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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:fullname>Schouten R.N.</oaf:fullname>
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            <oaf:projecttitle>Scalable Superconducting Processors for Entangled Quantum Information
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					Technology</oaf:projecttitle>
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