Figure 2
Setup for device characterization with quantum light in the telecom band. (a) Schematic of the two-photon source adopted in the experiment: pairs of photons are emitted in two different spatial modes and injected into single-mode fibers. L, lens (50 cm focal length); P, pinhole; BiBO, bismuth borate crystal; BPF, band pass filter; LPF, long pass filter; PBS, polarizing beam splitter; WPs, wave plates for polarization compensation. (b) The generated photons are injected in spatial delay lines for temporal synchronization and propagate through a set of waveplates for polarization compensation. (c) Single-mode fiber arrays (SMFA) are used to inject the photons in both of the interferometer's inputs and to collect photons from both output modes. (d) Schematic of the integrated tunable Mach-Zehnder interferometer. The phase ϕ in the interferometer is controlled by tuning the driving voltage on the resistive heating plate placed on the chip surface.
