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Billangeon P-M, Nakamura Y. Superconducting devices: Quantum cups and balls. Nat Phys. 2011;7(8):594–5.
Abstract: A single microwave photon in a superposition of two states of different frequency is now demonstrated using a superconducting quantum interference device to mediate the coupling between two harmonics of a resonator. Such quantum circuits bring closer the possibility of controlling photon-photon interactions at the single-photon level.
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Fuchs GD, Burkard G, Klimov PV, Awschalom DD. A quantum memory intrinsic to single nitrogen–vacancy centres in diamond. Nat Phys. 2011;7(10):789–93.
Abstract: A quantum memory, composed of a long-lived qubit coupled to each processing qubit, is important to building a scalable platform for quantum information science. These two qubits should be connected by a fast and high-fidelity operation to store and retrieve coherent quantum states. Here, we demonstrate a room-temperature quantum memory based on the spin of the nitrogen nucleus intrinsic to each nitrogen–vacancy (NV) centre in diamond. We perform coherent storage of a single NV centre electronic spin in a single nitrogen nuclear spin using Landau–Zener transitions across a hyperfine-mediated avoided level crossing. By working outside the asymptotic regime, we demonstrate coherent state transfer in as little as 120 ns with total storage fidelity of 88±6%. This work demonstrates the use of a quantum memory that is compatible with scaling as the nitrogen nucleus is deterministically present in each NV centre defect.
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Shor PW. Quantum information theory: The bits don't add up. Nat Phys. 2009;5:247–8.
Abstract: A counterexample to the 'additivity question', the most celebrated open problem in the mathematical theory of quantum information, casts doubt on the possibility of finding a simple expression for the information capacity of a quantum channel.
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Vishveshwara S. Topological qubits: A bit of both. Nat Phys. 2011;7:450–451.
Abstract: 'Standard' qubits have been implemented in diverse physical systems. Now, so-called topological qubits are coming into the limelight, and could potentially be used for decoherence-free quantum computing. Coupling these two types of qubit might enable devices that exploit the virtues of both.
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Trabesinger A. Quantum mechanics: Shaken foundations. Nat Phys. 2009;5(12):863.
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Hannay T. A new kind of science? Nat Phys. 2011;7:742.
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Buchanan M. Body of evidence. Vol 6.; 2010.
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Buchanan M. Nothing's impossible. Vol 7.; 2011.
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