Superconducting Qubits: A Short Review

SuperconductingQubits:A , y, andJ. yDepartment of AppliedPhysics,YaleUniversity, NewHaven,CT06520 Department of Physics,University of California,Santa Barbara,CA93106 October 11, theJosephsontunneljunction,theonlynon-di ssipative, stronglynon-linearcircuitelement availableat low as spinsor atoms,theytendto be wellcoupledto othercircuits,which make themappeallingfromthepoint of , newdesignsof supercon-ductingqubitsbasedonmulti-junct ioncircuitshave solvedtheproblemof thisreviewhow qubitdecoherenceis a ectedby theintrinsicnoiseof thejunctionandwhatcanbe doneto improve implementinga quantumcomputer.

Superconducting junctions and wires are fabricated using techniques borrowed from conventional integrated circuits3. Quantum circuits are typically made on silicon wafers using optical or electron-beam lithography and thin lm deposi-tion. They present themselves as a set of micron-size or sub-micron-size circuit

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