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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 20 of 27 for “"SQUEEZED STATES"”.
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Squeezed states and quantum nondemolition measurements
… properties of special minimum uncertainty states of the electromagnetic field: the “squeezed states”. These are states with reduced quantum fluctuations in certain observables (the quadrature phase amplitudes). In chapter two it is shown that the one mode and two mode squeezed states are …
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Squeezed states for advanced gravitational wave detectors
… detectors among them. Introducing squeezed states into an interferometer's readout port can improve the sensitivity of the instrument, leading to richer astrophysical observations. In recent years, this technique has been used to improve the sensitivity of the GEO600 [1011 and the …
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Quantum reality and squeezed states of light
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Quantum noise reduction using squeezed states in LIGO
… fluctuations entering the interferometer with squeezed states, which have lower noise in one quadrature than the vacuum state, we have reduced the shot noise of a LIGO interferometer. The sensitivity to gravitational waves measured during this experiment represents the best sensitivity achieved …
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ΘΕΩΡΙΑ ΤΩΝ ΠΕΠΙΕΣΜΕΝΩΝ (SQUEEZED) ΚΑΤΑΣΤΑΣΕΩΝ ΚΑΙ ΕΦΑΡΜΟΓΕΣ ΣΤΗΝ ΚΒΑΝΤΙΚΗ ΟΠΤΙΚΗ
… THE MATHEMATICAL POINT OF VIEW, THE THEORY OF STATES THAT HAVE SQUEEZED NOISE IN THE ONE QUADRATURE COMPONENT AND CORRESPONDINGLY INCREASED IN THE OTHER (SQUEEZED STATES). IN THE PRESENT STUDY WE DEVELOPED FURTHER THE YUEN THEORY STUDYING THE SQUEEZED STATES IN THE Q-REPRESENTATION. ALSO WE …
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Expanding the Reach of Quantum Enhanced Gravitational-Wave Detectors
… sensitivity. The introduction of non-classical squeezed states to reduce quantum shot noise during the third gravitational wave observing run O3 ushered in the era of quantum-enhanced gravitational wave interferometry. This was, however, accompanied by an increase in measurement back-action, in …
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Exploring spin physics with ultracold atoms
… how we prepared and observed phantom helix states: eigenstates of the XXZ Hamiltonian. Our understanding of the contact interactions and the phantom helix states enabled us to observe long-predicted lattice-induced resonances, whose effects can be leveraged as another knob to tune the XXZ …
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Generation and application of squeezed light
… some aspects of future applications of squeezed states. Subsequent to an introductory part summarizing a few basic notions and facts related to squeezing, a detailed study of the generation of squeezed light and its effects in two different quantum optical systems is presented. Firstly a …
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Development of techniques for quantum-enhanced laser-interferometric gravitational-wave detectors
… quantum noise in GW detectors, the theory of squeezed states including generation, degradation, detection, and control of squeezed states using sub-threshold optical parametric oscillators (OPOs) and homodyne detectors, experimental characterization of these techniques (using periodically …
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Applications of long storage time optical cavities
… any loss can easily degrade the fragile quantum states. One such example is a quantum noise filter cavity for gravitational wave (GW) detectors, where an optical cavity is necessary for producing frequency-dependent squeezed states of light to improve the sensitivity over their broad audioband …
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Signatures of non-classicality in optomechanical systems
… order of 10^15 atoms) into highly non-classical states. In particular we have shown new methods for preparing optomechani-cal pure states, squeezed states and entangled states. At the same time, proce-dures for experimentally detecting these quantum effects have been proposed. In particular, a …
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Theoretical Limits of Quantum Ranging
… advantage provided by single-beam displaced squeezed states in active ranging. Analytical expressions of the quantum Fisher information (QFI) are provided for monochromatic and continuous-mode waves passing through a thermal loss channel with arbitrary loss and noise conditions. The optimal …
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Broadband Squeezed Microwaves and Amplification with a Josephson Traveling-Wave Parametric Amplifier
Squeezed light enables precision measurement beyond the standard quantum limit imposed by the Heisenberg uncertainty principle. It has been widely adopted in research fields to achieve scientific breakthroughs from gravitational wave detection to biological microscopy enhancement. The generation of …
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Conditional Mechanical Squeezing of a Micromechanical Oscillator Approaching the Quantum Regime
… interaction being used to prepare pondermotively squeezed states of light, optical-optical entanglement, motional ground states, and more. In this thesis, I will introduce and demonstrate a conditionally-prepared motional squeezed state of a micromechanical oscillator approaching the quantum …
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Developing and Characterizing Sources of Quantum States of Light: from Single Photons to Million-Photon Fock States
… optics is the generation and control of quantum states of light. Chief among these states are Fock states, the fundamental eigenstates of the electromagnetic Hamiltonian with a perfectly-defined photon number. Decades of research have been devoted to producing Fock states, but no known source can …
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Broadband single and multimode quantum light generation using optical nonlinearities
… is significant interest in generating quantum states of light that can be harnessed for applications in the classical world we are most familiar with. However, maintaining "quantumness'' as the number of photons grows large has proved challenging due to the detrimental effects of loss. In this …
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Quantum Optics and Mechanics in Gravitational-Wave Detectors
… detection, wherein the injection of squeezed states has been demonstrated as an effective technique to suppress high-frequency vacuum fluctuations. As gravitational-wave detectors continue to improve, operating at higher powers with more squeezing and reduced classical noises, …
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Unified treatment of light-induced effects for atomic ensemble in optical cavities
… The standard method is by generating a spin squeezed state to minimize the variance along a particular axis of interest. We perform experiments to show that by loading N0 = 800 atoms into the optical cavity, we can reduce the quantum projection noise by 10dB below SQL while keeping the state …
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Quantum noise and radiation pressure effects in high power optical interferometers
… injection and generation of non-classical (squeezed) states of light, and cooling and trapping of macroscopic mirror degrees of freedom by manipulation of the optomechanical coupling between radiation pressure and mirror motion. A computational tool is developed to model complex …
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Periodic driving and nonreciprocity in cavity optomechanics
… used to prepare mechanical resonators in quantum squeezed states, we nd and study the general solution in the rotating-wave approximation. In the following chapter, we show that our technique reveals an exact analytical solution of the explicitly time-periodic quantum Langevin equation describing …
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