• The collaboration of TU Wien with research groups in China has resulted in a crucial building block for a new kind of quantum computer: The realization of a novel type of quantum logic gate makes it possible to carry out quantum computations on pairs of photons that are each in four different quantum states, or combinations thereof. • The advancement is an important milestone for optical quantum computers. • The study has now been published in Nature Photonics.
Article Summaries:
- Researchers from TU Wien and Chinese collaborators have demonstrated a new quantum‑logic gate that operates on photons encoded in four distinct quantum states (a ququart). The gate enables two‑photon operations in high‑dimensional Hilbert spaces, allowing quantum computations on superpositions of four basis states rather than the usual binary qubits. This development marks a significant milestone for optical quantum computing, expanding the computational power of photonic systems. The results were reported in Nature Photonics.
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