A cavity coupling a charged nanodot and a fiber can act as a quantum interface, through which a stationary spin qubit and a flying photon qubit can be inter-converted via cavity-assisted Raman process. This Raman process can be controlled to generate or annihilate an arbitrarily shaped single-photon wavepacket by pulse-shaping the controlling laser field. This quantum interface forms the basis for many essential functions of a quantum network, including sending, receiving, transferring, swapping, and entangling qubits at distributed quantum nodes as well as a deterministic source and an efficient detector of a single photon wavepacket with arbitrarily specified shape and average photon number. Numerical study of noise effects on the operations shows high fidelity.
@article{arxiv.quant-ph/0407060,
title = {Theory of control of spin/photon interface for quantum networks},
author = {Wang Yao and Ren-Bao Liu and L. J. Sham},
journal= {arXiv preprint arXiv:quant-ph/0407060},
year = {2009}
}