Hardware Architectures: Superconducting, Ion Traps, Photonics, etc.
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As we move towards the 1000-qubit regime, the interconnect architecture becomes the primary constraint. Superconducting (Transmon) Platforms: - **Pros**: High gate speeds (ns), established lithography. - **Cons**: 2D connectivity limits (nearest-neighbor), massive cryogenic overhead for coaxial wiring. Trapped-Ion (QCCD) Platforms: - **Pros**: All-to-all connectivity within a zone, long coherence times ($T_2$). - **Cons**: Slow gate speeds ($\mu s$), complexity of laser/optical switching at scale. Is the **Photonic Interconnect** (transducing microwave photons to optical) the only viable path for modular superconducting scaling? Or should we focus on 3D integration with TSVs (Through-Silicon Vias)?