Controlling the Effective Hamiltonian of a Driven Quantum Superconducting Circuit - Venkatraman, Jayameenakshi
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The thesis illustrates, with a remarkable combination of theoretical analysis and experimental investigation, how the static Hamiltonian of an oscillator with both 3rd and 4th order non-linearity can morph into a profoundly different Hamiltonian under the influence of an oscillating driving force. In a classical system, such transformation would not be considered a novelty, but the author demonstrates that the new Hamiltonian can possess an exotic symmetry with surprising new quantum properties that one would never anticipate from the original Hamiltonian, with no classical equivalent. The…mehr

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Produktbeschreibung
The thesis illustrates, with a remarkable combination of theoretical analysis and experimental investigation, how the static Hamiltonian of an oscillator with both 3rd and 4th order non-linearity can morph into a profoundly different Hamiltonian under the influence of an oscillating driving force. In a classical system, such transformation would not be considered a novelty, but the author demonstrates that the new Hamiltonian can possess an exotic symmetry with surprising new quantum properties that one would never anticipate from the original Hamiltonian, with no classical equivalent. The root cause of these unexpected properties is a subtle interference effect, which is only possible in a quantum context. Carefully crafted control experiments ensure that measured data are compared with theoretical predictions with no adjustable parameters. Instrumental in this comparison is a new diagrammatic theory developed by the author.
Autorenporträt
Jaya, originally from Bengaluru, India, earned her Bachelor's degree in Physics from IIT Kanpur in 2016. Her introduction to quantum optics came during her undergraduate research on fast resonator reset with Alexandre Blais at Université de Sherbrooke. In 2023, she completed her Ph.D. under Michel Devoret at Yale University, where she developed experimental and theoretical tools to control superconducting circuits subjected to microwave drives for bosonic codes and continuous-variable quantum computation. In Fall 2024, she began a postdoctoral position at UCSB with Ania, focusing on enhancing quantum control of solid-state spins for quantum sensing of condensed matter systems. Outside of Physics, Jaya enjoys running, meditating, and exploring nature. She is also trained in Carnatic music and Bharatanatyam and delights in dabbling with these art forms.