Efficient Bell state analyzer for time-bin qubits with fast-recovery WSi superconducting single photon detectors
Raju Valivarthi, I. Lucio-Martinez, Allison Rubenok, Philip K. Chan, Francesco Marsili, Varun Boehm Verma, Matthew D. Shaw, Jill A. Stern, Joshua A. Slater, Daniel Oblak, Sung‐Wook Nam, Wolfgang Tittel · Optics Express · 2014
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, |ψ⁻〉 and |ψ⁺〉. Compared to previous implementations for time-bin qubits, this yields an increase in the efficiency of Bell state analysis by a factor of thirty.