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| Author |
Tang, Liang; Kocabas, Sukru Ekin; Latif, Salman; Okyay, Ali K.; Ly-Gagnon, Dany-Sebastien; Saraswat, Krishna C.; Miller, David A. B. |
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Nanometre-scale germanium photodetector enhanced by a near-infrared dipole antenna |
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Journal Article |
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2008 |
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Nature Photonics |
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2 |
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226-229 |
| Keywords |
optical antennas |
| Abstract |
A critical challenge for the convergence of optics and electronics is that the micrometre scale of optics is significantly larger than the nanometre scale of modern electronic devices. In the conversion from photons to electrons by photodetectors, this size incompatibility often leads to substantial penalties in power dissipation, area, latency and noise. A photodetector can be made smaller by using a subwavelength active region; however, this can result in very low responsivity because of the diffraction limit of the light. Here we exploit the idea of a half-wave Hertz dipole antenna (length approx 380 nm) from radio waves, but at near-infrared wavelengths (length approx 1.3 microm), to concentrate radiation into a nanometre-scale germanium photodetector. This gives a polarization contrast of a factor of 20 in the resulting photocurrent in the subwavelength germanium element, which has an active volume of 0.00072 microm3, a size that is two orders of magnitude smaller than previously demonstrated detectors at such wavelengths. |
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858 |
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Hadfield, Robert H. |
| Title |
Single-photon detectors for optical quantum information applications |
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Journal Article |
| Year |
2009 |
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Nature Photonics |
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Nature Photonics |
| Volume |
3 |
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Pages |
696-705 |
| Keywords |
SPD |
| Abstract |
The past decade has seen a dramatic increase in interest in new single-photon detector technologies. A major cause of this trend has undoubtedly been the push towards optical quantum information applications such as quantum key distribution. These new applications place extreme demands on detector performance that go beyond the capabilities of established single-photon detectors. There has been considerable effort to improve conventional photon-counting detectors and to transform new device concepts into workable technologies for optical quantum information applications. This Review aims to highlight the significant recent progress made in improving single-photon detector technologies, and the impact that these developments will have on quantum optics and quantum information science. |
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RPLAB @ gujma @ |
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678 |
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| Author |
Zurek, Wojciech Hubert |
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Quantum Darwinism |
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Journal Article |
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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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3 |
Pages |
181-188 |
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fromIPMRAS |
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Quantum Darwinism describes the proliferation, in the environment, of multiple records of selected states of a quantum system. It explains how the quantum fragility of a state of a single quantum system can lead to the classical robustness of states in their correlated multitude; shows how effective `wave-packet collapse' arises as a result of the proliferation throughout the environment of imprints of the state of the system; and provides a framework for the derivation of Born's rule, which relates the probabilities of detecting states to their amplitudes. Taken together, these three advances mark considerable progress towards settling the quantum measurement problem. |
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799 |
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Shor, Peter W. |
| Title |
Quantum information theory: The bits don't add up |
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Journal Article |
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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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Trabesinger, Andreas |
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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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