Spin-Photon MOC

Curated map of Zoo entries in the Spin-Photon family.

Entries

Entry	Type	Status
siv-color-center-qubit	qubit	demonstrated
t-center-qubit	qubit	demonstrated

Composition

• qubit: 2

Conceptual anchors

• divincenzo-criteria criteria 6 and 7 organize this family more cleanly than gate-centric comparisons, because every note here is really about turning a local spin memory into a networkable module.
• coherence-time-hierarchy captures the main engineering cost of those cleaner optical interfaces: spectral quality, cryogenic burden, and memory lifetime move together rather than independently.
• quantum-transduction is a useful boundary note: platforms here are most interesting when they reduce or avoid transduction pain by emitting photons that are already spectrally useful for networking.

Curated synthesis

This family is best read as the network-emitter-optimized descendant branch of the broader defect-spin story.

1. siv-color-center-qubit is the optical-quality-first branch

   • Group-IV vacancy centers buy much cleaner photons than NV by using inversion symmetry to suppress electric-field sensitivity.
   • The price is cryogenic severity: SiV offers excellent optical coherence but drags in a harsher phonon-temperature constraint, while SnV eases that constraint at the cost of a less mature platform.

2. t-center-qubit is the telecom-and-integration-first branch

   • The central claim is not just “another defect spin,” but “a spin-photon node already living in silicon and already emitting in the telecom O-band.”
   • Route here when silicon-photonics compatibility, fibre-network realism, or modular distributed-computing fit matters more than diamond-emitter maturity.

3. The family-level comparison is about which systems burden you want to pay

   • SiV/SnV pay heavily in temperature to buy cleaner optical lines and nanophotonic performance.
   • T centers pay in platform maturity and benchmark depth, but may save substantial systems complexity by starting inside silicon and near telecom wavelengths.

Routing rule

• Read this MOC when the primary question is how to build a better spin-to-photon interface, not how to get the most mature defect-spin qubit overall.
• Hand back to color-center-moc when room-temperature operation, ODMR-style control, or local defect-spin memory maturity becomes the main criterion.
• Use quantum-transduction as the downstream systems check: if a platform already emits where the network wants to live, that is a real architectural advantage, not just a spectroscopy detail.