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 112 for “"quantum state"”.
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Quantum State Discrimination with Overcompleteness
… for binary hypothesis testing in classical and quantum settings and overcomplete quantum measurements for quantum binary state discrimination. With this we explore decision and measurement operating characteristics defined as the tradeoff between probability of detection and probability of false …
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The Case for Quantum State Realism
I argue for a realist interpretation of the quantum state. I begin by reviewing and critically evaluating two arguments for an antirealist interpretation of the quantum state, the first derived from the so-called ‘measurement problem’, and the second from the concept of local causality. I argue …
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Locally Adaptive Protocols for Quantum State Discrimination
… contributions to two rapidly developing fields: quantum information theory and machine learning. It has recently been demonstrated that reinforcement learning is an effective tool for a wide variety of tasks in quantum information theory, ranging from quantum error correction to quantum control …
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Quantum State Singlet-Triplet Character Control in 7Li2
We have demonstrated a means of quantum control by all-optical control of valence electron spin polarization in the lithium dimer. The energy levels of interest are two closely spaced rovibrational levels (the G1Πg (12, 21f) and 13Sg- (1, 21f) states separated by 720 MHz). In the absence of any …
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Quantum state discrimination with bosonic channels and Gaussian states
Discriminating between quantum states is an indispensable part of quantum information theory. This thesis investigates state discrimination of continuous quantum variables, focusing on bosonic communication channels and Gaussian states. The specific state discrimination problems studied are (a) …
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Quantum state reconstruction and tomography using phase-sensitive light detection
… setup that is capable of performing coherent state tomography. We fully characterize it in order to verify whether or not it will be capable to perform non-demolition homodyne detection of squeezed light in a high-finesse cavity QED setup with an ensemble of Cesium atoms coupled to the cavity. …
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Fast, Nondestructive Quantum-state Readout of a Single, Trapped, Neutral Atom
… experiments in a range of disciplines such as quantum information science, quantum simulation and fundamental light-atom interaction. In this thesis, I build such a system and use it to trap and study a single, neutral atom of 87Rb. I confront and overcome several experimental challenges while …
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Quantum State Estimation and Tracking for Superconducting Processors Using Machine Learning
<p>Quantum technology has been rapidly growing; in particular, the experiments that have been performed with superconducting qubits and circuit QED have allowed us to explore the light-matter interaction at its most fundamental level. The study of coherent dynamics between two-level systems and …
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Molecular vibrational diagnostics - from quantum state stability to real time histopathology
… to create a stable set of non-statistical quantum states that grows with molecular size. We derive a scaling relation for the number of non-statistical states as a function of molecular size. In accordance with the scaling model, we see highly regular vibrational progressions persisting …
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Algorithmic Quantum-State Generation for Simulating Quantum Field Theories on a Quantum Computer
Simulating a quantum field theory (QFT) on a quantum computer comprises three steps: generating an initial state, simulating time evolution and measuring observables, with the initial-state generation being the most expensive step for the entire simulation. In this thesis, we introduce a general …
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Quantum state-resolved studies of sticking and elastic scattering of H₂ from Cu(100)
… sticking coefficients. For the ground vibrational state, the H2 sticking coefficient is 1.2±0.4×10−4 at Ei = 74 meV and ≤ 2.5±0.6×10−4 at Ei = 189 meV. For the first excited vibrational state, the upper limit of the H2 sticking coefficient is 0.065 at Ei = 74 meV and 0.17 at Ei = 189 meV. The kinetic …
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The status of casuality and determinism in a philosophical interpretation of quantum state description
Thesis (M.A.)--Boston University
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Bounding the Quantum and Classical Resources in Bell Experiments
Bell's theory of nonlocality in quantum mechanics allows for interesting correlations between separated parties. In this scenario, both parties share a quantum state and measure it to obtain a classical value. Through entanglement, the results of the measurement from one party can affect the …
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Classical Commitments to Quantum States
We define the notion of a classical commitment to quantum state scheme, which allows a quantum prover to compute a classical commitment to a quantum state and later open each qubit of the state in either the standard or Hadamard basis, while limiting communication with the verifier to a classical …
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Sampling Using Controlled Quantum Walks
We give a new quantum algorithm to sample from probability distributions over graph vertices quadratically faster than the optimal classical algorithm, which uses random walks with stopping rules. Efficient sampling is an important computational task used in simulations based on stochastic …
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Polarization Sensitive Imaging Techniques Using Quantum Entangled Qubits
… research is to study imaging techniques using quantum entangled qubits. These techniques extract information about the quantum state of two entangled qubits and corelate the degree of entanglement to each pixel. Imaging information of the underlying structure or material is decoded using the …
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A Groundwork for Perspectival Quantum Mechanics
… recently been a renewed focus on ‘perspectival’ quantum theories. which simultaneously maintain the existence of single measurement outcomes and the universality of unitary evolution. At the same time, these theories have come under attack with results by Frauchiger and Renner, Baumann and Wolf, …
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Quantum money and scalable 21-cm cosmology
… topics. The first part of my thesis is about quantum money, a cryptographic protocol in which a mint can generate a quantum state that no one can copy. In public-key quantum money, anyone can verify that a given quantum state came from the mint, and in collision-free quantum money, even the …
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Learning with classical and quantum information constraints
… randomness governed by the laws of physics in quantum computers. First, we study distribution learning and testing with local information constraints such as local differential privacy (LDP) and communication constraints. We derive a general lower-bound framework for interactive communication …
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