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Author |
Fuchs, G. D.; Burkard, G.; Klimov, P. V.; Awschalom, D. D. |
Title |
A quantum memory intrinsic to single nitrogen–vacancy centres in diamond |
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Journal Article |
Year |
2011 |
Publication |
Nature Physics |
Abbreviated Journal |
Nat. Phys. |
Volume |
7 |
Issue |
10 |
Pages |
789-793 |
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fromIPMRAS |
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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RPLAB @ gujma @ |
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823 |
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Author |
Gabay, Marc; Triscone, Jean-Marc |
Title |
Superconductors: Terahertz superconducting switch |
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Journal Article |
Year |
2011 |
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Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
Volume |
5 |
Issue |
8 |
Pages |
447-449 |
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fromIPMRAS |
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The use of terahertz pulses to 'gate' interlayer charge transport in a superconductor could lead to a variety of new and interesting applications. |
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RPLAB @ gujma @ |
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777 |
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Author |
Gao, Jie; McMillan, James F.; Wong, Chee Wei |
Title |
Nanophotonics: Remote on-chip coupling |
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Journal Article |
Year |
2012 |
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Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
Volume |
6 |
Issue |
1 |
Pages |
7-8 |
Keywords |
fromIPMRAS |
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Scientists have demonstrated strongly coupled photon states between two distant high-Q photonic crystal cavities connected by a photonic crystal waveguide. Remote dynamic control over the coupled states could aid the development of delay lines, optical buffers and qubit operations in both classical and quantum information processing. |
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779 |
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Ghali, Mohsen; Ohtani1, Keita; Ohno, Yuzo; Ohno, Hideo |
Title |
Generation and control of polarization-entangled photons from GaAs island quantum dots by an electric field |
Type |
Journal Article |
Year |
2012 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Comm. |
Volume |
3 |
Issue |
661 |
Pages |
6 |
Keywords |
fromIPMRAS |
Abstract |
Semiconductor quantum dots are potential sources for generating polarization-entangled photons efficiently. The main prerequisite for such generation based on biexciton-exciton cascaded emission is to control the exciton fine-structure splitting. Among various techniques investigated for this purpose, an electric field is a promising means to facilitate the integration into optoelectronic devices. Here we demonstrate the generation of polarization-entangled photons from single GaAs quantum dots by an electric field. In contrast to previous studies, which were limited to In(Ga)As quantum dots, GaAs island quantum dots formed by a thickness fluctuation were used because they exhibit a larger oscillator strength and emit light with a shorter wavelength. A forward voltage was applied to a Schottky diode to control the fine-structure splitting. We observed a decrease and suppression in the fine-structure splitting of the studied single quantum dot with the field, which enabled us to generate polarization-entangled photons with a high fidelity of 0.72 ± 0.05. |
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RPLAB @ gujma @ |
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769 |
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Author |
Goulielmakis, Eleftherios |
Title |
Attosecond photonics: Extreme ultraviolet catastrophes |
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Journal Article |
Year |
2012 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
Volume |
6 |
Issue |
3 |
Pages |
142-143 |
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fromIPMRAS |
Abstract |
Extreme ultraviolet attosecond pulses, which emerge from the interaction of atoms with intense laser fields, play a central role in modern ultrafast science and the exploration of electron behaviour. Recent work now shows that catastrophe theory can help optimize the properties of these pulses. |
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RPLAB @ gujma @ |
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791 |
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