Theoretical Study Of Solid State Quantum Information Processing
Abstract
The major front of our research is on spin qubit decoherence, and we have mostly focused on decoherence of multiple qubits or non-equilibrium spin qubits. Specifically, we have completed our studies of two- and three-spin decoherence due to hyperfine interaction. We have investigated spin relaxation due to charge noise and/or spin valley mixing, and found that charge noise and spin-valley mixing could both be an important ingredient to spin relaxation at relatively low magnetic fields. We have studied decoherence of a driven qubit, and found that the electron relaxation and dephasing properties are strongly modified by the presence of driving. We have studied the scaling behavior of decoherence for a multiple-spin-qubit system under the influence of hyperfine interaction, and found that the multi-qubit decoherence properties are reasonably favorable. Lastly, we have investigated relaxation of a moving spin qubit, and found that phonon bottleneck effect reduces spin relaxation for larger magnetic fields, and fast motion can reduce spin relaxation for a wide range of magnetic fields. We have studied dynamics and relaxation of the spin of a tunneling electron, and found regimes where spin relaxation is minimized and spin hotspot is eliminated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 22, 2017
- Accession Number
- AD1067148
Entities
People
- Xuedong Hu
Organizations
- University at Buffalo