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000152159 0247_ $$2doi$$a10.1103/PhysRevA.89.032314
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000152159 1001_ $$0P:(DE-HGF)0$$aTornberg, L.$$b0$$eCorresponding Author
000152159 245__ $$aStochastic-master-equation analysis of optimized three-qubit nondemolition parity measurements
000152159 260__ $$aCollege Park, Md.$$bAPS$$c2014
000152159 264_1 $$2Crossref$$3online$$bAmerican Physical Society (APS)$$c2014-03-12
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000152159 520__ $$aWe analyzea direct parity measurement of the state of three superconducting qubits in circuit quantum electrodynamics. The parity is inferred from a homodyne measurement of the reflected and transmitted microwave radiation, and the measurement is direct in the sense that the parity is measured without the need for any quantum circuit operations or for ancilla qubits. Qubits are coupled to two resonant-cavity modes, allowing the steady state of the emitted radiation to satisfy the necessary conditions to act as a pointer state for the parity. However, the transient dynamics violates these conditions, and we analyze this detrimental effect and show that it can be overcome in the limit of a weak measurement signal. Our analysis shows that, with a moderate degree of postselection, it is possible to achieve postmeasurement states with fidelity of order 95%. We believe that this type of measurement could serve as a benchmark for future error correction protocols in a scalable architecture
000152159 536__ $$0G:(DE-HGF)POF2-422$$a422 - Spin-based and quantum information (POF2-422)$$cPOF2-422$$fPOF II$$x0
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000152159 7001_ $$0P:(DE-HGF)0$$aBarzanjeh, Sh.$$b1
000152159 7001_ $$0P:(DE-Juel1)143759$$aDiVincenzo, David$$b2$$ufzj
000152159 77318 $$2Crossref$$3journal-article$$a10.1103/physreva.89.032314$$bAmerican Physical Society (APS)$$d2014-03-12$$n3$$p032314$$tPhysical Review A$$v89$$x1050-2947$$y2014
000152159 773__ $$0PERI:(DE-600)2844156-4$$a10.1103/PhysRevA.89.032314$$gVol. 89, no. 3, p. 032314$$n3$$p032314$$tPhysical review / A$$v89$$x1050-2947$$y2014
000152159 8564_ $$yPublishers version according to licensing conditions.$$zPublished final document.
000152159 8564_ $$uhttps://juser.fz-juelich.de/record/152159/files/FZJ-2014-01940.pdf$$yOpenAccess$$zPublished final document.
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000152159 9132_ $$0G:(DE-HGF)POF3-144$$1G:(DE-HGF)POF3-140$$2G:(DE-HGF)POF3-100$$aDE-HGF$$bForschungsbereich Energie$$lFuture Information Technology - Fundamentals, Novel Concepts and Energy Efficiency (FIT)$$vControlling Collective States$$x0
000152159 9131_ $$0G:(DE-HGF)POF2-422$$1G:(DE-HGF)POF2-420$$2G:(DE-HGF)POF2-400$$3G:(DE-HGF)POF2$$4G:(DE-HGF)POF$$aDE-HGF$$bSchlüsseltechnologien$$lGrundlagen zukünftiger Informationstechnologien$$vSpin-based and quantum information$$x0
000152159 9141_ $$y2014
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000152159 9201_ $$0I:(DE-Juel1)PGI-2-20110106$$kPGI-2$$lTheoretische Nanoelektronik$$x0
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