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Advanced techniques for squeezed-light-enhanced gravitational-wave detection

Gniesmer, Jan (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2019)

Quantum noise is one of the limiting factors in laser-interferometric gravitational-wave (GW) detectors. The application of squeezed states in these interferometers allows the reduction of quantum noise in one quadrature. ...
Book of Abstracts for the European Quantum Technologies Conference (EQTC) 2023

Quantum Valley Lower Saxony (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2024-03-11)

The EQTC 2023 held from October 16th to October 20th, 2023, in Hannover, was a week of conference and exhibition. The conference featured over 40 exhibitors, more than two-dozen plenary presentations and panel discussions, ...
Creation of entangled atomic states by an analogue of the Dynamical Casimir effect

Lange, K.; Peise, J.; Luecke, B.; Gruber, T.; Sala, A.; Polls, A.; Ertmer, Wolfgang; Julia-Diaz, B.; Santos, L.; Klempt, C. (Bristol : Institute of Physics Publishing (IOP), 2018)

If the boundary conditions of the quantum vacuum are changed in time, quantum field theory predicts that real, observable particles can be created in the initially empty modes. Here, we realize this effect by changing the ...
Efficient quantum state tomography

Cramer, Marcus; Plenio, Martin B.; Flammia, Steven T.; Somma, Rolando; Gross, David; Bartlett, Stephen D.; Landon-Cardinal, Olivier; Poulin, David; Liu, Yi-Kai (London : Nature Publishing Group, 2010)

Quantum state tomography-deducing quantum states from measured data-is the gold standard for verification and benchmarking of quantum devices. It has been realized in systems with few components, but for larger systems it ...
Entangled momentum modes for atom interferometry

Anders, Fabian (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2022)

Entangled ensembles have been created in versatile atomic systems and find a promising application in entanglement-enhanced metrology. Here, entangled spin-states have been successfully applied within interferometers ...
Entanglement For Atom Interferometers

Idel, Alexander (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2021)

Quantum Sensors, like atom interferometers (AI), can be employed for high-precision measurements of inertial forces, including their application as gravimeters, gradiometers, accelerometers, and gyroscopes. Their ...
Entanglement in Ramsey interferometry, optical atomic clocks and trapped ions

Schulte, Marius (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2020)

This thesis describes new results on the entanglement of atomic spins in Ramsey interferometry, optical atomic clocks and trapped ions. It is divided into three parts: First, we investigate improvements to conventional ...
Experimental measurement-device-independent verification of quantum steering

Kocsis, Sacha; Hall, Michael J. W.; Bennet, Adam J.; Saunders, Dylan J.; Pryde, Geoff J. (London : Nature Publishing Group, 2015)

Bell non-locality between distant quantum systems-that is, joint correlations which violate a Bell inequality-can be verified without trusting the measurement devices used, nor those performing the measurements. This leads ...
Extended Coherence Time on the Clock Transition of Optically Trapped Rubidium

Kleine Buening, G.; Will, J.; Ertmer, Wolfgang; Rasel, Ernst Maria; Arlt, Jan J.; Klempt, Carsten; Ramirez-Martinez, F.; Piechon, F.; Rosenbusch, P. (College Park : American Physical Society, 2011)

Optically trapped ensembles are of crucial importance for frequency measurements and quantum memories but generally suffer from strong dephasing due to inhomogeneous density and light shifts. We demonstrate a drastic ...
Frequency up-conversion of nonclassical states of light

Baune, Christoph (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2016)

[no abstract]
Generalised versions of separable decompositions applicable to bipartite entangled quantum states

Anwar, Hussain; Jevtic, Sania; Rudolph, Oliver; Virmani, Shashank ([Bad Honnef] : Dt. Physikalische Ges., 2019)

The investigation of separable states in quantum theory has been driven by the notion that they are highly classical, in that they do not demonstrate nonlocality, and are in some contexts unable to support non-classical ...
Improvement of an Atomic Clock using Squeezed Vacuum

Kruse, I.; Lange, K.; Peise, J.; Lücke, Bernd; Pezze, L.; Arlt, Jan J.; Ertmer, Wolfgang; Lisdat, C.; Santos, Luis; Smerzi, A.; Klempt, Carsten (College Park : American Physical Society, 2016)

Since the pioneering work of Ramsey, atom interferometers are employed for precision metrology, in particular to measure time and to realize the second. In a classical interferometer, an ensemble of atoms is prepared in ...
Molecular binding in interacting quantum walks

Ahlbrecht, Andre; Alberti, Andrea; Meschede, Dieter; Scholz, Volkher B.; Werner, Albert H.; Werner, Reinhard F. (Bristol : IOP Publishing Ltd., 2012)

We show that the presence of an interaction in the quantum walk of two atoms leads to the formation of a stable compound, a molecular state. The wave function of the molecule decays exponentially in the relative position ...
Multi-particle entanglement in a spinor Bose-Einstein condensate for quantum-enhanced interferometry

Lücke, Bernd (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2014)

[no abstract]
New approaches in squeezed light generation : quantum states of light with GHz squeezing bandwidth and squeezed light generation via the cascaded Kerr effect

Ast, Stefan (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2015)

[no abstract]
Nichtklassische Zustände in ultrakalten Quantengasen

Klempt, Carsten (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2014)

[no abstract]
Non-classical state engineering for quantum networks

Vollmer, Christina E. (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2014)

[no abstract]
Non-classical states of matter in spinor Bose-Einstein condensates

Peise, Jan Christopher (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2015)

[no abstract]
Nonlinear Landau-Zener tunneling in quantum phase space

Trimborn, F.; Witthaut, D.; Kegel, V.; Korsch, H. J. (Bristol : IOP Publishing Ltd., 2010)

We present a detailed analysis of the Landau-Zener problem for an interacting Bose-Einstein condensate in a time-varying double-well trap, especially focusing on the relation between the full many-particle problem and the ...
On the enhancement of future gravitational wave laser interferometers and the prospects of probing macroscopic quantum mechanics

Rehbein, Henning (Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2009)

[no abstract]

Now showing items 1-20 of 29

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