Figure 2
From: Faithful conditional quantum state transfer between weakly coupled qubits
Schematic of the experimental setup.
Polarization states of photons are controlled with the help of half-wave plates (HWP) and a quarter-wave plate (QWP). The photons interfere on a partially polarizing bulk beam splitter PPBS and the polarization state of source photon is measured using a HWP1, polarizing beam splitter PBS1 and two single photon detectors D3 and D4. A tunable polarization filter G is constructed from two calcite beam displacers BD and wave plates. After filtration, the target photon is coupled into fiber-based Mach-Zehnder interferometer formed by two polarization maintaining fibers and a balanced fiber coupler FBS. Real-time feed-forward is implemented by driving one of the integrated phase modulators (PM1) by an electronic signal from detector D3.
