Spin-photon entanglement with direct photon emission in the telecom C-band

Abstract

The ever-evolving demands for computational power and for a securely connected world dictate the development of quantum networks where entanglement is distributed between connected parties. Solid-state quantum emitters in the telecom C-band are a promising platform for quantum communication applications due to the minimal absorption of photons at these wavelengths, "on-demand" generation of single photon flying qubits, and ease of integration with existing network infrastructure. Here, we use an InAs/InP quantum dot to implement an optically active spin-qubit, based on a negatively charged exciton where the electron spin degeneracy is lifted using a Voigt magnetic field. We investigate the coherent interactions of the spin-qubit system under resonant excitation, demonstrating high fidelity spin initialisation and coherent control using picosecond pulses. We further use these tools to measure the coherence of a single, undisturbed electron spin in our system. Finally, we report the first demonstration of spin-photon entanglement in a solid-state system capable of direct emission into the telecom C-band.

19 pages (including references), 5 figures

References in corpus (11)

• Deterministic Generation of a Cluster State of Entangled Photons
• A photonic cluster state machine gun
• Visible-to-telecom quantum frequency conversion of light from a single quantum emitter
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Cited by in corpus (8)

• Electrically-triggered spin-photon devices in silicon
• Purcell enhanced and tunable single-photon emission at telecom wavelengths from InAs quantum dots in circular photonic crystal resonators
• Initialization of Neutral and Charged Exciton Spin States in a Telecom-Emitting Quantum Dot
• Stark Tuning and Charge State Control in Individual Telecom C-Band Quantum Dots
• Kilometer-Scale Ion-Photon Entanglement with a Metastable ${}^{88}$Sr${}^{+}$ Qubit
• Spin properties in droplet epitaxy-grown telecom quantum dots
• Spin-photon Qubits for Scalable Quantum Network
• Routing single photons with quantum emitters coupled to nanostructures