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Antibunched Photons Emitted by a dc-Biased Josephson Junction.
C Rolland1, A Peugeot1, S Dambach2
1DSM/IRAMIS/SPEC, CNRS UMR 3680, CEA, Université Paris-Saclay, 91190 Gif sur Yvette, France.
Physical Review Letters
|May 31, 2019
Summary
We demonstrate a simple circuit that emits antibunched microwave photons. This novel single-photon source operates at high rates, showing promise for quantum technologies.
Area of Science:
- Quantum optics
- Solid-state physics
- Microwave engineering
Background:
- Single-photon sources are crucial for quantum information processing.
- Generating single photons in the microwave domain presents unique challenges.
- Josephson junctions coupled to resonators are promising candidates for photon generation.
Purpose of the Study:
- To experimentally demonstrate antibunched photon emission from a DC-biased Josephson junction in series with a microwave resonator.
- To characterize the photon emission rate and antibunching properties.
- To validate the experimental results against theoretical predictions.
Main Methods:
- Fabrication of a microfabricated spiral coil resonator with a characteristic impedance of 1.97 kΩ, resonating at 4.4 GHz.
- Integration of a DC-biased Josephson junction in series with the microwave resonator.
- Measurement of the second-order correlation function of the emitted microwave power.
Main Results:
- Observation of antibunched photons with a second-order correlation function value of 0.3 at zero delay.
- Demonstration of single-photon emission at a rate of 6×10^7 photons per second.
- Experimental results show quantitative agreement with theoretical predictions.
Conclusions:
- A simple and efficient scheme for generating antibunched microwave photons has been experimentally realized.
- The demonstrated circuit serves as a bright single-photon source in the microwave domain.
- This work paves the way for practical applications in quantum microwave technologies.
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