Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"vacuum fluctuations"”.
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Quantum noise reduction using squeezed states in LIGO
… further. This quantum noise originates from the vacuum fluctuations that enter the unused port of the interferometer and interfere with the laser light. Vacuum fluctuations have the minimum noise allowed by Heisenberg's uncertainty principle, [Delta]X1 [Delta]X2 >/=1, where the two quadratures X1 …
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The Runny Gauge Plasma: shear viscosity to entropy for quarks and gluons
… of most observables require quantum fluctuations to be taken into account. These arise in perturbation theory as loop corrections to tree level amplitudes, and describe both the scale-dependence of the coupling and charge screening in a many- body system. We emphasise that because the …
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Squeezing the Quantum Noise of LIGO below the Standard Quantum Limit
… sources is the quantum noise due to the quantum vacuum fluctuations of the light itself. Besides the light, the mirror also has quantum-mechanical features and experiences quantum back-actions when we probe it with light. Knowing the position of the mirror very well would inevitably perturb its …
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Aspects of Quantum Fluctuations under Time-dependent External Influences
The vacuum of quantum field theory is not empty space but filled with quantum vacuum fluctuations, which give rise to many intriguing effects. The first part of this Thesis addresses cosmic inflation, where the quantum fluctuations of the inflaton field freeze and get amplified in the expanding …
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Phonon-mediated Casimir effect
… phenomenon which emerges due to modification of vacuum fluctuations by boundaries in a confined area of space. It arises in many fields of physics, including condensed matter. Recently, substantial interest in the Casimir effect has revived as a result of the significant progress in the …
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Quantum Optics and Mechanics in Gravitational-Wave Detectors
… yet they remain at the whim of minute quantum fluctuations. Pushing our reach further into the cosmos demands a mastery over these quantum effects. In recent years, we have entered the era of quantum-enhanced gravitational-wave detection, wherein the injection of squeezed states has been …
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Squeezed states for advanced gravitational wave detectors
Quantum vacuum fluctuations impose strict limits on precision displacement measurements, those of interferometric gravitational-wave detectors among them. Introducing squeezed states into an interferometer's readout port can improve the sensitivity of the instrument, leading to richer astrophysical …
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Optical nonlinear effects and photon pair production in modulated materials
… an oscillation of boundary conditions in the vacuum can generate real photon pairs, which pop into existence from the zero-point energy. This surprising effect is known as the dynamical Casimir effect (DCE). In this thesis, we focus our attention on using the DCE as a route to experimentally …
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The origin of inflation.
… evaluate the path integral for metric fluctuations around both regular and singular instanton saddle points. The real-space Euclidean two-point correlator is analytically continued into the Lorentzian universe, where it describes the quantum mechanical vacuum fluctuations of the …
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Casimir-Polder interaction in second quantization
… surface, arising from the (quantum and thermal) fluctuations of the electromagnetic field, is a cornerstone of cavity quantum electrodynamics (cQED), and theoretically well established. Recently, Bose-Einstein condensates (BECs) of ultracold atoms have been used to test the predictions of cQED. …