INTERFACING MINIATURIZED SUPERCONDUCTING RESONATORS TO ULTRA-COHERENT SPIN ENSEMBLES FOR HIGHER EFFICIENCY
Abstract
The hybridization between the quantum excitations in the electromagnetic field with those in solid-state matter can unify diverse quantum technologies for networking and computation. Toward this important challenge, the strong coupling and storage of single photons between a superconducting (SC) resonator and a spin ensemble have been demonstrated; however, the retrieval efficiency of this quantum memory was severely restricted by the inhomogeneous broadening of the large spin ensembles used (N approximately 1012 spins). In this proposal, a team possessing expertise in SC quantum circuits and solid-state spins aims to achieve strong coupling to a smaller ensemble of N approximately 108 spins by fabricating a SC lumped-element resonator with miniaturized mode volume directly on diamond. Our approach is enabled by recent advances in the chemical vapor deposition growth (CVD) of diamonds with high density ensembles of nitrogen-vacancy (NV) centers that possess near-optimized coherence, exceeding 300 microseconds at 3.5 K. Concurrently, we will introduce cryogenic widefield imaging using NV magnetometry for the microwave magnetic fields inside SC resonators. This novel quantum sensing perspective promises to illuminate fundamental material science aspects, such as twolevel systems, quasiparticles, and vortices, that impact the dissipation (quality factor) in SC resonators, a key metric for not only the strong coupling condition, but also for the coherence time of SC qubits and the sensitivity of single photon detectors.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Nov 17, 2022
- Source ID
- FA23862114095
Entities
People
- Brian B Zhou
Organizations
- Air Force Office of Scientific Research
- Boston College
- United States Air Force