Nummerical Optimization of Control of Multiple Carbon Qubits near a Nitrogen-Vacancy Center
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2017-01-01 |
| Journal | Research Repository (Delft University of Technology) |
| Authors | Tim Dikland |
Abstract
Section titled āAbstractāThe NV-center in diamond is a promising system for quantum information processing. The typical qubits are the electron spin in the NV-center and the surrounding 13C nuclear spins. Fast and precise control of many 13C spins is desirable but challenging due to crosstalk. Crosstalk is the unwanted eļ¬ect of a control pulse on the other qubits. The coupled NV-13C system is explored, and numerical techniques to optimize the control of multiple and single qubits are used. In this report the eļ¬ect of the Bloch-Siegert shift in the weak driving regime is investigated ļ¬rst. This is done by studying the eļ¬ect of a Ļ-pulse when two carbon qubits are driven at the same time on resonance. It turns out that in this weak driving regime the eļ¬ect of the oļ¬ resonance is very small, and changes the ļ¬delity not more than 0.3%. Furthermore the eļ¬ect of a square Ļpulse on 4 nearby qubits is studied. If the pulse is not optimized (thus square), the pulse cannot be done in less than 100Āµs while retaining at least 99% ļ¬delity. By optimizing the envelope of the driving ļ¬eld using constrained optimization the pulse can be done in 22Āµs while retaining at least 99% ļ¬delity.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal Sourceā- DOI: None