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Haviland, David |
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Title |
Superconducting circuits: Quantum phase slips |
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2010 |
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Nature Physics |
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Nat. Phys. |
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6 |
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565–566 |
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fromIPMRAS |
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Coulomb interactions can cause a rapid change in the phase of the wavefunction along a very narrow superconducting system. Such a phase slip at the quantum level is now measured in a chain of Josephson junctions. |
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RPLAB @ gujma @ |
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807 |
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He, Rongrui; Sazio, Pier J. A.; Peacock, Anna C.; Healy, Noel; Sparks, Justin R.; Krishnamurthi, Mahesh; Gopalan, Venkatraman; Badding, John V. |
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Integration of gigahertz-bandwidth semiconductor devices inside microstructured optical fibres |
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Journal Article |
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2012 |
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Nature Photonics |
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Nat. Photon. |
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6 |
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3 |
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174-179 |
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fromIPMRAS |
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The prospect of an all-fibre optical communications network in which light can be generated, modulated and detected within the fibre itself without the need for discrete optoelectronic devices is an appealing one. However, to become a reality, this approach requires the incorporation of optoelectronic materials and functionalities into silica fibres to create a new breed of semiconductor-fibre hybrid devices for performing various tasks. Here, we report the integration of precisely doped semiconductor materials and high-quality rectifying semiconductor junctions into microstructured optical fibres, enabling high-speed, in-fibre functionalities such as photodetection at telecommunications wavelengths. These semiconductor-fibre hybrid devices exhibit a bandwidth of up to 3 GHz and seamless coupling to standard single-mode optical fibres. |
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RPLAB @ gujma @ |
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783 |
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Hollenberg, Lloyd C. L. |
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Quantum control: Through the quantum chicane |
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Journal Article |
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2012 |
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Nature Physics |
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Nat. Phys. |
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8 |
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2 |
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113-114 |
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fromIPMRAS |
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In quantum control there is an inherent tension between high fidelity requirements and the need for speed to avoid decoherence. A direct comparison of quantum control protocols at these two extremes indicates where the sweet spot may lie. |
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812 |
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Home, Jonathan |
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Quantum entanglement: Watching correlations disappear |
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2010 |
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Nature Physics |
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Nat. Phys. |
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6 |
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12 |
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938-939 |
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fromIPMRAS |
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Engineered decoherence enables tracking of multipartite entanglement as a quantum state decays. |
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RPLAB @ gujma @ |
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832 |
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Hosseini, M.; Campbell, G.; Sparkes, B. M.; Lam, P. K.; Buchler, B. C. |
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Title |
Unconditional room-temperature quantum memory |
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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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794-798 |
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fromIPMRAS |
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Just as classical information systems require buffers and memory, the same is true for quantum information systems. The potential that optical quantum information processing holds for revolutionizing computation and communication is therefore driving significant research into developing optical quantum memory. A practical optical quantum memory must be able to store and recall quantum states on demand with high efficiency and low noise. Ideally, the platform for the memory would also be simple and inexpensive. Here, we present a complete tomographic reconstruction of quantum states that have been stored in the ground states of rubidium in a vapour cell operating at around 80 °C. Without conditional measurements, we show recall fidelity up to 98% for coherent pulses containing around one photon. To unambiguously verify that our memory beats the quantum no-cloning limit we employ state-independent verification using conditional variance and signal-transfer coefficients. |
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RPLAB @ gujma @ |
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824 |
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