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Billangeon, P.-M.; Nakamura, Y. |
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Title |
Superconducting devices: Quantum cups and balls |
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2011 |
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Nature Physics |
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Nat. Phys. |
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7 |
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8 |
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594-595 |
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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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RPLAB @ gujma @ |
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820 |
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Fuchs, G. D.; Burkard, G.; Klimov, P. V.; Awschalom, D. D. |
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Title |
A quantum memory intrinsic to single nitrogen–vacancy centres in diamond |
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Journal Article |
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2011 |
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Nature Physics |
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Nat. Phys. |
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7 |
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10 |
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789-793 |
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fromIPMRAS |
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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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823 |
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Shor, Peter W. |
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Title |
Quantum information theory: The bits don't add up |
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2009 |
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Nature Physics |
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Nat. Phys. |
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5 |
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247 - 248 |
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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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800 |
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Vishveshwara, Smitha |
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Title |
Topological qubits: A bit of both |
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2011 |
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Nature Physics |
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Nat. Phys. |
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7 |
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450–451 |
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'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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RPLAB @ gujma @ |
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825 |
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Trabesinger, Andreas |
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Title |
Quantum mechanics: Shaken foundations |
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2009 |
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Nature Physics |
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Nat. Phys. |
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5 |
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12 |
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863 |
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RPLAB @ gujma @ |
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802 |
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