Laboratoire de Physique de l'Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris Cité, F-75005 Paris, France.
Physical Review Letters
|March 24, 2023
Summary
Researchers demonstrate quantum squeezing in high-impedance systems, achieving 18% noise reduction below vacuum fluctuations. This opens new avenues for coupling quantum conductors and enhancing quantum technologies.
Area of Science:
- Quantum optics
- Condensed matter physics
- Quantum information science
Background:
- Squeezing of electromagnetic field quadratures is well-established in optics and microwaves.
- Previous research focused on low impedance environments (Z0 ≈ 50 Ω).
Purpose of the Study:
- To demonstrate squeezing of bosonic edge magnetoplasmon modes in a high-impedance quantum Hall conductor.
- To explore enhanced coupling possibilities to low-dimensional quantum conductors.
Main Methods:
- Utilizing a quantum Hall conductor with impedance set by the quantum of resistance (RK ≈ 25 kΩ).
- Applying combined DC and AC drives to a quantum point contact.
Main Results:
- Successful demonstration of squeezing in bosonic edge magnetoplasmon modes.
- Observed noise reduction of 18% below vacuum fluctuations.
Conclusions:
- This work extends quantum squeezing to high-impedance systems, a significant advancement from previous low-impedance studies.
- Further improvements in squeezing are possible with more complex conductors like driven quantum dots or mesoscopic capacitors, paving the way for advanced quantum devices.
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