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 20 of 80 for “"shot noise"”.
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Spin Shot Noise measurement
Charge shot noise, the intrinsic fluctuations in the electrical current resulting from the statistics of the arrival of discrete electronic charges, was predicted more than a century ago2 and has been an invaluable tool for examining the mechanism of charge transport and the nature of …
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Shot noise of atomic and molecular contacts
Diese Arbeit untersucht den ballistischen Elektronen-Transport in verschiedenen atomaren sowie molekularen Systemen unter der Verwendung der Rastertunnelmikroskopie und der Messung elektrischen Rauschens. Das Letztere wird genutzt, um Informationen über die Anzahl, die Transmission und die …
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Device Shot Noise and Saturation Effects on Oscillator Phase Noise
Oscillator phase noise is an important factor in designing radio frequency (RF) communications hardware. Phase noise directly contributes to adjacent-channel interference and an increase in bit error rate (BER). Understanding the operation of an oscillator can help with the oscillator design …
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Applications of correlated photon pairs : sub-shot noise interferometry and entanglement
… promise to demonstrate precision beyond the shot noise limit, although the current interference fringe visibility of [beta]= 0.84 ± 0.04 only translates to a shot noise limited phase uncertainty. Polarization-time entangled pairs can also be directly generated, by optically pumping the atoms …
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Noise in coulomb blockaded quantum dots and kondo systems
In this thesis we study the noise in Coulomb blockaded quantum dots in the vicinity of the peak of conductance in a full quantum treatment using the Keldysh technique. In previous work on this system, the emphasis have been on master equation approaches in the shot noise regime. In the vicinity of …
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A square root analog to digital converter to optimally convert photonic signals for computed tomography
… location is a Poisson process with an associated shot noise which rises with the square root of the number of photons received. An analog-to-digital converter (ADC) with a square root transfer function can quantize photonic signals with LSB size kept constant with respect to the photon shot noise. …
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Statistics In Diffractive Imaging
… 3D diffraction intensity from very many photon-shot-noise limited 2D measurements, when the particle orientation in each measurement is unknown. We coin such an imaging technique cryptotomography. In this chapter, we also study the noise limits beyond which cryptotomography is impossible. This …
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Thermodynamically valid noise models for nonlinear devices
Noise has been a concern from the very beginning of signal processing and electrical engineering in general, although it was perhaps of less interest until vacuum-tube amplifiers made it audible just after 1900. Rigorous noise models for linear resistors were developed in 1927 by Nyquist and …
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Expanding the Reach of Quantum Enhanced Gravitational-Wave Detectors
… at the cutting edge of quantum noise limited 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, …
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A theory of nonlinear systems
… a knowledge of the response of the system to shot noise excitation. Thus, shot noise occupies the same position as a probe for investigating nonlinear systems that the impulse occupies as a probe for investigating linear systems. The first section of this thesis is devoted to the Wiener theory …
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Noise and the full counting statistics of a Coulomb blockaded quantum dot
In this thesis, we consider the noise properties of a Coulomb blockaded quantum dot weakly coupled to two non interacting leads. We consider two approaches to calculating the density of states of the quantum dot, the first of which uses a functional integral approach which is difficult to extend to …
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Vector magnetometry using cavity-enhanced microwave readout of solid-state spin sensors
… directly, thereby overcoming the optical photon shot noise limitations of conventional fluorescence readout. Applying this technique to magnetometry, I first build a proof-of-concept magnetometer with the capability of measuring magnetic fields along a single vector axis, with a sensitivity …
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Processing of Simulated and Experimental Images of Closely Spaced Binary Stars Using Speckle Interferometry
… viewpoints. The atmospheric phase distortion and shot noise responsible for the observed speckle patterns are simulated. The deconvolution technique originally presented by Labeyrie is implemented to extract astrometric data from close visual binary stars. This method is applied to both simulated …
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Investigations of nonlocal transport and current noise in mesoscopic normal metal-superconductor hybrid structures
… we perform a series of experiments involving shot noise and nonlocal current correlation measurements in mesoscopic NSN devices. We extend the model of incoherent shot noise in diffusive normal metal-superconductor (NS) contacts and identify the magnitude of the local self-consistent gap in …
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Quantum noise reduction using squeezed states in LIGO
… new approaches to reducing the quantum noise will be needed to improve the sensitivity 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 …
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FCS for superconducting quantum point contacts
… nature of charge transfer. Particularly doubled shot noise due to Andreev reflections was explained and the behaviour of the Josephson current for long measurement times was calculated. The obtained results are also valuable for the understanding of transport through quantum dots with …
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Characterisation and assessment of a broadband tunable Ti:Sapphire laser for use in C.A.R.S. spectroscopy
… order to get the most efficient output. Runs of shots were recorded at various tuned wavelengths and energies. This allowed accurate comparisons with the models and assessment of the practicability of use of the laser as the Stokes beam in a CARS system. The shot-to-shot noise was also measured …
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CCD photometric precision for the Transiting Exoplanet Survey Satellite (TESS)
We seek to fully characterize all noise contributions along the CCD and electronics signal path specific to the equipment to be used on board the TESS all-sky space observatory. We adjust physical variables in such a way as to minimize this noise and achieve a photometric precision limited in large …
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On the Concepts of Resistance and Capacitance in Semiconductor Nanostructures
… system is investigated from the point of view of shot noise, finding, once again, a behavior analogous to the one of macroscopic devices connected in parallel.
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Optical detection development for the Hogan quantum holographic noise experiment
… Hogan recently proposed a "quantum holographic" noise that could potentially raise the expected noise floor for some current and upcoming high precision interferometers. Rainer Weiss et al. have designed an experiment searching for the noise in two coaligned Michelson interferometers. We have …
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