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Author |
Nozaki, Kengo; Shinya, Akihiko; Matsuo, Shinji; Suzaki, Yasumasa; Segawa, Toru; Sato, Tomonari; Kawaguchi, Yoshihiro; Takahashi, Ryo; Notomi, Masaya |
Title |
Ultralow-power all-optical RAM based on nanocavities |
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Journal Article |
Year |
2012 |
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Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
Volume |
6 |
Issue |
4 |
Pages |
248-252 |
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fromIPMRAS |
Abstract |
Optical random-access memory (o-RAM) has been regarded as one of the most difficult challenges in terms of replacing its various functionalities in electronic circuitry with their photonic counterparts. Nevertheless, it constitutes a key device in optical routing and processing. Here, we demonstrate that photonic crystal nanocavities with an ultrasmall buried heterostructure design can solve most of the problems encountered in previous o-RAMs. By taking advantage of the strong confinement of photons and carriers and allowing heat to escape efficiently, we have realized all-optical RAMs with a power consumption of only 30 nW, which is more than 300 times lower than the previous record, and have achieved continuous operation. We have also demonstrated their feasibility in multibit integration. This paves the way for constructing a low-power large-scale o-RAM system that can handle high-bit-rate optical signals. |
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RPLAB @ gujma @ |
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786 |
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Swetz, D. S.; Bennett, D. A.; Irwin, K. D.; Schmidt, D. R.; Ullom, J. N. |
Title |
Current distribution and transition width in superconducting transition-edge sensors |
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Journal Article |
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2012 |
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Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
Volume |
101 |
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242603 |
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Present models of the superconducting-to-normal transition in transition-edge sensors (TESs) do not describe the current distribution within a biased TES. This distribution is complicated by normal-metal features that are integral to TES design. We present a model with one free parameter that describes the evolution of the current distribution with bias. To probe the current distribution experimentally, we fabricated TES devices with different current return geometries. Devices where the current return geometry mirrors current flow within the device have sharper transitions, thus allowing for a direct test of the current-flow model.Measurements from these devices show that current meanders through a TES low in the resistivetransition but flows across the normal-metal features by 40% of the normal-state resistance. Comparison of transition sharpness between device designs reveals that self-induced magnetic fields play an important role in determining the width of the superconducting transition. |
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TES, current distribution |
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Recommended by Klapwijk |
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930 |
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Usmani, Imam; Clausen, Christoph; Bussières, Félix; Sangouard, Nicolas; Afzelius, Mikael; Gisin, Nicolas |
Title |
Heralded quantum entanglement between two crystals |
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Journal Article |
Year |
2012 |
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Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
Volume |
6 |
Issue |
4 |
Pages |
234-237 |
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fromIPMRAS |
Abstract |
Quantum networks must have the crucial ability to entangle quantum nodes. A prominent example is the quantum repeater, which allows the distance barrier of direct transmission of single photons to be overcome, provided remote quantum memories can be entangled in a heralded fashion. Here, we report the observation of heralded entanglement between two ensembles of rare-earth ions doped into separate crystals. A heralded single photon is sent through a 50/50 beamsplitter, creating a single-photon entangled state delocalized between two spatial modes. The quantum state of each mode is subsequently mapped onto a crystal, leading to an entangled state consisting of a single collective excitation delocalized between two crystals. This entanglement is revealed by mapping it back to optical modes and by estimating the concurrence of the retrieved light state. Our results highlight the potential of crystals doped with rare-earth ions for entangled quantum nodes and bring quantum networks based on solid-state resources one step closer. |
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RPLAB @ gujma @ |
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793 |
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Pile, David |
Title |
How many bits can a photon carry |
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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 |
Issue |
1 |
Pages |
14-15 |
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fromIPMRAS |
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Quantum physics offers a way to enhance the amount of information a photon can carry, with potential applications in optical communication, lithography, metrology and imaging. |
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View from... OSA Frontiers in Optics 2011: How many bits can a photon carry? |
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no |
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RPLAB @ gujma @ |
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780 |
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Smith, Devin H.; Gillett, Geoff; de Almeida, Marcelo P.; Branciard, Cyril; Fedrizzi, Alessandro; Weinhold, Till J.; Lita, Adriana; Calkins, Brice; Gerrits, Thomas; Wiseman, Howard M.; Nam, Sae Woo; White, Andrew G. |
Title |
Conclusive quantum steering with superconducting transition-edge sensors |
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Journal Article |
Year |
2012 |
Publication |
Nature Communications |
Abbreviated Journal |
Nat. Comm. |
Volume |
3 |
Issue |
625 |
Pages |
6 |
Keywords |
fromIPMRAS |
Abstract |
Quantum steering allows two parties to verify shared entanglement even if one measurement device is untrusted. A conclusive demonstration of steering through the violation of a steering inequality is of considerable fundamental interest and opens up applications in quantum communication. To date, all experimental tests with single-photon states have relied on post selection, allowing untrusted devices to cheat by hiding unfavourable events in losses. Here we close this 'detection loophole' by combining a highly efficient source of entangled photon pairs with superconducting transition-edge sensors. We achieve an unprecedented ~62% conditional detection efficiency of entangled photons and violate a steering inequality with the minimal number of measurement settings by 48 s.d.s. Our results provide a clear path to practical applications of steering and to a photonic loophole-free Bell test. |
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RPLAB @ gujma @ |
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768 |
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Tassin, Philippe; Koschny, Thomas; Kafesaki, Maria; Soukoulis, Costas M. |
Title |
A comparison of graphene, superconductors and metals as conductors for metamaterials and plasmonics |
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Journal Article |
Year |
2012 |
Publication |
Nature Photonics |
Abbreviated Journal |
Nat. Photon. |
Volume |
6 |
Issue |
4 |
Pages |
259-264 |
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fromIPMRAS |
Abstract |
Recent advancements in metamaterials and plasmonics have promised a number of exciting applications, in particular at terahertz and optical frequencies. Unfortunately, the noble metals used in these photonic structures are not particularly good conductors at high frequencies, resulting in significant dissipative loss. Here, we address the question of what is a good conductor for metamaterials and plasmonics. For resonant metamaterials, we develop a figure-of-merit for conductors that allows for a straightforward classification of conducting materials according to the resulting dissipative loss in the metamaterial. Application of our method predicts that graphene and high-Tc superconductors are not viable alternatives for metals in metamaterials. We also provide an overview of a number of transition metals, alkali metals and transparent conducting oxides. For plasmonic systems, we predict that graphene and high-Tc superconductors cannot outperform gold as a platform for surface plasmon polaritons, because graphene has a smaller propagation length-to-wavelength ratio. |
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RPLAB @ gujma @ |
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790 |
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Author |
Xu, XinAn; Wong, Chee Wei |
Title |
Quantum optics: Correlations on a chip |
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Journal Article |
Year |
2012 |
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Nature Photonics |
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Nat. Photon. |
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6 |
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75-76 |
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fromIPMRAS |
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Researchers have developed a semiconductor structure capable of supporting quantum correlations between photons and strong single-photon nonlinearities, thus paving the way for the development of chip-based devices for quantum secure communications and quantum information processing. |
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RPLAB @ gujma @ |
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782 |
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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 |
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Nat. Photon. |
Volume |
6 |
Issue |
1 |
Pages |
7-8 |
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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 |
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Generation and control of polarization-entangled photons from GaAs island quantum dots by an electric field |
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Journal Article |
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2012 |
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Nature Communications |
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Nat. Comm. |
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3 |
Issue |
661 |
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6 |
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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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Korneev, A.; Korneeva, Y.; Florya, I.; Voronov, B.; Goltsman, G. |
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NbN nanowire superconducting single-photon detector for mid-infrared |
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Journal Article |
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2012 |
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Phys. Procedia |
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Phys. Procedia |
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36 |
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72-76 |
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NbN SSPD, SNSPD |
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Superconducting single-photon detectors (SSPD) is typically 100 nm-wide supercondiucting strip in a shape of meander made of 4-nm-thick film. To reduce response time and increase voltage response a parallel connection of the strips was proposed. Recently we demonstrated that reduction of the strip width improves the quantum effciency of such a detector at wavelengths longer than 1.5 μm. Being encourage by this progress in quantum effciency we improved the fabrication process and made parallel-wire SSPD with 40-nm-wide strips covering total area of 10 μm x 10 μm. In this paper we present the results of the characterization of such a parallel-wire SSPD at 10.6 μm wavelength and demonstrate linear dependence of the count rate on the light power as it should be in case of single-photon response. |
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1875-3892 |
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1382 |
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Rasulova, G. K.; Brunkov, P. N.; Pentin, I. V.; Egorov, A. Y.; Knyazev, D. A.; Andrianov, A. V.; Zakhar’in, A. O.; Konnikov, S. G.; Gol’tsman, G. N. |
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A weakly coupled semiconductor superlattice as a potential for a radio frequency modulated terahertz light emitter |
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Journal Article |
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2012 |
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Appl. Phys. Lett. |
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Appl. Phys. Lett. |
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100 |
Issue |
13 |
Pages |
131104 (1 to 4) |
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semiconductor superlattice |
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The bolometer response to THz radiation from a weakly coupled GaAs/AlGaAs superlattice biased in the self-oscillations regime has been observed. The bolometer signal is modulated with the frequency equal to the fundamental frequency of superlattice self-oscillations. The frequency spectrum of the bolometer signal contains higher harmonics whose frequency is a multiple of fundamental frequency of self-oscillations.
This work was supported by State Contracts Nos. 16.740.11.0044 and 16.552.11.7002 of Ministry of Education and Science of the Russian Federation. Structural characterization was made on the equipment of the Joint Research Centre «Material science and characterization in advanced technology» (Ioffe Institute, St. Petersburg, Russia). |
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0003-6951 |
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Smirnov, A. V.; Karmantsov, M. S.; Smirnov, K. V.; Vakhtomin, Y. B.; Masterov, D. V.; Tarkhov, M. A.; Pavlov, S. A.; Parafin, A. E. |
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Terahertz response of thin-film YBCO bolometers |
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Journal Article |
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2012 |
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Tech. Phys. |
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Tech. Phys. |
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57 |
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12 |
Pages |
1716-1719 |
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YBCO HEB |
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The bolometric response of high-temperature thin-film YBCO superconducting detectors to an electromagnetic radiation with a frequency of 2.5 THz is measured for the first time. The minimum value of the noise-equivalent power of the detectors is 3.5 × 10−9 W/Hz−−−√. The feasibility of further increasing the sensitivity of the detectors is discussed. |
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Yao, Xing-Can; Wang, Tian-Xiong; Xu, Ping; Lu, He; Pan, Ge-Sheng; Bao, Xiao-Hui; Peng, Cheng-Zhi; Lu, Chao-Yang; Chen, Yu-Ao; Pan, Jian-Wei |
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Observation of eight-photon entanglement |
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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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4 |
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225-228 |
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fromIPMRAS |
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The creation of increasingly large multipartite entangled states is not only a fundamental scientific endeavour in itself, but is also the enabling technology for quantum information. Tremendous experimental effort has been devoted to generating multiparticle entanglement with a growing number of qubits. So far, up to six spatially separated single photons have been entangled based on parametric downconversion. Multiple degrees of freedom of a single photon have been exploited to generate forms of hyper-entangled states. Here, using new ultra-bright sources of entangled photon pairs, an eight-photon interferometer and post-selection detection, we demonstrate for the first time the creation of an eight-photon Schrödinger cat state with genuine multipartite entanglement. The ability to control eight individual photons represents a step towards optical quantum computation, and will enable new experiments on, for example, quantum simulation, topological error correction and testing entanglement dynamics under decoherence. |
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Schmidt, Markus A. |
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Integration: Fibres embrace optoelectronics |
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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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143-145 |
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The demonstration of an in-fibre semiconductor photodetector with gigahertz bandwidth bodes well for the future development of hybrid fibre optoelectronics. |
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789 |
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Santori, Charles; Beausoleil, Raymond G. |
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Quantum memory: Phonons in diamond crystals |
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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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10-12 |
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The demonstration that quantum information can be stored in a bulk-diamond crystal in the form of an optically excited phonon gives researchers a new type of mechanical solid-state quantum memory to explore. |
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RPLAB @ gujma @ |
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781 |
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