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Amzajerdian, Farzin |
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Analysis of optimum heterodyne receivers for coherent lidar applications |
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Miscellaneous |
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2002 |
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505 |
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Gisin, Nicolas; Ribordy, Grégoire; Tittel, Wolfgang; Zbinden, Hugo |
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Quantum cryptography |
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Journal Article |
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2002 |
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Reviews of Modern Physics |
Abbreviated Journal |
Rev. Mod. Phys. |
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74 |
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1 |
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145-195 |
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0034-6861 |
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506 |
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Uzawa, Y.; Miki, S.; Wang, Z.; Kawakami, A.; Kroug, M.; Yagoubov, P.; Kollberg, E. |
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Performance of a quasi-optical NbN hot-electron bolometric mixer at terahertz frequencies |
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Journal Article |
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2002 |
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Superconductor Science and Technology |
Abbreviated Journal |
Supercond. Sci. Technol. |
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15 |
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1 |
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141-145 |
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HEB, mixer |
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0953-2048 |
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RPLAB @ s @ |
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548 |
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Author |
Ito, Hiroshi |
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High frequency photodiode work in Japan |
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Manuscript |
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2002 |
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Report at NTT photonics laboratories |
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1-4 |
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THz, terahertz communications, photodiode |
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The recent progress in the device performance of the uni-traveling-carrier photodiode (UTC-PD) is described. The UTC-PD utilizes only electrons as the active carriers, and this unique feature is the key to achieving excellent high-speed and high-output characteristics simultaneously. The achieved performance includes a record 3-dB bandwidth of 310 GHz, high-power photonic millimeter-wave generation with an output power of over +13 dBm at 100 GHz, high-output-voltage photoreceiver operation at bit rates of up to 80 Gbit/s, and demultiplexing operation at 200 Gbit/s using a monolithic PD-EAM optical gate. |
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596 |
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Author |
Deang, Jennifer; Du, Qiang; Gunzburger, Max D. |
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Modeling and computation of random thermal fluctuations and material defects in the Ginzburg–Landau model for superconductivity |
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2002 |
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J. Comp. Phys. |
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181 |
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1 |
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45-67 |
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noise; superconductivity; finite element methods; fluctuations. |
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It is well known that thermal fluctuations and material impurities affect the motion of vortices in superconductors. These effects are modeled by variants of a time-dependent Ginzburg-Landau model containing either additive or multiplicative noise. Numerical computations are presented that illustrate the effects that noise has on the dynamics of vortex nucleation and vortex motion. For an additive noise model with relatively low variances, it is found that the vortices form a quasi-steady-state lattice in which the vortex core sizes remain roughly fixed but their positions vibrate. Two multiplicative noise models are considered. For one model having relatively long-range order, the sizes of the vortex cores vary in time and from one vortex to another. Finally, for the additive noise case, we show that as the variance of the noise tends to zero, solutions of the stochastic time-dependent Ginzburg-Landau equations converge to solutions of the corresponding equations with no noise. |
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RPLAB @ gujma @ |
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758 |
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