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

P. Laccotripes (), T. Müller (), R. M. Stevenson, J. Skiba-Szymanska, D. A. Ritchie and A. J. Shields
Additional contact information
P. Laccotripes: Toshiba Europe Limited
T. Müller: Toshiba Europe Limited
R. M. Stevenson: Toshiba Europe Limited
J. Skiba-Szymanska: Toshiba Europe Limited
D. A. Ritchie: University of Cambridge
A. J. Shields: Toshiba Europe Limited

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Quantum networks, relying on the distribution of quantum entanglement between remote locations, have the potential to transform quantum computation and secure long-distance quantum communication. However, a fundamental ingredient for fibre-based implementations of such networks, namely entanglement between a single spin and a photon directly emitted at telecom wavelengths, has been unattainable so far. Here, we use a negatively charged exciton in an InAs/InP quantum dot to implement an optically active spin qubit taking advantage of the lowest-loss transmission window, the telecom C-band. 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 demonstrate spin-photon entanglement in a solid-state system with entanglement fidelity F = 80.07 ± 2.9%, more than 10 standard deviations above the classical limit.

Date: 2024
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DOI: 10.1038/s41467-024-53964-1

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