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==Qubit readout==
Architecture-specific readout, or [[Quantum measurement|measurement]], mechanisms exist. Readout of a phase qubit is explained in the [[#Qubit archetypes|qubit archetypes table]] above. A flux qubit state is often read using an adjustable DC-[[SQUID]] [[magnetometer]]. States may also be measured using an [[electrometer]].<ref name="docs.pennylane.ai">{{Cite web |title=PennyLane Documentation — PennyLane |url=https://docs.pennylane.ai/en/stable/index.html |access-date=2022-12-11 |website=docs.pennylane.ai |language=en}}</ref> A more general readout scheme includes a coupling to a microwave [[resonator]], where resonance frequency of the resonator is dispersively shifted by the qubit state.<ref name=NatRev2017>{{cite journal |last1=Gambetta |first1=Jay M. |last2=Chow |first2=Jerry M. |last3=Steffen |first3=Matthias |title=Building logical qubits in a superconducting quantum computing system |journal=[[npj Quantum Information]] |date=13 January 2017 |volume=3 |issue=1 |pages=2 |doi=10.1038/s41534-016-0004-0 |doi-access=free |bibcode=2017npjQI...3....2G |arxiv=1510.04375 }}
</ref><ref name="Dispersive Readout">{{cite journal |last1=Blais |first1=Alexandre |last2=Huang |first2=Ren-Shou |last3=Wallraff |first3=Andreas |last4=Girvin |first4=Steven |last5=Schoelkopf |first5=Robert |title=Cavity quantum electrodynamics for superconducting electrical circuits: An architecture for quantum computation |journal=Phys. Rev. A |date=2004 |volume=69 |issue=6 |pages=062320 |doi=10.1103/PhysRevA.69.062320 |url=https://link.aps.org/doi/10.1103/PhysRevA.69.062320|arxiv=cond-mat/0402216 |bibcode=2004PhRvA..69f2320B |s2cid=20427333 }}</ref>. Multi-level systems (qudits) can be readout using electron shelving <ref name="Cottet Xiong Nguyen Lin 2021 p. ">{{cite journal | last=Cottet | first=Nathanaël | last2=Xiong | first2=Haonan | last3=Nguyen | first3=Long B. | last4=Lin | first4=Yen-Hsiang | last5=Manucharyan | first5=Vladimir E. | title=Electron shelving of a superconducting artificial atom | journal=Nature Communications | publisher=Springer Science and Business Media LLC | volume=12 | issue=1 | date=2021-11-04 | issn=2041-1723 | doi=10.1038/s41467-021-26686-x | page=}}</ref>.
==DiVincenzo's criteria==
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