Abstract
Diamond photonics provides an attractive architecture to explore room temperature cavity quantum electrodynamics and to realize scalable multi-qubit computing. Here, we review the present state of diamond photonic technology. The design, fabrication and characterization of a novel nanobeam cavity produced in a single crystal diamond are demonstrated. The present cavity design, based on a triangular cross-section, allows vertical confinement and better signal collection efficiency than that of slab-based nanocavities and eliminates the need for a pre-existing membrane. The nanobeam is fabricated by focused-ion-beam (FIB) patterning. The cavity is characterized by confocal photoluminescence. The modes display quality factors of Q∼220 and deviate in wavelength by only ∼1.7 nm from the nitrogen-vacancy (NV−) color center zero phonon line (ZPL). The measured results are found to be in good agreement with three-dimensional finite-difference-time-domain (FDTD) calculations. A more advanced cavity design with Q=22 000 is modeled, showing the potential for high-Q implementations using the triangular geometry. The prospects of this concept and its application in spin non-demolition measurement and quantum computing are discussed.
Highlights
Quantum Information Technology (QIT) may revolutionize computing and communication by allowing solution of problems that nowadays computers are inefficient in, such as non-polynomial (NP) algorithms, secure communication, and modeling of many-body systems [1]
The negative nitrogen-vacancy color center (NV-) in a single crystal diamond is an attractive candidate for solid state QIT [2],[3]
The natural conclusion to be drawn from these early experiments is that the realization of interconnected high-Q cavities for QIT should be implemented on single crystal diamond, in the form of a 2D-slab photonic crystal, requiring the formation of a free-standing membrane
Summary
Quantum Information Technology (QIT) may revolutionize computing and communication by allowing solution of problems that nowadays computers are inefficient in, such as non-polynomial (NP) algorithms, secure communication, and modeling of many-body systems [1]. The natural conclusion to be drawn from these early experiments is that the realization of interconnected high-Q cavities for QIT should be implemented on single crystal diamond, in the form of a 2D-slab photonic crystal, requiring the formation of a free-standing membrane. The disappearance of the NV- can be explained by residual damage due to the ion implantation causing quenching of the color center [29].The optical degradation in the case of ultra-thin membranes is believed to be related to the ion-implantation technique utilized in the membrane formation process Until this technological obstacle is overcome, an alternative cavity design in a single crystal diamond, with potential for a high Q is required. The ways of reducing this Ga concentration are under study
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