Quantum-dot based telecom-wavelength quantum relay

Abstract

The development of quantum relays for long haul and attack-proof quantum communication networks operating with weak coherent laser pulses requires entangled photon sources at telecommunication wavelengths with intrinsic single-photon emission for most practical implementations. Using a semiconductor quantum dot emitting entangled photon pairs in the telecom O-band, we demonstrate for the first time a quantum relay fulfilling both of these conditions. The system achieves a maximum fidelity of 94.5 % for implementation of a standard 4-state protocol with input states generated by a laser. We further investigate robustness against frequency detuning of the narrow-band input and perform process tomography of the teleporter, revealing operation for arbitrary pure input states, with an average gate fidelity of 83.6 %. The results highlight the potential of semiconductor light sources for compact and robust quantum relay technology, compatible with existing communication infrastructures.

14 pages, 5 figures

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• Semiconductor quantum dots as an ideal source of polarization entangled photon pairs on-demand: a review
• Quantum teleportation using highly coherent emission from telecom C-band quantum dots
• The crux of using the cascaded emission of a 3-level quantum ladder system to generate indistinguishable photons
• Coherence and indistinguishability of highly pure single photons from non-resonantly and resonantly excited telecom C-band quantum dots
• Quantum Teleportation with Imperfect Quantum Dots
• A source of entangled photons based on a cavity-enhanced and strain-tuned GaAs quantum dot
• GHz-clocked teleportation of time-bin qubits with a telecom C-band quantum dot
• Long-term transmission of entangled photons from single quantum dot over deployed fiber
• Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution
• Fine structure splitting analysis of cavity-enhanced telecom-wavelength InAs quantum dots grown on a GaAs(111)A vicinal substrate
• Interferometry of multi-level systems: rate-equation approach for a charge qudit
• Entanglement robustness to excitonic spin precession in a quantum dot
• Buried Stressor Engineering for Position-Controlled InGaAs Quantum Dots with Local Density Variation for Integrated Quantum Photonics
• Spin properties in droplet epitaxy-grown telecom quantum dots