Photonic Quantum Computing

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  Top-view of the 8-mode quantum photonic processor chip based on integrated photonics provided by QuiX Quantum. Copyright: © Lehrstuhl für Lasertechnik LLT, RWTH Aachen University Top-view of the 8-mode quantum photonic processor chip based on integrated photonics provided by QuiX Quantum.

Quantum computing (QC) is a rapidly advancing field with the potential to revolutionize computation and solve problems that are practically intractable using classical computers. Among the various platforms, photonic quantum computing (PQC) stands out as a promising candidate.
Photons interact only weakly with their environment, resulting in long coherence times and thus long qubit lifetimes, which enable many possible computational operations. In contrast to other approaches, photonic quantum computers do not need to be cooled down to cryogenic temperatures, but can be operated at room temperature, which drastically reduces the setup complexity. Moreover, PQC is inherently compatible with optical networks and offers modularity. PQC also benefits from developments in classical photonic integration and the maturity of the photonics industry, all of which are promising a great scalability of integrated on-chip devices.
Furthermore, PQC encompasses a broad spectrum of approaches, ranging from universal methods like measurement-based quantum computing (MBQC) to non-universal techniques such as boson sampling. It is encouraging that quantum advantage was demonstrated with boson sampling, showcasing its potential. (P)QC holds promise for future applications in various fields such as logistical optimization, drug discovery, financial services, and cryptography.