Heralded amplification of photonic qubits
Natalia Bruno, Vittorio Pini, Anthony Martin, Varun B. Verma, Sae Woo Nam, Richard P. Mirin, Adriana E. Lita, Francesco Marsili, Boris A. Korzh, Félix Bussières, Nicolas Sangouard, Hugo Zbinden, Nicolas Gisin, Rob Thew · Optics Express · 2016
We demonstrate postselection free heralded qubit amplification for Time-Bin qubits and single photon states in an all-fibre, telecom-wavelength, scheme that highlights the simplicity, stability and potential for fully integrated photonic solutions. Exploiting high-efficiency superconducting detectors, the gain, fidelity and the performance of the amplifier are studied as a function of loss. We also demonstrate the first heralded single photon amplifier with independent sources. This provides a significant advance towards demonstrating device-independent quantum key distribution as well as fundamental tests of quantum mechanics over extended distances.