On-Demand Generation of Indistinguishable Photons in the Telecom C-Band using Quantum Dot Devices

Abstract

Semiconductor quantum dots (QDs) enable the generation of single and entangled photons, useful for various applications in photonic quantum technologies. Specifically for quantum communication via fiber-optical networks, operation in the telecom C-band centered around 1550nm is ideal. The direct generation of QD-photons in this spectral range and with high quantum-optical quality, however, remained challenging. Here, we demonstrate the coherent on-demand generation of indistinguishable photons in the telecom C-band from single QD devices consisting of InAs/InP QD-mesa structures heterogeneously integrated with a metallic reflector on a silicon wafer. Using pulsed two-photon resonant excitation of the biexciton-exciton radiative cascade, we observe Rabi rotations up to pulse areas of $4\pi$ and a high single-photon purity in terms of $g^{(2)}(0)=0.005(1)$ and $0.015(1)$ for exciton and biexciton photons, respectively. Applying two independent experimental methods, based on fitting Rabi rotations in the emission intensity and performing photon cross-correlation measurements, we consistently obtain preparation fidelities at the $\pi$-pulse exceeding 80$\%$. Finally, performing Hong-Ou-Mandel-type two-photon interference experiments we obtain a photon-indistinguishability of the full photon wave packet of up to $35(3)\%$, representing a significant advancement in the photon-indistinguishability of single photons emitted directly in the telecom C-band.

Main text: 24 pages (including 4 figures, 1 table, and 56 citations); Supporting Information: 18 pages (including 10 figures and 3 tables);

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• Circular photonic crystal grating design for charge-tunable quantum light sources in the telecom C-band
• Efficient, indistinguishable telecom C-band photons using a tapered nanobeam
• Two-Photon Interference from an InAs Quantum Dot emitting in the Telecom C-Band
• Purcell enhanced and tunable single-photon emission at telecom wavelengths from InAs quantum dots in circular photonic crystal resonators
• On-demand generation of entangled photons pairs in the telecom O-band from nanowire quantum dots
• SUPER and femtosecond spin-conserving coherent excitation of a tin-vacancy color center in diamond
• Towards Photon-Number-Encoded High-dimensional Entanglement from a Sequentially Excited Quantum Three-Level System
• Stark Tuning and Charge State Control in Individual Telecom C-Band Quantum Dots
• A Concise Primer on Solid-State Quantum Emitters
• Indistinguishable Single Photons from Nanowire Quantum Dots in the Telecom O-Band
• Electrical-control of third-order nonlinearity via Fano interference
• Entanglement-verified time distribution in a metropolitan network
• Photon Number Coherence in Quantum Dot-Cavity Systems can be Enhanced by Phonons
• Spin-photon Qubits for Scalable Quantum Network
• Quantum interference between autonomous dissimilar quantum light sources for hybrid quantum networks