Controlling the Photon Number Coherence of Solid-state Quantum Light Sources for Quantum Cryptography
arXiv:2305.20017 · doi:10.1038/s41534-024-00811-2
Abstract
Quantum communication networks rely on quantum cryptographic protocols including quantum key distribution (QKD) using single photons. A critical element regarding the security of QKD protocols is the photon number coherence (PNC), i.e. the phase relation between the zero and one-photon Fock state, which critically depends on the excitation scheme. Thus, to obtain flying qubits with the desired properties, optimal pumping schemes for quantum emitters need to be selected. Semiconductor quantum dots generate on-demand single photons with high purity and indistinguishability. Exploiting two-photon excitation of a quantum dot combined with a stimulation pulse, we demonstrate the generation of high-quality single photons with a controllable degree of PNC. Our approach provides a viable route toward secure communication in quantum networks.
17 pages
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Cited by in corpus (8)
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- Quantum interferences and gates with emitter-based coherent photon sources
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- Towards Photon-Number-Encoded High-dimensional Entanglement from a Sequentially Excited Quantum Three-Level System
- Photon Number Coherence in Quantum Dot-Cavity Systems can be Enhanced by Phonons
- Decoy-state quantum key distribution over 227 km with a frequency-converted telecom single-photon source