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

Improving the Optical Coherence of Diamond Tin-Vacancy Centers by Heralded Initialization

Julia M. Brevoord, Lorenzo De Santis, T. Yamamoto, Matteo Pasini, Nina Codreanu, Tim Turan, Hans K. C. Beukers, Christopher Waas, Ronald Hanson

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We demonstrate heralded initialization of charge state and optical transition frequency of diamond tin-vacancy centers, using (off-)resonant lasers, photon detection and real-time logic. Using this, we show frequency tunability > 100 MHz and strongly improved optical coherence.
DOI
10.1364/cleo_fs.2024.fm3f.2

Related papers

Heralded initialization of charge state and optical-transition frequency of diamond tin-vacancy centers

Julia M. Brevoord, Lorenzo De Santis, T. Yamamoto +6 more

Diamond tin-vacancy centers have emerged as a promising platform for quantum information science and technology. A key challenge for their use in more-complex quantum experiments and scalable applications is the ability to prepare the center in the desired charge state with the optical transition at a predefined frequency. Here we report on heralding such successful preparation using a combination of laser excitation, photon detection, and real-time logic. We first show that fluorescence photon counts collected during an optimized resonant probe pulse strongly correlate with the subsequent charge state and optical-transition frequency, enabling real-time heralding of the desired state through threshold photon counting. We then implement and apply this heralding technique to photoluminescence-excitation measurements, coherent optical driving, and an optical Ramsey experiment, finding strongly increased optical coherence with increasing threshold. Finally, we demonstrate that the prepared optical frequency follows the probe laser across the inhomogeneous linewidth, enabling tuning of the transition frequency over multiple homogeneous linewidths. Published by the American Physical Society 2024

arXiv:2311.11962•Physical Review Applied•May 23, 2024•15 citations

Large-Range Optical Resonant Frequency Tuning and Stabilization of Diamond Tin-Vacancy Centers

Julia M. Brevoord, Leonardo G. C. Wienhoven, Nina Codreanu +10 more

We demonstrate large-range tuning of the optical transition of Tin-Vacancies (SnV) in diamond using electro-mechanical-induced strain, realizing >40 GHz tuning. We employ real-time feedback on the strain environment to stabilize the resonant frequency.

Quantum 2.0 Conference and Exhibition•Jan 1, 2025•0 citations

Electrical Tuning of Tin-Vacancy Centers in Diamond

Shahriar Aghaeimeibodi, Daniel Riedel, Alison E. Rugar +2 more

Many applications in quantum information processing require multiple, identical quantum emitters. Among various color centers in diamond, tin-vacancy centers draw attention because of their high quantum efficiency and long spin coherence. The authors study the shifts of optical-transition frequencies of these centers in an applied electric field, and importantly find that both the linear and quadratic coefficients are orders of magnitude smaller than those of non-inversion-symmetric defects such as nitrogen-vacancy centers. This low susceptibility allows the integration of tin-vacancy centers into photonic nanostructures, which is essential for efficient spin-photon interfaces.

arXiv:2103.01917•Physical Review Applied•Jun 3, 2021•37 citations

Quantum Photonic Interface for Tin-Vacancy Centers in Diamond

Alison E. Rugar, Shahriar Aghaeimeibodi, Daniel Riedel +6 more

The realization of quantum networks critically depends on establishing efficient, coherent light-matter interfaces. Optically active spins in diamond have emerged as promising quantum nodes based on their spin-selective optical transitions, long-lived spin ground states, and potential for integration with nanophotonics. Tin-vacancy (SnV$^{\,\textrm{-}}$) centers in diamond are of particular interest because they exhibit narrow-linewidth emission in nanostructures and possess long spin coherence times at temperatures above 1 K. However, a nanophotonic interface for SnV$^{\,\textrm{-}}$ centers has not yet been realized. Here, we report cavity enhancement of the emission of SnV$^{\,\textrm{-}}$ centers in diamond. We integrate SnV$^{\,\textrm{-}}$ centers into one-dimensional photonic crystal resonators and observe a 40-fold increase in emission intensity. The Purcell factor of the coupled system is 25, resulting in channeling of the majority of photons ($90\%$) into the cavity mode. Our results pave the way for the creation of efficient, scalable spin-photon interfaces based on SnV$^{\,\textrm{-}}$ centers in diamond.

arXiv:2102.11852•Physical Review X•Jul 26, 2021•103 citations

Two-Photon Interference of Photons from Remote Tin-Vacancy Centers in Diamond

Vladislav Bushmakin, Oliver von Berg, Colin Sauerzapf +8 more

Scalable quantum networks rely on optical connections between long-lived qubits to distribute entanglement. Tin vacancies in diamond have emerged as promising long-lived qubits, offering extended spin coherence times at liquid helium temperatures and spin-dependent, highly coherent optical transitions for effective photon-based communication. Connecting remote nodes requires quantum interference of indistinguishable photons, which is challenging in an inhomogeneous solid-state environment. Here, we demonstrate a two-node experiment with tin vacancies in diamond, which exhibit a resonant frequency distribution spanning approximately 8 GHz. To overcome the frequency mismatch, we tune the resonant frequencies of one node using the Stark effect. We achieve tunability up to 4 GHz while maintaining optical coherence. As a demonstration, we achieve detuning-dependent remote two-photon interference between separate nodes, obtaining 80(6)% interference visibility without postprocessing when the defects' optical transitions are tuned into resonance, and 63(8)% with detuning up to 20 times their natural linewidths. These results highlight the potential of tin-vacancy centres in diamond for establishing robust optical links between remote quantum registers.

arXiv:2412.17539•Dec 23, 2024•2 citations

Charge State Transition of Spectrally Stabilized Tin-Vacancy Centers in Diamond

Keita Ikeda, Yiyang Chen, Peng Wang +5 more

High Resolution Image Download MS PowerPoint Slide Solid-state quantum emitters are important platforms for quantum information processing. The fabrication of the emitters with stable photon frequency and narrow line width is a fundamental issue, and it is essential to understand optical conditions under which the emitter keeps a bright charge state or transitions to a dark state. For these purposes, in this study, we investigate the spectral stability and charge state transition of tin-vacancy (SnV) centers in diamond. The photoluminescence excitation spectra of multiple SnV centers are basically stable over time with nearly transform-limited line widths under resonant excitation, while simultaneous irradiation of resonant and nonresonant lasers makes spectra from the SnV centers unstable. We find that the instability occurs due to the charge state transition to a dark state. The charge state transition rates are quantitatively investigated depending on the laser powers. Lastly, with first-principles calculations, we model the charge state transition of the SnV center under laser irradiation.

arXiv:2412.07087•ACS Photonics•Mar 4, 2025•4 citations
Diamond tin-vacancy centers have emerged as a promising platform for quantum information science and technology. A key challenge for their use in more-complex quantum experiments and scalable applications is the ability to prepare the center in the desired charge state with the optical transition at a predefined frequency. Here we report on heralding such successful preparation using a combination of laser excitation, photon detection, and real-time logic. We first show that fluorescence photon counts collected during an optimized resonant probe pulse strongly correlate with the subsequent charge state and optical-transition frequency, enabling real-time heralding of the desired state through threshold photon counting. We then implement and apply this heralding technique to photoluminescence-excitation measurements, coherent optical driving, and an optical Ramsey experiment, finding strongly increased optical coherence with increasing threshold. Finally, we demonstrate that the prepared optical frequency follows the probe laser across the inhomogeneous linewidth, enabling tuning of the transition frequency over multiple homogeneous linewidths. Published by the American Physical Society 2024
Many applications in quantum information processing require multiple, identical quantum emitters. Among various color centers in diamond, tin-vacancy centers draw attention because of their high quantum efficiency and long spin coherence. The authors study the shifts of optical-transition frequencies of these centers in an applied electric field, and importantly find that both the linear and quadratic coefficients are orders of magnitude smaller than those of non-inversion-symmetric defects such as nitrogen-vacancy centers. This low susceptibility allows the integration of tin-vacancy centers into photonic nanostructures, which is essential for efficient spin-photon interfaces.
The realization of quantum networks critically depends on establishing efficient, coherent light-matter interfaces. Optically active spins in diamond have emerged as promising quantum nodes based on their spin-selective optical transitions, long-lived spin ground states, and potential for integration with nanophotonics. Tin-vacancy (SnV -^{\,\textrm{-}}-) centers in diamond are of particular interest because they exhibit narrow-linewidth emission in nanostructures and possess long spin coherence times at temperatures above 1 K. However, a nanophotonic interface for SnV -^{\,\textrm{-}}- centers has not yet been realized. Here, we report cavity enhancement of the emission of SnV -^{\,\textrm{-}}- centers in diamond. We integrate SnV -^{\,\textrm{-}}- centers into one-dimensional photonic crystal resonators and observe a 40-fold increase in emission intensity. The Purcell factor of the coupled system is 25, resulting in channeling of the majority of photons (90%90\%90%) into the cavity mode. Our results pave the way for the creation of efficient, scalable spin-photon interfaces based on SnV -^{\,\textrm{-}}- centers in diamond.
Scalable quantum networks rely on optical connections between long-lived qubits to distribute entanglement. Tin vacancies in diamond have emerged as promising long-lived qubits, offering extended spin coherence times at liquid helium temperatures and spin-dependent, highly coherent optical transitions for effective photon-based communication. Connecting remote nodes requires quantum interference of indistinguishable photons, which is challenging in an inhomogeneous solid-state environment. Here, we demonstrate a two-node experiment with tin vacancies in diamond, which exhibit a resonant frequency distribution spanning approximately 8 GHz. To overcome the frequency mismatch, we tune the resonant frequencies of one node using the Stark effect. We achieve tunability up to 4 GHz while maintaining optical coherence. As a demonstration, we achieve detuning-dependent remote two-photon interference between separate nodes, obtaining 80(6)% interference visibility without postprocessing when the defects' optical transitions are tuned into resonance, and 63(8)% with detuning up to 20 times their natural linewidths. These results highlight the potential of tin-vacancy centres in diamond for establishing robust optical links between remote quantum registers.
High Resolution Image Download MS PowerPoint Slide Solid-state quantum emitters are important platforms for quantum information processing. The fabrication of the emitters with stable photon frequency and narrow line width is a fundamental issue, and it is essential to understand optical conditions under which the emitter keeps a bright charge state or transitions to a dark state. For these purposes, in this study, we investigate the spectral stability and charge state transition of tin-vacancy (SnV) centers in diamond. The photoluminescence excitation spectra of multiple SnV centers are basically stable over time with nearly transform-limited line widths under resonant excitation, while simultaneous irradiation of resonant and nonresonant lasers makes spectra from the SnV centers unstable. We find that the instability occurs due to the charge state transition to a dark state. The charge state transition rates are quantitatively investigated depending on the laser powers. Lastly, with first-principles calculations, we model the charge state transition of the SnV center under laser irradiation.