Integrated quantum photonics is a promising platform for developing quantum technologies, including quantum computers, due to its capacity to generate and control individual photons in its optical circuits. However, an important challenge that has limited the scaling of integrated quantum photonics has been the lack of on-chip sources able to generate high-quality single photons, according to Stefano Paesani, one of a team of physicists at the University of Bristol (England) working on quantum photon sources. "Without low-noise photon sources, errors in a quantum computation accumulate rapidly when increasing the circuit complexity, resulting in the computation being no longer reliable," says Paesani. "Moreover, optical losses in the sources limit the number of photons the quantum computer can produce and process."
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