893 research outputs found
Karte des Kaisergebirges
No full texttopgraphische Aufnahme u. Zeichnung v. L. Aegerter unter Benützung der stereophotogrammetr. Aufnahme v. F. Scheck und der Karten des k.u.k. Militärgeographischen Instituts, hrsg. v. Deutschen u. Oesterr. Alpen-Verein mit Erlaubnis des k.u.k. Kriegsministeriums ; Geländestich v. H. Rohn ; Namenberichtigung von Dr. L. Distel, Dr. G. Leuchs, Prof. Dr. Schatz u. Prof. R. Sinwel ; Seenlotungen von Dr. Joh. Müllne
Special issue dedicated to Professor Herbert Walther on his 70th Birth Anniversary - Happy Birthday, Herbert!
No full textOn lossless quantum data compression and quantum variable-length codes
No full textAhlswede R, Cai N. On lossless quantum data compression and quantum variable-length codes. In: Leuchs G, Beth T, eds. Quantum Information Processing. Weinheim: Wiley-VCH; 2003: 66-78
Holonomic quantum computation
No full textIn this brief review we describe the idea of holonomic quantum computation. The idea of geometric phase and holonomy is introduced in a general way and we provide few examples that should help the reader understand the issues involve
Mode structure and photon number correlations in squeezed quantum pulses
No full textThe question of an efficient multimode description of optical pulses is studied. We show that a relatively very small number of nonmonochromatic modes can be sufficient for a complete quantum description of pulses with Gaussian quadrature statistics. For example, a three-mode description was enough to reproduce the experimental data of photon number correlations in optical solitons [S. Spalter, N. Korolkova, F. Konig, A. Sizmann, and G. Leuchs, Phys. Rev. Lett. 81, 786 (1998)]. This approach is very useful for a detailed understanding of squeezing properties of soliton pulses with the main potential for quantum communication with continuous variables. We show how homodyne detection and/or measurements of photon number correlations can be used to determine the quantum state of the multimode field. We also discuss a possible way of physical separation of the nonmonochromatic modes
Experimental quantum cloning with continuous variable
No full textIn this chapter we present a scheme for optimal Gaussian cloning of optical coherent states. Its optical realization is based entirely on simple linear optical elements and homodyne detection. This is in contrast to previous proposals where parametric processes were suggested to be used for optimal Gaussian cloning. The optimality of the presented scheme is only limited by detection inefficiencies. Experimentally we achieved a cloning fidelity of up to 65%, which almost touches the optimal value of 2/3
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