Towards achieving strong coupling in three-dimensional-cavity with solid state spin resonance

Journal Article · Thu Apr 21 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4946893· OSTI ID:22594615

Delhote, N.; Aubourg, M.; Madrangeas, V.; Cros, D. ^[1]; Castelletto, S. ^[2]; Tobar, M. E. ^[3]

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1. XLIM, UMR CNRS 7252, Université de Limoges, 123 av. A. Thomas, 87060 Limoges Cedex (France)
2. School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Melbourne (Australia)
3. School of Physics, The University of Western Australia, Crawley, Western Australia 6009 (Australia)

We investigate the microwave magnetic field confinement in several microwave three-dimensional (3D)-cavities, using a 3D finite-element analysis to determine the best design and achieve a strong coupling between microwave resonant cavity photons and solid state spins. Specifically, we design cavities for achieving strong coupling of electromagnetic modes with an ensemble of nitrogen vacancy (NV) defects in diamond. We report here a novel and practical cavity design with a magnetic filling factor of up to 4 times (2 times higher collective coupling) than previously achieved using one-dimensional superconducting cavities with a small mode volume. In addition, we show that by using a double-split resonator cavity, it is possible to achieve up to 200 times better cooperative factor than the currently demonstrated with NV in diamond. These designs open up further opportunities for studying strong and ultra-strong coupling effects on spins in solids using alternative systems with a wider range of design parameters. The strong coupling of paramagnetic spin defects with a photonic cavity is used in quantum computer architecture, to interface electrons spins with photons, facilitating their read-out and processing of quantum information. To achieve this, the combination of collective coupling of spins and cavity mode is more feasible and offers a promising method. This is a relevant milestone to develop advanced quantum technology and to test fundamental physics principles.

• OSTI ID: 22594615
• Journal Information: Journal of Applied Physics, Vol. 119, Issue 15; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DIAMONDS
ELECTRONS
FINITE ELEMENT METHOD
MAGNETIC FIELDS
MICROWAVE RADIATION
NITROGEN
ONE-DIMENSIONAL CALCULATIONS
PARAMAGNETISM
PHOTONS
QUANTUM COMPUTERS
QUANTUM INFORMATION
READOUT SYSTEMS
RESONANCE
SOLIDS
SPIN
STRONG-COUPLING MODEL
SUPERCONDUCTING CAVITY RESONATORS
THREE-DIMENSIONAL CALCULATIONS
VACANCIES