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

Towards Scalable Quantum Networks of Spin Qubits in Photonics Integrated Circuits

Dirk Englund, Luozhou Li, Tim Schröder, Edward H. Chen, Michael E. Walsh, Igal Bayn, Sara Mouradian, Matthew E. Trusheim, Ming Chang Lu, Mircea Cotlet, Matthew Markham, Daniel J. Twitchen, Michal F. Lipson, Karl K. Berggren

Published Jan 1, 2015• 0 citations
Publisher

Abstract

We discuss progress towards the development of on-chip quantum networks of multiple spin qubits in nitrogen vacancy (NV) centers in diamond. We report NV-nanocavity systems in the strong Purcell regime; implantation of NVs with nanometer-scale apertures, including into cavity field maxima; hybrid on-chip networks for integration of multiple functional NV-cavity systems; and scalable integration of superconducting nanowire single photon detectors on-chip.

DOI
10.1364/cleo_qels.2015.fw1a.5

Related papers

Towards scalable networks of solid-state quantum memories in a photonic integrated circuit (Presentation Recording)

Dirk Englund

A central goal of quantum information science is the entanglement of multiple quantum memories that can be individually controlled. Here, we discuss progress towards photonic integrated circuits designed to enable efficient optical interactions between multiple spin qubits in nitrogen vacancy (NV) centers in diamond. We describe NV-nanocavity systems in the strong Purcell regime with optical quality factors approaching 10,000 and electron spin coherence times exceeding 200 μs; implantation of NVs with nanometer-scale apertures, including into cavity field maxima; hybrid on-chip networks for integration of multiple functional NV-cavity systems; and scalable integration of superconducting nanowire single photon detectors on-chip.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Sep 1, 2015•0 citations

Towards On-Chip Quantum Networks based on Spin Qubits in Diamond

Tim Schröder, Luozhou Li, Edward H. Chen +13 more

A central aim of quantum information processing is the efficient entanglement of multiple stationary quantum memories via photons. Recently, quantum entanglement and teleportation have been shown between two nitrogen-vacancy memories (NV)1, but scaling to larger networks requires more efficient spin-photon interfaces, using optical resonators and efficient nanophotonic collection strategies. Here, we discuss progress towards the development of on-chip photonic integrated circuits (PICs) with multiple NV quantum memories entangled via photons.

OSA Advanced Photonics Congress•Jan 1, 2015•0 citations

Quantum Optics in Diamond Nanophotonic Chips

Dirk Englund

Abstract : This report summarizes our recent progress on the development of photonic nanostructures for sensing and information processing. We have developed a nitrogen vacancy (NV) spin qubit-cavity system in the strong Purcell regime in which the spin qubit predominantly interacts with the cavity mode. This system is realized in a single-crystal diamond photonic crystal nanocavity with quality factors (Q) up to 104. Furthermore, we measure electron spin coherence times of cavity-coupled NVs of 200 us. We have also developed techniques for NV-based super-resolution imaging and precision sensing, using high-speed parallel readout on a microscope camera; and we have developed techniques for precision clocks based on collective oscillation of ensembles of NVs. We also report on graphene electro-optic devices and sensors.

•Jul 1, 2014•0 citations

Coherent spin control of a nanocavity-enhanced qubit in diamond

Luozhou Li, Tim Schröder, Edward H. Chen +11 more

A central aim of quantum information processing is the efficient entanglement of multiple stationary quantum memories via photons. Among solid-state systems, the nitrogen-vacancy centre in diamond has emerged as an excellent optically addressable memory with second-scale electron spin coherence times. Recently, quantum entanglement and teleportation have been shown between two nitrogen-vacancy memories, but scaling to larger networks requires more efficient spin-photon interfaces such as optical resonators. Here we report such nitrogen-vacancy-nanocavity systems in the strong Purcell regime with optical quality factors approaching 10,000 and electron spin coherence times exceeding 200 μs using a silicon hard-mask fabrication process. This spin-photon interface is integrated with on-chip microwave striplines for coherent spin control, providing an efficient quantum memory for quantum networks. Nitrogen-vacancy centres in diamond have established themselves as excellent candidates for solid-state quantum memories due to their optical addressability and long coherence times. Here, the authors report on a diamond-nanocavity system with improved spin-photon interface performances.

arXiv:1409.1602•Nature Communications•Jan 28, 2015•200 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

Integration of Diamond-Based Quantum Emitters with Nanophotonic Circuits

Philip P. J. Schrinner, Jan Olthaus, Doris E. Reiter +1 more

Nanophotonics provides a promising approach to advance quantum technology by replicating fundamental building blocks of nanoscale quantum optic systems in large numbers with high reproducibility on monolithic chips. While photonic integrated circuit components and single-photon detectors offer attractive performance on silicon chips, the large-scale integration of individually accessible quantum emitters has remained a challenge. Here, we demonstrate simultaneous optical access to several integrated solid-state spin systems with Purcell-enhanced coupling of single photons with high modal purity from lithographically positioned nitrogen vacancy centers into photonic integrated circuits. Photonic crystal cavities embedded in networks of tantalum pentoxide-on-insulator waveguides provide efficient interfaces to quantum emitters that allow us to optically detect magnetic resonances (ODMR) as desired in quantum sensing. Nanophotonic networks that provide configurable optical interfaces to nanoscale quantum emitters via many independent channels will allow for novel functionality in photonic quantum information processors and quantum sensing schemes.

Nano Letters•Nov 2, 2020•63 citations
We discuss progress towards the development of on-chip quantum networks of multiple spin qubits in nitrogen vacancy (NV) centers in diamond. We report NV-nanocavity systems in the strong Purcell regime; implantation of NVs with nanometer-scale apertures, including into cavity field maxima; hybrid on-chip networks for integration of multiple functional NV-cavity systems; and scalable integration of superconducting nanowire single photon detectors on-chip.
A central goal of quantum information science is the entanglement of multiple quantum memories that can be individually controlled. Here, we discuss progress towards photonic integrated circuits designed to enable efficient optical interactions between multiple spin qubits in nitrogen vacancy (NV) centers in diamond. We describe NV-nanocavity systems in the strong Purcell regime with optical quality factors approaching 10,000 and electron spin coherence times exceeding 200 μs; implantation of NVs with nanometer-scale apertures, including into cavity field maxima; hybrid on-chip networks for integration of multiple functional NV-cavity systems; and scalable integration of superconducting nanowire single photon detectors on-chip.
A central aim of quantum information processing is the efficient entanglement of multiple stationary quantum memories via photons. Recently, quantum entanglement and teleportation have been shown between two nitrogen-vacancy memories (NV)1, but scaling to larger networks requires more efficient spin-photon interfaces, using optical resonators and efficient nanophotonic collection strategies. Here, we discuss progress towards the development of on-chip photonic integrated circuits (PICs) with multiple NV quantum memories entangled via photons.
Abstract : This report summarizes our recent progress on the development of photonic nanostructures for sensing and information processing. We have developed a nitrogen vacancy (NV) spin qubit-cavity system in the strong Purcell regime in which the spin qubit predominantly interacts with the cavity mode. This system is realized in a single-crystal diamond photonic crystal nanocavity with quality factors (Q) up to 104. Furthermore, we measure electron spin coherence times of cavity-coupled NVs of 200 us. We have also developed techniques for NV-based super-resolution imaging and precision sensing, using high-speed parallel readout on a microscope camera; and we have developed techniques for precision clocks based on collective oscillation of ensembles of NVs. We also report on graphene electro-optic devices and sensors.
A central aim of quantum information processing is the efficient entanglement of multiple stationary quantum memories via photons. Among solid-state systems, the nitrogen-vacancy centre in diamond has emerged as an excellent optically addressable memory with second-scale electron spin coherence times. Recently, quantum entanglement and teleportation have been shown between two nitrogen-vacancy memories, but scaling to larger networks requires more efficient spin-photon interfaces such as optical resonators. Here we report such nitrogen-vacancy-nanocavity systems in the strong Purcell regime with optical quality factors approaching 10,000 and electron spin coherence times exceeding 200 μs using a silicon hard-mask fabrication process. This spin-photon interface is integrated with on-chip microwave striplines for coherent spin control, providing an efficient quantum memory for quantum networks. Nitrogen-vacancy centres in diamond have established themselves as excellent candidates for solid-state quantum memories due to their optical addressability and long coherence times. Here, the authors report on a diamond-nanocavity system with improved spin-photon interface performances.
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.
Nanophotonics provides a promising approach to advance quantum technology by replicating fundamental building blocks of nanoscale quantum optic systems in large numbers with high reproducibility on monolithic chips. While photonic integrated circuit components and single-photon detectors offer attractive performance on silicon chips, the large-scale integration of individually accessible quantum emitters has remained a challenge. Here, we demonstrate simultaneous optical access to several integrated solid-state spin systems with Purcell-enhanced coupling of single photons with high modal purity from lithographically positioned nitrogen vacancy centers into photonic integrated circuits. Photonic crystal cavities embedded in networks of tantalum pentoxide-on-insulator waveguides provide efficient interfaces to quantum emitters that allow us to optically detect magnetic resonances (ODMR) as desired in quantum sensing. Nanophotonic networks that provide configurable optical interfaces to nanoscale quantum emitters via many independent channels will allow for novel functionality in photonic quantum information processors and quantum sensing schemes.