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Coherently and Incoherently Pumped Telecom C-Band Single-Photon Source with High Brightness and Indistinguishability
Raphael Joos1, Stephanie Bauer1, Christian Rupp1
1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany.
Nano Letters
|July 8, 2024
Summary
This study introduces a novel single-photon source for quantum networks, achieving high efficiency and low multiphoton contributions using two distinct excitation schemes for coherent and incoherent operation.
Area of Science:
- Quantum optics and photonics
- Solid-state quantum emitters
- Quantum communication technologies
Background:
- Long-range quantum networks demand high-brightness single-photon sources in the telecom C-band.
- Excitation schemes (coherent vs. incoherent) significantly influence photon properties crucial for quantum applications.
- Photon indistinguishability, purity, and number coherence are key for quantum cryptography and communication.
Purpose of the Study:
- To develop a versatile single-photon source operating in the telecom C-band.
- To investigate the impact of coherent and incoherent pumping schemes on photon properties.
- To achieve high efficiency and low multiphoton contributions for quantum network applications.
Main Methods:
- Utilized a quantum dot coupled to a circular Bragg grating cavity.
- Implemented the SUPER scheme for coherent excitation.
- Employed phonon-assisted excitation for incoherent operation.
Main Results:
- Achieved high end-to-end efficiencies of 5.36% (coherent) and 6.09% (incoherent).
- Demonstrated low multiphoton contributions: g(2)(0) = 0.076 ± 0.001 (coherent) and g(2)(0) = 0.069 ± 0.001 (incoherent).
- Successfully operated the source using two complementary pumping schemes.
Conclusions:
- The developed source is suitable for long-range terrestrial quantum networks.
- The dual-mode operation (coherent/incoherent) offers flexibility for different quantum communication protocols.
- This work advances the development of efficient and high-purity single-photon sources for quantum technologies.
