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| Author |
Brida, G.; Genovese, M.; Ruo Berchera, I. |
| Title |
Experimental realization of sub-shot-noise quantum imaging |
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Journal Article |
| Year |
2010 |
Publication |
Nature Photonics |
Abbreviated Journal  |
Nat. Photon. |
| Volume |
4 |
Issue |
4 |
Pages |
227-230 |
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fromIPMRAS |
| Abstract |
The properties of quantum states have led to the development of new technologies, ranging from quantum information to quantum metrology. A recent field of research to emerge is quantum imaging, which aims to overcome the limits of classical imaging by making use of the spatial properties of quantum states of light . In particular, quantum correlations between twin beams represent a fundamental resource for these studies. One of the most interesting proposed schemes takes advantage of the spatial quantum correlations between parametric down-conversion light beams to realize sub-shot-noise imaging of weak absorbing objects, leading ideally to noise-free imaging. Here, we present the first experimental realization of this scheme, showing its potential to achieve a larger signal-to-noise ratio than classical imaging methods. This work represents the starting point for this quantum technology, which we anticipate will have applications when there is a requirement for low-photon-flux illumination (for example for use with biological samples). |
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RPLAB @ gujma @ |
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771 |
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| Author |
Kok, Pieter |
| Title |
Quantum optics: Entangled photons report for duty |
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Journal Article |
| Year |
2010 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
| Volume |
4 |
Issue |
8 |
Pages |
504-505 |
| Keywords |
fromIPMRAS |
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Entangled photons are a key ingredient in optical quantum technologies, but researchers have so far been unable to produce a single pair of entangled photons. Now, two groups from China and Austria independently report just that, with a technique that avoids the need to infer entanglement from detection signatures. |
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RPLAB @ gujma @ |
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772 |
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Bonifas, Andrew P.; McCreery, Richard L. |
| Title |
‘Soft’ Au, Pt and Cu contacts for molecular junctions through surface-diffusion-mediated deposition |
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Journal Article |
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2010 |
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Nature Nanotechnology |
Abbreviated Journal |
Nat. Nanotech. |
| Volume |
5 |
Issue |
8 |
Pages |
612–617 |
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Virtually all types of molecular electronic devices depend on electronically addressing a molecule or molecular layer through the formation of a metallic contact. The introduction of molecular devices into integrated circuits will probably depend on the formation of contacts using a vapour deposition technique, but this approach frequently results in the metal atoms penetrating or damaging the molecular layer. Here, we report a method of forming 'soft' metallic contacts on molecular layers through surface-diffusion-mediated deposition, in which the metal atoms are deposited remotely and then diffuse onto the molecular layer, thus eliminating the problems of penetration and damage. Molecular junctions fabricated by this method exhibit excellent yield (typically >90%) and reproducibility, and allow examination of the effects of molecular-layer structure, thickness and contact work function. |
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RPLAB @ gujma @ |
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682 |
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Freer, Erik M.; Grachev, Oleg; Duan, Xiangfeng; Martin, Samuel; Stumbo, David P. |
| Title |
High-yield self-limiting single-nanowire assembly with dielectrophoresis |
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Journal Article |
| Year |
2010 |
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Nature Nanotechnology |
Abbreviated Journal |
Nat. Nanotech. |
| Volume |
5 |
Issue |
7 |
Pages |
525–530 |
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Single-crystal nanowire transistors and other nanowire-based devices could have applications in large-area and flexible electronics if conventional top-down fabrication techniques can be integrated with high-precision bottom-up nanowire assembly. Here, we extend dielectrophoretic nanowire assembly to achieve a 98.5% yield of single nanowires assembled over 16,000 patterned electrode sites with submicrometre alignment precision. The balancing of surface, hydrodynamic and dielectrophoretic forces makes the self-assembly process controllable, and a hydrodynamic force component makes it self-limiting. Our approach represents a methodology to quantify nanowire assembly, and makes single nanowire assembly possible over an area limited only by the ability to reproduce process conditions uniformly. |
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RPLAB @ gujma @ |
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683 |
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| Author |
Konstantatos, Gerasimos; Sargent, Edward H. |
| Title |
Nanostructured materials for photon detection |
Type |
Journal Article |
| Year |
2010 |
Publication |
Nature Nanotechnology |
Abbreviated Journal |
Nat. Nanotech. |
| Volume |
5 |
Issue |
6 |
Pages |
391–400 |
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The detection of photons underpins imaging, spectroscopy, fibre-optic communications and time-gated distance measurements. Nanostructured materials are attractive for detection applications because they can be integrated with conventional silicon electronics and flexible, large-area substrates, and can be processed from the solution phase using established techniques such as spin casting, spray coating and layer-by-layer deposition. In addition, their performance has improved rapidly in recent years. Here we review progress in light sensing using nanostructured materials, focusing on solution-processed materials such as colloidal quantum dots and metal nanoparticles. These devices exhibit phenomena such as absorption of ultraviolet light, plasmonic enhancement of absorption, size-based spectral tuning, multiexciton generation, and charge carrier storage in surface and interface traps. |
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RPLAB @ gujma @ |
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684 |
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