We experimentally demonstrate a high-efficiency Bell state measurement for time-bin qubits that employs two superconducting nanowire single-photon detectors with short dead-times, allowing projections onto two Bell states, |Psi>- and |Psi+>. Compared to previous implementations for time-bin qubits, this yields an increase in the efficiency of Bell state analysis by a factor of thirty.
@article{arxiv.1410.4861,
title = {Efficient Bell state analyzer for time-bin qubits with fast-recovery WSi superconducting single photon detectors},
author = {Raju Valivarthi and Itzel Lucio-Martinez and Allison Rubenok and Philip Chan and Francesco Marsili and Varun B. Verma and Matthew D. Shaw and J. A. Stern and Joshua A. Slater and Daniel Oblak and Sae Woo Nam and Wolfgang Tittel},
journal= {arXiv preprint arXiv:1410.4861},
year = {2014}
}