Figure 1From: A low-noise single-photon detector for long-distance free-space quantum communicationPhoto of the detector package. On the left is the vacuumed detector package with an optical window (covered with a black cap), and on the right is the electronics board with its metal shield removed. However the detector cannot be used without proper shielding of its PCB because of interference with outer sources, e.g., mobile phonesBack to article page