We demonstrate heralded qubit amplification for Time-Bin and Fock-state qubits in an all-fibre, telecom-wavelength, scheme that highlights the simplicity, the stability and potential for fully integrated photonic solutions. Exploiting high-efficiency superconducting detectors, the gain, the fidelity and the performance of the amplifier are studied as a function of loss. We also demonstrate the first heralded Fock-state qubit amplifier without post-selection. This provides a significant advance towards demonstrating Device-Independent Quantum Key Distribution as well as fundamental tests of quantum mechanics over extended distances.
@article{arxiv.1507.03210,
title = {Heralded amplification of photonic qubits},
author = {Natalia Bruno and Vittorio Pini and Anthony Martin and Boris Korzh and Félix Bussières and Varun Verma and Sae Woo Nam and Richard Mirin and Adriana Lita and Francesco Marsili and Nicolas Sangouard and Hugo Zbinden and Nicolas Gisin and Robert Thew},
journal= {arXiv preprint arXiv:1507.03210},
year = {2016}
}