Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:1510.05047 · Journal of the Optical Society of America B

Large-scale GaP-on-diamond integrated photonics platform for NV center-based quantum information

Michael Gould, Srivatsa Chakravarthi, Ian Christen, Nicole K. Thomas, Shabnam Dadgostar, Yuncheng Song, Minjoo Larry Lee, Fariba Hatami, Kai‐Mei C. Fu

Published Jan 13, 2016• 38 citations
arXivHTMLPDF

Abstract

We present chip-scale transmission measurements for three key components of a gallium-phosphide (GaP)-on-diamond integrated photonics platform: waveguide-coupled disk resonators, directional couplers, and grating couplers. We also present proof-of-principle measurements demonstrating nitrogen-vacancy (NV) center-emission coupled into selected devices. The demonstrated device performance, uniformity, and yield place the platform in a strong position to realize measurement-based quantum information protocols utilizing the NV center in diamond.

DOI
10.1364/josab.33.000b35

Related papers

Efficient Coupling of Single Nitrogen-Vacancy Center Photons to a GaP-on-Diamond Integrated Optics Platform

Michael Gould, Ian Christen, Srivatsa Chakravarthi +3 more

We present high single-photon collection rates into a bus waveguide from a nitrogen-vacancy center coupled to an integrated disk resonator. The resonator is built on a gallium phosphide (GaP)-on-diamond chip alongside passive photonic devices.

Conference on Lasers and Electro-Optics•Jan 1, 2016•0 citations

A scalable gallium-phosphide-on-diamond spin-photon interface

Nicholas S. Yama, Chun-Chi Wu, Fariba Hatami +1 more

The efficient interfacing of quantum emitters and photons is fundamental to quantum networking. Quantum defects embedded in integrated nanophotonic circuits are promising for such applications due to the deterministic light-matter interactions of high-cooperativity ($C>1$) cavity quantum electrodynamics and potential for scalable integration with active photonic processing. Silicon-vacancy (SiV) centers embedded in diamond nanophotonic cavities are a leading approach due to their excellent optical and spin coherence, however their long-term scalability is limited by the diamond itself, as its suspended geometry and weak nonlinearity necessitates coupling to a second processing chip. Here we realize the first high-cooperativity coupling of quantum defects to hybrid-integrated nanophotonics in a scalable, planar platform. We integrate more than 600 gallium phosphide (GaP) nanophotonic cavities on a diamond substrate with near-surface SiV centers. We examine a particular device with two strongly coupled SiV centers in detail, confirming above-unity cooperativity via multiple independent measurements. Application of an external magnetic field via a permanent magnet enables optical resolution of the SiV spin transitions from which we determine a spin-relaxation time $T_1>0.4$ ms at 4 K. We utilize the high cooperativity coupling to observe spin-dependent transmission switching and the quantum jumps of the SiV spin via single-shot readout. These results, coupled with GaP's strong nonlinear properties, establish GaP-on-diamond as a scalable planar platform for quantum network applications.

quant-pharXiv:2601.04733•Jan 9, 2026•0 citations

Quantum photonic devices in single-crystal diamond

Andrei Faraon, Charles Santori, Zhihong Huang +4 more

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.

New Journal of Physics•Feb 7, 2013•86 citations

Scalable on-chip integration of diamond color centers for cryogenic quantum photonics

H. Kurokawa, K. Sato, M. Kamata +16 more

Chip integration of quantum emitters is a crucial milestone for scalable quantum photonic information processing. Among optically active defect centers for quantum photonics, diamond color centers are promising because of their long spin coherence times and high photon emission rates. However, for a coherent-photon emission, they typically require a cryogenic environment to protect optical coherence from thermal phonons, which makes chip integration challenging. In this paper, we develop a chip-integrated diamond photonic crystal cavity embedding an ensemble of nitrogen-vacancy (NV) centers. We confirm cryogenic operation by observing Purcell enhancement of NV-center emission via an edge-coupled optical fiber. This result demonstrates successful integration of diamond color centers, a photonic crystal cavity, and an optical waveguide-fiber package, representing a key step toward scalable diamond-based quantum communication platforms.

quant-pharXiv:2604.06984•Apr 9, 2026•0 citations

Structures in diamond for optical manipulation of nitrogen-vacancy centers

Charles Santori, Kai‐Mei C. Fu, Paul E. Barclay +1 more

We describe research on new optical structures in diamond for quantum information and sensing applications based on the nitrogen-vacancy (NV) center. Results include etching experiments that reveal the vertical distribution of NV centers produced by ion implantation and annealing, and gallium phosphide waveguides fabricated on diamond with evanescent coupling to NV centers close to the diamond surface.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Dec 29, 2008•0 citations

Efficient extraction of zero-phonon-line photons from single nitrogen vacancy centers in an integrated GaP-on-diamond platform

Emma Schmidgall, Michael Gould, Shabnam Dadgostar +2 more

We demonstrate optical coupling of single NV center zero phonon emission to integrated GaP-on-diamond waveguides, with estimated total quantum efficiency values above 10% due to Purcell enhancement and efficient coupling between the cavities and waveguides.

Frontiers in Optics•Jan 1, 2016•5 citations
We present chip-scale transmission measurements for three key components of a gallium-phosphide (GaP)-on-diamond integrated photonics platform: waveguide-coupled disk resonators, directional couplers, and grating couplers. We also present proof-of-principle measurements demonstrating nitrogen-vacancy (NV) center-emission coupled into selected devices. The demonstrated device performance, uniformity, and yield place the platform in a strong position to realize measurement-based quantum information protocols utilizing the NV center in diamond.
The efficient interfacing of quantum emitters and photons is fundamental to quantum networking. Quantum defects embedded in integrated nanophotonic circuits are promising for such applications due to the deterministic light-matter interactions of high-cooperativity (C>1C>1C>1) cavity quantum electrodynamics and potential for scalable integration with active photonic processing. Silicon-vacancy (SiV) centers embedded in diamond nanophotonic cavities are a leading approach due to their excellent optical and spin coherence, however their long-term scalability is limited by the diamond itself, as its suspended geometry and weak nonlinearity necessitates coupling to a second processing chip. Here we realize the first high-cooperativity coupling of quantum defects to hybrid-integrated nanophotonics in a scalable, planar platform. We integrate more than 600 gallium phosphide (GaP) nanophotonic cavities on a diamond substrate with near-surface SiV centers. We examine a particular device with two strongly coupled SiV centers in detail, confirming above-unity cooperativity via multiple independent measurements. Application of an external magnetic field via a permanent magnet enables optical resolution of the SiV spin transitions from which we determine a spin-relaxation time T1>0.4T_1>0.4T1​>0.4 ms at 4 K. We utilize the high cooperativity coupling to observe spin-dependent transmission switching and the quantum jumps of the SiV spin via single-shot readout. These results, coupled with GaP's strong nonlinear properties, establish GaP-on-diamond as a scalable planar platform for quantum network 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.
Chip integration of quantum emitters is a crucial milestone for scalable quantum photonic information processing. Among optically active defect centers for quantum photonics, diamond color centers are promising because of their long spin coherence times and high photon emission rates. However, for a coherent-photon emission, they typically require a cryogenic environment to protect optical coherence from thermal phonons, which makes chip integration challenging. In this paper, we develop a chip-integrated diamond photonic crystal cavity embedding an ensemble of nitrogen-vacancy (NV) centers. We confirm cryogenic operation by observing Purcell enhancement of NV-center emission via an edge-coupled optical fiber. This result demonstrates successful integration of diamond color centers, a photonic crystal cavity, and an optical waveguide-fiber package, representing a key step toward scalable diamond-based quantum communication platforms.