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

• URL: http://arxiv.org/abs/2310.16930v1
• Date: Wed, 25 Oct 2023 18:53:42 GMT
• Title: Spin-photon entanglement with direct photon emission in the telecom C-band
• Authors: P. Laccotripes, T. M\"uller, R.M. Stevenson, J. Skiba-Szymanska, D.A. Ritchie, A.J. Shields
• Abstract summary: Solid-state quantum emitters in the telecom C-band are a promising platform for quantum communication applications. We report the first demonstration of spin-photon entanglement in a solid-state system capable of direct emission into the telecom C-band.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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