Superconducting quantum computers are often shown as chips inside deep refrigerators, but scale will depend on the cold signal network around the chip. Control, readout, timing, calibration, and diagnostics must pass through a tight refrigerator without adding excess heat, loss, noise, or clutter. Cryogenic photonics can help by using light, fiber, cryogenic conversion devices, engineered electromagnetic structures, and cold-compatible devices to move information with less thermal and wiring burden.