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schemename="dnet:result_subject">Condensed Matter - Mesoscale and Nanoscale
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Physics</subject>
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schemename="dnet:result_subject">Quantum Physics</subject>
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<title classid="main title" classname="main title" schemeid="dnet:dataCite_title"
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schemename="dnet:dataCite_title">Deterministic entanglement of superconducting qubits by
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parity measurement and feedback</title>
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<dateofacceptance>2013-06-17</dateofacceptance>
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schemename="dnet:result_typologies"/>
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<journal issn="0028-0836" eissn="1476-4687" lissn="">Nature</journal>
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<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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