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 13 of 13 for “"Quantum state tomography"”.
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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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Characterizing and measuring properties of continuous-variable quantum states
We investigate properties of quantum mechanical systems in the light of quantum information theory. We put an emphasize on systems with infinite-dimensional Hilbert spaces, so-called continuous-variable systems'', which are needed to describe quantum optics beyond the single photon regime and other …
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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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Multidimensional fiber quantum light sources and their applications
… potential for applications in high-dimensional quantum information processing. When paired with other degrees of freedom such as spectral modes, fibers become a versatile platform for studying multidimensional quantum systems. In this thesis, we present our recent progress in fundamental studies …
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Dynamics of quantum many-body systems with long-range interactions
… them one of the most promising candidates for quantum simulation and quantum computation in the near future, and open new opportunities for study many-body physics. Out-of-equilibrium properties of such complex systems present truly fascinating and rich physics, which is yet to be fully …
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Initialisation, control and readout of a nuclear-magnon quantum register
Semiconductor quantum dots (QDs) have inherited the long-standing trope: ‘artificial atoms’ . On one hand this does great justice to their exquisite light-matter interface, allowing the investigation of fundamental, solid-state quantum optics. On the other hand, it downplays the true complexity of …
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Accelerating Learning of Quantum Systems using Prior Information
Towards realizing practically useful quantum devices, the sizes of quantum devices are being scaled up. An imminent challenge to scalability is ensuring resource requirements of learning tasks that occur as part of device characterization and execution of quantum algorithms also scale favorably. …
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New Theory and Algorithms for Convex Optimization with Non-Standard Structures
… applications, including positron emission tomography, D-optimal design, quantum state tomography, and Nesterov’s relaxation of boolean quadratic optimization. We show, via the machinery of Euclidean Jordan algebra, that this generalized MG method converges with rate 𝑂(ln(𝑛)/𝑘), where 𝑛 …
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Investigating Topological Quantum Matter: Machine Learning Topological Phases, Topological Quantum Codes, Interplay of Disorder and Topology via Transport Phenomena and Phase Transitions
Future quantum technologies must meet three inter-locking demands: (i) faithful yet compact representations of strongly–entangled quantum matter, (ii) scalable error-mitigation protocols that tame spatially correlated noise, and (iii) near-term algorithms that coax useful optimisation and learning …
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Entanglement detection with minimal tomography using witness bases measurement
… the experiment performed on detection of quantum entanglement with minimal tomography, using witness-family measurements. This is achieved by measuring bases of witness operators, which collectively provide complete information for state reconstruction.
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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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Towards optical quantum communication in space
"To build a global quantum communication network, low-transmission, fiber-based communication channels can be supplemented by using a free-space channel between a satellite and a ground station on Earth. To this end, we have developed a system that generates hyperentangled photonic ""ququarts'' and …