SSQIP - Scalable Silicon-Based Quantum Information Processing
Abstract
The overall objective of the proposed research is to explore and develop spin qubit technologies in the Si/SiGe materials system. Silicon is a promising material system for quantum information processing due to a weak spin-orbit interaction and a small hyperfine interaction. At the same time, silicon presents severe materials challenges due to a large effective mass, valley degeneracy, and lack of high quality two-dimensional electron gases. Specific objectives of the proposed research include improving materials quality, scaling to larger system sizes without significantly increasing the number of gate electrodes, demonstrating qubit coupling to a cavity, and exploring and advancing quantum control techniques in quantum dots that approach the 1% threshold for quantum error correction with a surface code. Four research thrusts have been proposed to pursue and achieve the stated objectives. The first research thrust will explore silicon material processing and the factors limiting electron mobility. The team will work with Lawrence Semiconductor Research Laboratories (LSRL) to improve the growth of Si/SiGe quantum wells on 6 inch diameter relaxed buffer substrates. Materials processing steps limiting electron mobility will be investigated with the objective to increase the electron mobility to over a million. Limitations to valley splitting in these systems will be investigated through materials characterization. The second research thrust involves the development of a novel Òaccumulation onlyÓ gate architecture that consists of overlapping aluminum accumulation gates that are used to define and control the electronic confinement potential. The third research thrust will investigate a novel approach to spin qubit readout and qubit coupling. In this research thrust, Si/SiGe spin qubits will be coupled to a high quality factor microwave cavity. The electromagnetic field in the microwave cavity will be probed using microwave transmission measurements. High fidelity readout will be achieved using quantum limited Josephson parametric amplifiers. The fourth research effort will explore and implement quantum control improvements that will enable spin control with fidelities approaching the 1% error correction threshold.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 12, 2017
- Source ID
- W911NF1510149
Entities
People
- Jason R Petta
Organizations
- Army Contracting Command
- National Security Agency
- Princeton University