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Brown, E. R.; Lee, A. W. M.; Navi, B. S.; Bjarnason, J. E. |
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Characterization of a planar self-complementary square-spiral antenna in the THz region |
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Journal Article |
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2006 |
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Microwave and Optical Technology Letters |
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Microwave Opt Technol Lett |
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48 |
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3 |
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524-529 |
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optical antennas; square spiral antenna; self complementary THz; photomixing; lens; method of moments; geometric optics; physical optics |
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This paper describes a compact, self-complementary square-spiral antenna on a GaAs substrate with a broadside high-directivity (~9 dB) frequency-independent pattern when coupled through a silicon hyperhemisphere. The driving-point resistance undulates between ~00 and 300Ω from 200 GHz to 1 THz—much higher than the 72Ω value from Booker's modified formula, but quite beneficial for coupling to high-impedance broadband devices |
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RPLAB @ gujma @ |
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736 |
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Zhang, Qiang; Goebel, Alexander; Wagenknecht, Claudia; Chen, Yu-Ao; Zhao, Bo; Yang, Tao; Mair, Alois; Schmiedmayer, Jörg; Pan, Jian-Wei |
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Title |
Experimental quantum teleportation of a two-qubit composite system |
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Journal Article |
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2006 |
Publication |
Nature Physics |
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Nat. Phys. |
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2 |
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10 |
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678-682 |
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fromIPMRAS; quantum teleportation |
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Quantum teleportation, a way to transfer the state of a quantum system from one location to another, is central to quantum communication and plays an important role in a number of quantum computation protocols. Previous experimental demonstrations have been implemented with single photonic or ionic qubits. However, teleportation of single qubits is insufficient for a large-scale realization of quantum communication and computation. Here, we present the experimental realization of quantum teleportation of a two-qubit composite system. In the experiment, we develop and exploit a six-photon interferometer to teleport an arbitrary polarization state of two photons. The observed teleportation fidelities for different initial states are all well beyond the state estimation limit of 0.40 for a two-qubit system. Not only does our six-photon interferometer provide an important step towards teleportation of a complex system, it will also enable future experimental investigations on a number of fundamental quantum communication and computation protocols |
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RPLAB @ gujma @ |
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795 |
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ГОСТ 2.120-73. ЕСКД. Технический проект |
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2006 |
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gost, detproj |
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860 |
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ГОСТ 2.501-88. ЕСКД. Правила учета и хранения |
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2006 |
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862 |
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ГОСТ 3.1102-81. ЕСТД. Стадии разработки и виды документов |
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2006 |
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no |
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868 |
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ГОСТ 3.1121-84. ЕСТД. Общие требования к комплектности и оформлению документов на типовые и групповые технологические процессы (операции) |
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2006 |
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gost, detproj |
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870 |
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Author |
Irwin, K.D. |
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Title |
Thermodynamics of nonlinear bolometers near equilibrium |
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2006 |
Publication |
Proc. 11th International Workshop on Low Temp. Detectors |
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Proc. 11th International Workshop on Low Temp. Detectors |
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559 |
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2 |
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718-720 |
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bolometers, microcalorimeters, nonlinear thermodynamics, nonequilibrium |
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We present the first thermodynamically correct calculation of the noise in a simple nonlinear resistive bolometer or calorimeter operated out of equilibrium. The solution is rigorous only for first- and second-order deviations from equilibrium, and for the linear and quadratic terms of dissipative elements. In contrast, existing models of noise in resistive bolometers are based on the application of equilibrium theories to a system that is often nonlinear and out of equilibrium. We derive solutions applicable both in and out of steady state. The noise has power spectral density different from the equilibrium theory, and it has higher-order correlations and non-Gaussian characteristics. The results do not apply to non-Markovian hidden variables in the bolometer. |
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Recommended by Klapwijk |
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915 |
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Baryshev A.; Hovenier J.N.; Adam A.J.L.; Kašalynas I.; Gao J.R.; Klaassen T.O.; Williams B.S.; Kumar S.; Hu Q.; Reno J.L. |
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Title |
Phase locking and spectral linewidth of a two-mode terahertz quantum cascade laser |
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2006 |
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Physics Letters |
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89 |
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We have studied the phase locking and spectral linewidth of an ~ 2.7 THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8 GHz is compared with a microwave eference by applying conventional phase lock loop circuitry with feedback to the laser bias current. Phase locking has been demonstrated, resulting in a narrow beat linewidth of less than 10 Hz. Under requency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ~ 6.3 kHz. Power dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit. |
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RPLAB @ atomics90 @ |
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967 |
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Hovenier J.N.; Adam A.J.L.; Kašalynas I.; Gao J.R.; Klaassen T.O.; Baryshev A.; Williams B.S.; Kumar S.; Hu Q.; Reno J.L. |
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Phase-locking on the beat signal of a two-mode 2.7 terahertz metal-metal quantum cascade laser |
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2006 |
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Proc. Symp. IEEE/LEOS Benelux Chapter |
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125-128 |
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We have studied the linewidth and phase-locking of a 2.7 THz quantum cascade laser by using a superconducting bolometer mixer. The 8 GHz beat signal is compared with a microwave reference with a feedback to the laser bias current. Phase locking has been demonstrated, resulting in an extremely narrow beat linewidth of less than 10 Hz. Under frequency-stabilization conditions we find that the line profile is virtually Lorentzian with a long-term minimum linewidth of the THz modes of about 6.3 kHz. Temperature dependent measurements suggestthat this linewidthdoes not approach the Schawlow-Townes limit. |
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RPLAB @ atomics90 @ |
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968 |
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Chulkova, G.; Milostnaya, I.; Tarkhov, M.; Korneev, A.; Minaeva, O.; Voronov, B.; Divochiy, A.; Gol'tsman, G.; Kitaygorsky, J.; Pan, D.; Sobolewski, R. |
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Superconducting single-photon nanostructured detectors for advanced optical applications |
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2006 |
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Proc. Symposium on Photonics Technologies for 7th Framework Program |
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400 |
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SSPD, SNSPD |
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We present superconducting single-photon detectors (SSPDs) based on NbN thin-film nanostructures and operated at liquid helium temperatures. The SSPDs are made of ultrathin NbN films (2.5-4 nm thick, Tc= 9-11K) as meander-shaped nanowires covering the area of 10× 10 µm2. Our detectors are operated at the temperature well below the critical temperature Tc and are DC biased by a current Ib close to the meander critical current Ic. The operation principle of the detector is based on the use of the resistive region in a narrow ultra-thin superconducting stripe upon the absorption of an incident photon. The developed devices demonstrate high sensitivity and response speed in a broadband range from UV to mid-IR (up to 6 µm), making them very attractive for advanced optical technologies, which require efficient detectors of single quanta and low-density optical radiation. |
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RPLAB @ sasha @ chulkova2006superconducting |
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1021 |
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