Coherent light scattering from a telecom C-band quantum dot

Quantum networks have the potential to transform secure communication via quantum key distribution and enable novel concepts in distributed quantum computing and sensing. Coherent quantum light generation at telecom wavelengths is fundamental for fibre-based network implementations, but Fourier-limi...

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Bibliographic Details
Published in:Nature communications 2023-12, Vol.14 (1), p.8371-11, Article 8371
Main Authors: Wells, L., Müller, T., Stevenson, R. M., Skiba-Szymanska, J., Ritchie, D. A., Shields, A. J.
Format: Article
Language:English
Subjects:
639/624/399/1017
639/766/483/3925
C band
Coherent light
Coherent scattering
Elastic limit
Elastic scattering
Emissions
Excitation
Humanities and Social Sciences
Indium arsenides
Indium phosphides
Interference
Light scattering
multidisciplinary
Photons
Quantum computing
Quantum cryptography
Quantum dots
Science
Science (multidisciplinary)
Telecommunications
Wavelength
Wavelengths
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Summary:Quantum networks have the potential to transform secure communication via quantum key distribution and enable novel concepts in distributed quantum computing and sensing. Coherent quantum light generation at telecom wavelengths is fundamental for fibre-based network implementations, but Fourier-limited emission and subnatural linewidth photons have so far only been reported from systems operating in the visible to near-infrared wavelength range. Here, we use InAs/InP quantum dots to demonstrate photons with coherence times much longer than the Fourier limit at telecom wavelength via elastic scattering of excitation laser photons. Further, we show that even the inelastically scattered photons have coherence times within the error bars of the Fourier limit. Finally, we make direct use of the minimal attenuation in fibre for these photons by measuring two-photon interference after 25 km of fibre, demonstrating finite interference visibility for photons emitted about 100,000 excitation cycles apart. Developing quantum networks would require reliable sources of coherent quantum light at telecom wavelengths. Here, the authors employ elastic scattering of excitation laser photons on InAs/InP quantum dots to demonstrate the emission of telecom photons with coherence times longer than the Fourier limit.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-023-43757-3