Search Results - "Marquardt, Ch"

Intracavity Squeezing Can Enhance Quantum-Limited Optomechanical Position Detection through Deamplification by Peano, V, Schwefel, H G L, Marquardt, Ch, Marquardt, F

“…It has been predicted and experimentally demonstrated that by injecting squeezed light into an optomechanical device, it is possible to enhance the precision…”
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Atmospheric continuous-variable quantum communication by Heim, B, Peuntinger, C, Killoran, N, Khan, I, Wittmann, C, Marquardt, Ch, Leuchs, G

“…We present a quantum communication experiment conducted over a point-to-point free-space link of 1.6 km in urban conditions. We study atmospheric influences on…”
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A robust quantum receiver for phase shift keyed signals by Müller, C R, Marquardt, Ch

“…The impossibility of perfectly discriminating non-orthogonal quantum states imposes far-reaching consequences both on quantum and classical communication…”
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Unfolding the Hong–Ou–Mandel interference between heralded photons from narrowband twin beams by Laiho, K, Dirmeier, T, Shafiee, G, Marquardt, Ch

“…Abstract The Hong–Ou–Mandel (HOM) interference is one of the most intriguing quantum optical phenomena and crucial in performing quantum optical communication…”
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Low-threshold optical parametric oscillations in a whispering gallery mode resonator by Fürst, J U, Strekalov, D V, Elser, D, Aiello, A, Andersen, U L, Marquardt, Ch, Leuchs, G

“…In whispering gallery mode (WGM) resonator light is guided by continuous total internal reflection along a curved surface. Fabricating such resonators from an…”
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Quantum light from a whispering-gallery-mode disk resonator by Fürst, J U, Strekalov, D V, Elser, D, Aiello, A, Andersen, U L, Marquardt, Ch, Leuchs, G

“…Optical parametric down-conversion has proven to be a valuable source of nonclassical light. The process is inherently able to produce twin-beam correlations…”
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Quadrature phase shift keying coherent state discrimination via a hybrid receiver by Müller, C R, Usuga, M A, Wittmann, C, Takeoka, M, Marquardt, Ch, Andersen, U L, Leuchs, G

“…We propose and experimentally demonstrate a near-optimal discrimination scheme for the quadrature phase shift keying (QPSK) protocol. We show in theory that…”
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The standard quantum limit of coherent beam combining by Müller, C R, Sedlmeir, F, Martynov, V O, Marquardt, Ch, Andrianov, A V, Leuchs, G

“…Coherent beam combining refers to the process of generating a bright output beam by merging independent input beams of individually diffusing relative phases…”
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Reduction of guided acoustic wave Brillouin scattering in photonic crystal fibers by Elser, D, Andersen, U L, Korn, A, Glöckl, O, Lorenz, S, Marquardt, Ch, Leuchs, G

“…Guided acoustic wave Brillouin scattering (GAWBS) generates phase and polarization noise of light propagating in glass fibers. This excess noise affects the…”
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Distillation of squeezing from non-Gaussian quantum states by Heersink, J, Marquardt, Ch, Dong, R, Filip, R, Lorenz, S, Leuchs, G, Andersen, U L

“…We show that single copy distillation of squeezing from continuous variable non-Gaussian states is possible using linear optics and conditional homodyne…”
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Quantum reconstruction of an intense polarization squeezed optical state by Marquardt, Ch, Heersink, J, Dong, R, Chekhova, M V, Klimov, A B, Sánchez-Soto, L L, Andersen, U L, Leuchs, G

“…We perform a reconstruction of the polarization sector of the density matrix of an intense polarization squeezed beam starting from a complete set of Stokes…”
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Tools for detecting entanglement between different degrees of freedom in quadrature squeezed cylindrically polarized modes by Gabriel, C., Aiello, A., Berg-Johansen, S., Marquardt, Ch, Leuchs, G.

“…Quadrature squeezed cylindrically polarized modes contain entanglement not only in the polarization and spatial electric field variables but also between these…”
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After-gate attack on a quantum cryptosystem by Wiechers, C, Lydersen, L, Wittmann, C, Elser, D, Skaar, J, Marquardt, Ch, Makarov, V, Leuchs, G

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Entangling different degrees of freedom by quadrature squeezing cylindrically polarized modes by Gabriel, C, Aiello, A, Zhong, W, Euser, T G, Joly, N Y, Banzer, P, Förtsch, M, Elser, D, Andersen, U L, Marquardt, Ch, Russell, P St J, Leuchs, G

“…Quantum systems such as, for example, photons, atoms, or Bose-Einstein condensates, prepared in complex states where entanglement between distinct degrees of…”
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Evading Vacuum Noise: Wigner Projections or Husimi Samples? by Müller, C R, Peuntinger, C, Dirmeier, T, Khan, I, Vogl, U, Marquardt, Ch, Leuchs, G, Sánchez-Soto, L L, Teo, Y S, Hradil, Z, Řeháček, J

“…The accuracy in determining the quantum state of a system depends on the type of measurement performed. Homodyne and heterodyne detection are the two main…”
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Quantum polarization tomography of bright squeezed light by Müller, C R, Stoklasa, B, Peuntinger, C, Gabriel, C, ehá ek, J, Hradil, Z, Klimov, A B, Leuchs, G, Marquardt, Ch, Sánchez-Soto, L L

“…We reconstruct the polarization sector of a bright polarization squeezed beam starting from a complete set of Stokes measurements. Given the symmetry that…”
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Frequency tuning of single photons from a whispering-gallery mode resonator to MHz-wide transitions by Schunk, G., Vogl, U., Sedlmeir, F., Strekalov, D. V., Otterpohl, A., Averchenko, V., Schwefel, H. G. L., Leuchs, G., Marquardt, Ch

“…Quantum repeaters rely on interfacing flying qubits with quantum memories. The most common implementations include a narrowband single photon matched in…”
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Assessing the polarization of a quantum field from stokes fluctuations by Klimov, A B, Björk, G, Söderholm, J, Madsen, L S, Lassen, M, Andersen, U L, Heersink, J, Dong, R, Marquardt, Ch, Leuchs, G, Sánchez-Soto, L L

“…We propose an operational degree of polarization in terms of the variance of the Stokes vector minimized over all the directions of the Poincaré sphere. We…”
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Quantum hacking of continuous-variable quantum key distribution systems: Realtime Trojan-horse attacks by Stiller, B., Khan, I., Jain, N., Jouguet, P., Kunz-Jacques, S., Diamanti, E., Marquardt, C., Leuchs, G.

“…We experimentally demonstrate successful Trojan-horse attacks on laboratory and commercial continuous-variable quantum key distribution systems with binary and…”
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Unfolding the Hong-Ou-Mandel interference between heralded photons from narrowband twin beams by Laiho, K, Dirmeier, T, Shafiee, G, Marquardt, Ch

“…New J. Phys. 25, 083008 (2023) The Hong-Ou-Mandel (HOM) interference is one of the most intriguing quantum optical phenomena and crucial in performing quantum…”
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