Controlling the photon number coherence of solid-state quantum light sources for quantum cryptography

Controlling the photon number coherence of solid-state quantum light sources for quantum cryptography

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Abstract Quantum communication networks rely on quantum cryptographic protocols including quantum key distribution (QKD) based on single photons.A critical element regarding the security of QKD protocols is the photon number coherence (copyright), i.e., the phase relation between the vacuum and one-photon Fock state.To obtain single photons with the desired underwater treasures sunken medallion properties for QKD protocols, optimal excitation schemes for quantum emitters need to be selected.

As emitters, we consider semiconductor quantum dots, that are known to generate on-demand single photons click here 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 copyright.The main tuning knob is the pulse area giving full control from minimal to maximal copyright, while without the stimulating pulse the copyright is negligible in our setup for all pulse areas.Our approach provides a viable route toward secure communication in quantum networks.