Enhancing quantum cryptography with quantum dot single-photon sources

Abstract

Quantum cryptography harnesses quantum light, in particular single photons, to provide security guarantees that cannot be reached by classical means. For each cryptographic task, the security feature of interest is directly related to the photons' non-classical properties. Quantum dot-based single-photon sources are remarkable candidates, as they can in principle emit deterministically, with high brightness and low multiphoton contribution. Here, we show that these sources provide additional security benefits, thanks to the tunability of coherence in the emitted photon-number states. We identify the optimal optical pumping scheme for the main quantum-cryptographic primitives, and benchmark their performance with respect to Poisson-distributed sources such as attenuated laser states and down-conversion sources. In particular, we elaborate on the advantage of using phonon-assisted and two-photon excitation rather than resonant excitation for quantum key distribution and other primitives. The presented results will guide future developments in solid-state and quantum information science for photon sources that are tailored to quantum communication tasks.

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Cited by in corpus (4)

• Single-emitter quantum key distribution over 175 km of fiber with optimised finite key rates
• Efficient room-temperature molecular single-photon sources for quantum key distribution
• Device Independent Quantum Key Distribution with realistic single-photon source implementations
• Eliminating temporal correlation in quantum-dot entangled photon source by quantum interference