Qubit Zoo

Qubit Zoo Index MOC

5 min read

Top-level navigation for the Qubit Zoo through non-exclusive facets. An entry may appear in more than one map, so facet memberships can sum to more than the unique-entry count. These counts describe editorial organization, not platform importance or maturity.

Family MOCs

Editorial policy

How to use this map

  • Start with a family MOC when you want modality-local comparisons.
  • Jump to Evergreen notes when you want mechanism-level synthesis that cuts across families.
  • Treat Reference notes as evidence nodes, not the main conceptual layer.

High-value cross-family slice: defect-spin networking

High-value cross-family slice: stationary-to-flying interfaces

  • Start in superconducting-moc or semiconducting-moc while the information is still stored and controlled in a microwave-native stationary qubit. Local resonators and exchange links can move excitations around a processor, but they do not by themselves produce a low-loss fibre channel.
  • Move through cross-platform-moc and quantum-transduction when the architecture must convert microwave quantum information into optical photons. Judge this route by end-to-end efficiency, added noise, bandwidth, and refrigerator heat load together; optimizing any one metric in isolation can hide the real systems cost.
  • Take the native-emitter alternative through spin-photon-moc when the stationary qubit already has a useful optical transition. This can remove a frequency-conversion stage, but it moves the burden to photon collection, indistinguishability, spectral stability, and the emitter’s cryogenic envelope.
  • End in photonic-moc once the question becomes which flying encoding or optical computation model carries the information onward. Use divincenzo-criteria to compare the two interface strategies without confusing a good local qubit with a complete networking stack.

High-value cross-family slice: semiconductor-superconductor boundary

High-value cross-family slice: two-qubit interaction carriers

  • Start in semiconducting-moc when neighboring spins entangle through electrically pulsed exchange. Read exchange-interaction-in-quantum-dots for how gate voltages manufacture , then heisenberg-exchange-in-quantum-dots for the logical unitary after the charge sector has been projected out. The scaling debt is local wiring, charge sensitivity, and routing beyond a nearest-neighbor exchange graph.
  • Move to superconducting-moc when a microwave resonator or tunable coupler mediates the interaction. resonator-as-quantum-bus explains the shared-mode route; the architectural comparison should track parasitic , idle isolation, frequency crowding, and coupler calibration rather than treating every connected edge as equivalent.
  • Use trapped-ion-moc when the carrier is a collective phonon mode. motional-mode-coupling-in-ion-traps explains why ions can interact across a chain and why that advantage eventually creates mode-crowding, heating, and closure constraints that motivate shuttling into smaller interaction zones.
  • Use neutral-atom-moc when the interaction is borrowed transiently from Rydberg excitation rather than stored in a persistent bus. rydberg-blockade-mechanism ties gate range to blockade strength and geometry, while tweezer rearrangement changes which pairs are brought into that interaction neighborhood.
  • Compare these branches by asking three questions in order: what carries the interaction, how completely can it be turned off or disentangled at gate end, and what resource must be routed or recalibrated as the processor grows? Raw two-qubit fidelity alone hides the architectural cost that distinguishes direct exchange, virtual photons, collective motion, and blockade.

High-value cross-family slice: storage manifold versus interaction manifold

  • Start in neutral-atom-moc for the cleanest deliberate separation: information idles in hyperfine, clock, or nuclear-spin states, then temporarily borrows a Rydberg manifold for entanglement. coherence-time-hierarchy explains the storage advantage; rydberg-blockade-mechanism explains the decay, leakage, and laser-control debt introduced during gates.
  • Move to semiconducting-moc when encoded spin information is protected from uniform magnetic noise but electrical exchange control still borrows charge admixture. Read decoherence-free-subspace for what the encoding removes and charge-noise-sweet-spot for the residual cost of making that protected information electrically steerable.
  • Use trapped-ion-moc when internal electronic or hyperfine states store the qubit while collective motion is populated only as a gate bus. motional-mode-coupling-in-ion-traps makes the key success condition explicit: the phonon trajectory must close so the logical state disentangles from motion at gate end.
  • Use superconducting-moc when the separation is engineered through dressed modes rather than distinct atomic manifolds. A data qubit can stay detuned while virtual cavity photons or a tunable coupler activate an interaction, but purcell-protection-via-detuning and resonator-as-quantum-bus show that the borrowed mode still leaves lifetime and residual-coupling costs.
  • Compare these branches by asking: where does information wait, what auxiliary degree of freedom is occupied or admixed during a gate, and what evidence shows that degree of freedom is empty or disentangled afterward? This catches leakage and bus-reset failure modes that a two-qubit fidelity number can conceal.

High-value cross-family slice: hardware-assisted fault tolerance

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