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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Photonic structures for QIP in diamond

Kai‐Mei C. Fu, Charles Santori, Paul E. Barclay, Neal Meyer, A. M. Holm, Igor Aharonovich, Steven Prawer, Raymond G. Beausoleil

Published Dec 29, 2008• 0 citations
Publisher

Abstract

We observe the coupling of nitrogen-vacancy centers in single-crystal diamond to GaP waveguides on the diamond surface. We describe the fabrication procedure and characterize the waveguide performance. Our results indicate that the GaP/diamond hybrid system is a promising system for coupling nitrogen-vacancies to optical microstructures for quantum information processing and sensing applications.

DOI
10.1117/12.813788

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We observe the coupling of nitrogen-vacancy centers in single-crystal diamond to GaP waveguides on the diamond surface. We describe the fabrication procedure and characterize the waveguide performance. Our results indicate that the GaP/diamond hybrid system is a promising system for coupling nitrogen-vacancies to optical microstructures for quantum information processing and sensing applications.
Nitrogen–vacancy centers in diamond have outstanding quantum optical properties that enable applications in information processing and sensing. As with most solid-state systems for quantum photonic applications, the great promise lies in the capability to embed them in an on-chip optical network. Here we present basic integrated devices composed of diamond micro-ring resonators coupled to waveguides that are terminated with grating out-couplers. Strong enhancement is observed for the zero-phonon line of nitrogen–vacancy centers coupled to the ring resonance. The zero-phonon line is efficiently coupled from the ring into the waveguide and then scattered out of plane by the grating out-couplers.
Direct integration of single photon emitters into easy-to-fabricate functional microstructures is a major step towards a future quantum optical technology. Because of its photostability and versatile spin properties the nitrogen vacancy center (NV center) in diamond is one of the most promising candidates as source of single photons [1]. One of its drawbacks lies in the properties of its host crystal. Diamond is hard to process and therefore it is difficult to manufacture complex integrated structures in a reliable way. One way to avoid these difficulties is to use nanodiamonds in a so called hybrid approach [2]. Hybrid systems comprise different constituents from different materials. By exploiting the individual advantages of the individual elements it is possible to build systems with properties exceeding the properties of the individual subsystems.
Point defects in diamond, particularly nitrogen-vacancy (NV) centers, have emerged as powerful tools for a broad range of quantum technologies. These defects are promising candidates for quantum information science, serving as deterministic single-photon sources and solid-state quantum memories. They have also been employed as nanoscale quantum sensors to detect various physical quantities, including magnetic fields, electric fields, and temperature, owing to their long spin coherence time at room temperature. Development of these diamond-based quantum technologies has been rapidly boosted by a recent quantum leap in nanofabrication technologies for high-quality single-crystal diamond. Incorporating these color centers into diamond nanostructures with mature integrated photonics provides a promising route to build scalable and practical systems for quantum applications. This review discusses recent progress and challenges in the hybrid integration of diamond color centers on cutting-edge photonic platforms. Nitrogen-vacancy centers in diamond have emerged as powerful tools for a broad range of quantum technologies. This review discusses recent progress and challenges in the hybrid integration of diamond color centers on cutting-edge photonic platforms.