Conducting a research program including developing novel algorithms, developing and testing code, applying new codes to optimize the dynamics of quantum systems and conducting scientific meetings and
Abstract
Coherent excitation of a qubit, represented by an elementary two-level system, is a fundamental step for the control of quantum information and quantum computation processes. In general, quantum systems have complex structures that redound in detrimental effects on the control of the qubit, hence the need to protect the qubit and use weak (and long) laser pulses. In particular, using stronger pulses the population can lead from the qubit to other levels or induce high-field modulation that depend on the energy splittings between the sublevels in the Hamiltonian. In a very recent publication we have shown however, that at Rabi frequencies much larger than the energy splittings, the dynamics can mimic that of a two-level system where at final time the population oscillates between the initial and target (resonantly chosen) state depending on the energy splitting, rather than the pulse amplitude. These effective Rabi oscillations where called AROs, from anomalous Rabi oscillations. The AROs are quite generic and should be observable in many different systems. They limit the maximum frequency at which the population can oscillate, in a way conveying more robustness to the state-preparation of the qubit. However, the AROs have not yet been observed experimentally and have not been used for practical purposes. In this project we plan to: 1. Study different systems to evaluate the feasibility of observing AROs experimentally under realistic conditions. 2. Search for systems where the effects of AROs are maximal at the lowest possible pulse intensities 3. Search for AROs in systems that have potential utility in Quantum Information/Quantum Computing processes, like those modeled by Jaynes-Cummings models 4. Explore situations where AROs might be useful in QI/QC processes, which typically imply processes that require several sequential Raby cycles 5. Use quantum optimal control theory or analytical tools to optimize the pulse shape or pulse chirping such as to minimize the non-adiabatic couplings that limit the range of parameters where AROs can be observed. In particular, in AROs the non-adiabatic couplings occur at larger pulse amplitudes and hence needs more refined techniques of optimization. 6. Exploit the AROs as a spectroscopic tool that allows to obtain information regarding the energy splitting in the system analyzing the deviations from the normal Rabi oscillation behavior. 7.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Oct 22, 2018
- Source ID
- W911NF1810256
Entities
People
- Bo Young Chang
Organizations
- Army Contracting Command
- Seoul National University
- United States Army