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Articles 1 - 4 of 4
Full-Text Articles in Physics
Partial Measurements Of Quantum Systems, Jonathan Tyler Monroe
Partial Measurements Of Quantum Systems, Jonathan Tyler Monroe
Arts & Sciences Electronic Theses and Dissertations
Projective measurement is a commonly used assumption in quantum mechanics. However, advances in quantum measurement techniques allow for partial measurements, which accurately estimate state information while keeping the wavefunction intact. We employ partial measurements to study two phenomena. First, we investigate an uncertainty relation—in the style of Heisenberg’s 1929 thought experiment—which includes partial measurements in addition to projective measurements. We find that a weak partial measurement can decrease the uncertainty between two incompatible (non-commuting) observables. In the second study, we investigate the foundation of irreversible dynamics resulting from partial measurements. We do so by comparing the forward and time-reversed probabilities …
Measurement, Dissipation, And Quantum Control With Superconducting Circuits, Patrick Harrington
Measurement, Dissipation, And Quantum Control With Superconducting Circuits, Patrick Harrington
Arts & Sciences Electronic Theses and Dissertations
The interaction between a superconducting circuit and its environment can cause decoherence. However, interactions with an environment are necessary for quantum state preparation and measurement. Through the dynamics of open quantum systems, the environment is a resource to control and readout superconducting circuit states. I present an experimental result demonstrating qubit state stabilization from engineered dissipation with a microwave photonic crystal. In addition, I discuss the statistical arrow of time in the dynamics of continuous quantum measurement. These results demonstrate an interplay between open quantum system dynamics and statistics, which highlights the role of both dissipation and measurement for quantum …
Exploring Quantum Dynamics And Thermodynamics In Superconducting Qubits, Mahdi Naghiloo
Exploring Quantum Dynamics And Thermodynamics In Superconducting Qubits, Mahdi Naghiloo
Arts & Sciences Electronic Theses and Dissertations
Quantum technology has been rapidly growing due to its potential revolutionary applications. In particular, superconducting qubits provide a strong light-matter interaction as required for quantum computation and in principle can be scaled up to a high level of complexity. However, obtaining the full benet of quantum mechanics in superconducting circuits requires a deep understanding of quantum physics in such systems in all aspects. One of the most crucial aspects is the concept of measurement and the dynamics of the quantum systems under the measurement process. This thesis is intended to be a pedagogical introduction to the concept of quantum measurement …
Topics In Pt-Symmetric Quantum Mechanics And Classical Systems, Nima Hassanpour
Topics In Pt-Symmetric Quantum Mechanics And Classical Systems, Nima Hassanpour
Arts & Sciences Electronic Theses and Dissertations
Space-time reflection symmetry, or PT symmetry, first proposed in quantum mechanics by Bender and Boettcher in 1998 [2], has become an active research area in fundamental physics. This dissertation contains several research problems which are more or less related to this field of study. After an introduction on complementary topics for the main projects in Chap.1, we discuss about an idea which is originated from the remarkable paper by Chandrasekar et al in Chap.2. They showed that the (second-order constant-coefficient) classical equation of motion for a damped harmonic oscillator can be derived from a Hamiltonian having one degree of freedom. …