Realizing High Fidelity Gates in Protected Qubits and Multimode Quantum Processors
Abstract
Scientific Objectives: The primary aim of the proposed work is to develop high performance building blocks for a sealable superconduting quantum computer. We will develop ultra coherent quantum devices based on intrinsic topological protection and multimode 3D cavities, addressing both Options 1a and 1b of the Broad Agency Announcement on High performance Superconducting Qubits (W911NF-17-S-0008). We will demonstrate the first implementation of multiqubit zero pi devices, measure their coherence properties and gate fidelities, and improve two-qubit fidelities to exceed 99% by program end. Basic approaches: We will focus on error mitigation at the device level, using devices with disjoint support and topoligical protection to improve gate fidelities. We will demonstrate single qubit gates using Raman processes and plasmon assisted phase shifts, and will use a plasmon assisted ZZ gate to couple multiple qubits. We will explore the use of multimode cavities as an alternate architecture to efficiently use the long coherences provided by these new robust qubits. Methods to be employed: We will use well established methods that include fabrication and characterization of superconducting circuits and zero-pi devices in both a 2D and 3D circuit QED architecture, as well as microwave manipulation and homodyne/heterodyne spectroscopy and transmission measurements of circuit QED devices at dilution refrigerator termperatures. Calculational methods on the theory side will include analytical studies of simplified models, as well as full numerical diagonalization, solution of Landblad master equations and sampling of quantum trajectories for simulations based on realistic experimental parameters to explore new gate approaches.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 14, 2019
- Source ID
- W911NF1910016
Entities
People
- Andrew A. Houck
Organizations
- Army Contracting Command
- National Security Agency
- Princeton University