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xsi:schemaLocation="http://namespace.openaire.eu/oaf ../oaf-publication-1.1.xsd">
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<oaf:subject type="keyword">Condensed Matter - Mesoscale and Nanoscale
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Physics</oaf:subject>
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<oaf:subject type="keyword">Quantum Physics</oaf:subject>
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<oaf:title>Deterministic entanglement of superconducting qubits by
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parity measurement and feedback</oaf:title>
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<oaf:dateofacceptance>2013-06-17</oaf:dateofacceptance>
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<oaf:resulttype>publication</oaf:resulttype>
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<oaf:language code="eng">English</oaf:language>
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<oaf:journal issn="0028-0836" eissn="1476-4687" lissn="">Nature</oaf:journal>
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<oaf:description> The stochastic evolution of quantum systems during measurement is arguably
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the most enigmatic feature of quantum mechanics. Measuring a quantum system
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typically steers it towards a classical state, destroying any initial quantum
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superposition and any entanglement with other quantum systems. Remarkably, the
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measurement of a shared property between non-interacting quantum systems can
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generate entanglement starting from an uncorrelated state. Of special interest
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in quantum computing is the parity measurement, which projects a register of
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quantum bits (qubits) to a state with an even or odd total number of
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excitations. Crucially, a parity meter must discern the two parities with high
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fidelity while preserving coherence between same-parity states. Despite
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numerous proposals for atomic, semiconducting, and superconducting qubits,
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realizing a parity meter creating entanglement for both even and odd
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measurement results has remained an outstanding challenge. We realize a
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time-resolved, continuous parity measurement of two superconducting qubits
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using the cavity in a 3D circuit quantum electrodynamics (cQED) architecture
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and phase-sensitive parametric amplification. Using postselection, we produce
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entanglement by parity measurement reaching 77% concurrence. Incorporating the
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parity meter in a feedback-control loop, we transform the entanglement
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generation from probabilistic to fully deterministic, achieving 66% fidelity to
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a target Bell state on demand. These realizations of a parity meter and a
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feedback-enabled deterministic measurement protocol provide key ingredients for
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active quantum error correction in the solid state.
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</oaf:description>
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<oaf:source>Nature</oaf:source>
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<oaf:publisher/>
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<oaf:embargoenddate/>
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<oaf:originalId>10.1038/nature12513</oaf:originalId>
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<oaf:originalId>oai:arXiv.org:1306.4002</oaf:originalId>
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id="opendoar____::6f4922f45568161a8cdf4ad2299f6d23"/>
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<oaf:pid type="doi">10.1038/nature12513</oaf:pid>
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<oaf:pid type="oai">oai:arXiv.org:1306.4002</oaf:pid>
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<oaf:bestaccessrights code="OPEN">Open Access</oaf:bestaccessrights>
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<oaf:rels>
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<oaf:rel inferred="false"
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provenance="sysimport:crosswalk:repository" semantics="hasAuthor">
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<oaf:ranking>8</oaf:ranking>
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<oaf:fullname>Schouten R.N.</oaf:fullname>
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</oaf:target>
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</oaf:rel>
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<oaf:rel inferred="true" semantics="isProducedBy"
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provenance="sysimport:crosswalk:repository">
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<oaf:code>600927</oaf:code>
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<oaf:acronym>SCALEQIT</oaf:acronym>
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<oaf:projecttitle>Scalable Superconducting Processors for Entangled Quantum Information
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Technology</oaf:projecttitle>
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<oaf:contracttype code="CP">Collaborative project</oaf:contracttype>
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<oaf:funding>
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<oaf:funder id="ec__________::EC"
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shortname="EC"
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name="European Commission"
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jurisdiction="EU"/>
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<oaf:url>http://dx.doi.org/10.1038/nature12513</oaf:url>
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