Bright Telecom Spin-Photon Interface in Silicon Photonics

• URL: http://arxiv.org/abs/2607.18435v2
• Date: Mon, 27 Jul 2026 21:29:02 GMT
• Title: Bright Telecom Spin-Photon Interface in Silicon Photonics
• Abstract summary: Silicon is an attractive host for scalable quantum photonics, but the absence of bright telecom-band emitters has limited its use for spin-photon interfaces.<n>Here we demonstrate the Al1-center, an aluminum--carbon defect in silicon, as a bright waveguide-integrated single-photon emitter with a ground-state spin.
• Score: 2.5817263808189135
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Silicon is an attractive host for scalable quantum photonics, but the absence of bright telecom-band emitters with optically addressable spin states has limited its use for spin-photon interfaces. Here we demonstrate the Al1-center, an aluminum--carbon defect in silicon, as a bright waveguide-integrated single-photon emitter with a ground-state spin. Using isotopically purified silicon-on-insulator nanophotonic devices, we isolate individual Al1-centers and observe high-purity single-photon emission with $g^{(2)}(0)=0.04$ without background subtraction. Time-resolved photoluminescence spectroscopy reveals a fast excited-state lifetime of 135 ns, nearly an order of magnitude shorter than the benchmark provided by the well-studied T-center. Resonant photoluminescence excitation measurements further resolve the zero-phonon transition and reveal a narrow homogeneous linewidth reaching 47 MHz, threefold narrower than the T-center under comparable temperature. Through magneto-optical spectroscopy, we resolve the spin-dependent transitions of the bound-exciton manifold and achieve spin-selective optical pumping, fulfilling the prerequisite for quantum state initialization and readout. These results establish the Al1-center as a bright telecom-band spin-photon interface in silicon photonics and introduce a promising platform for integrated quantum networks.

Related papers

• Epitaxial single T centres in silicon-on-insulator [0.0]
  Spin-photon interfaces based on silicon quantum emitters offer a scalable platform for quantum computing and networking.<n>To overcome this, we utilise high-purity molecular-beam epitaxy (MBE) to epitaxially incorporate single T centres in silicon-on-insulator (SOI) wafers.<n>We demonstrate single T-centre emission coupled to a nanophotonic waveguide and observe significant suppression of homogeneous broadening.
  arXiv  Detail & Related papers  (2026-07-07T13:37:46Z)
• A Single-Molecule Spin-Photon Interface [0.2319165683825004]
  Optical interfaces that connect long-lived spin qubits to photons are a central requirement for quantum networking and distributed quantum information processing.<n>Here we show that a triplet ground state carbene molecule, embedded within a structurally matched host crystal, functions as a robust spin-photon interface with single-molecule addressability.<n>Results establish molecular qubits as a viable platform for single-emitter quantum optics while preserving the advantages of bottom-up chemical design and processable materials.
  arXiv  Detail & Related papers  (2026-05-11T06:59:26Z)
• A scalable gallium-phosphide-on-diamond spin-photon interface [0.0]
  We realize the first high-cooperativity coupling of quantum defects to hybrid-integrated nanophotonics in a scalable, planar platform.<n>We observe spin-dependent transmission switching and the quantum jumps of the SiV spin via single-shot readout.
  arXiv  Detail & Related papers  (2026-01-08T08:55:08Z)
• Erbium Quantum Memory Platform with Long Optical Coherence via Back-End of Line Deposition on Foundry-Fabricated Photonics [0.134821740580602]
  This work demonstrates the monolithic integration of a quantum memory platform with low-loss foundry circuits via back-end-of-line deposition.<n>We deposited thin films of titanium dioxide ($mathrmTiO$) onto silicon nitride nanophotonic waveguides and studied Er optical coherence.<n>Results are comparable to state-of-the-art erbium devices.
  arXiv  Detail & Related papers  (2025-06-21T02:52:01Z)
• Optical spin readout of a silicon color center in the telecom L-band [0.7545833157486899]
  Efficient spin-photon interfaces are crucial for quantum networks, enabling entanglement distribution and information transfer over long distances.<n>Here, we demonstrate the optical detection of spin states in the C center, a carbon-oxygen defect in silicon that exhibits a zero-phonon line at 1571 nm.<n>By combining optical excitation with microwave driving, we achieve optically detected magnetic resonance, enabling spin-state readout via telecom-band optical transitions.
  arXiv  Detail & Related papers  (2025-02-11T15:22:38Z)
• All-optical modulation with single-photons using electron avalanche [66.27103948750306]
  We demonstrate all-optical modulation enabled by electron avalanche process in silicon.<n>Our approach opens the possibility of gigahertz-speed, and potentially even faster, optical switching at the single-photon level.
  arXiv  Detail & Related papers  (2023-12-18T20:14:15Z)
• Room Temperature Fiber-Coupled single-photon devices based on Colloidal Quantum Dots and SiV centers in Back Excited Nanoantennas [91.6474995587871]
  Directionality is achieved with a hybrid metal-dielectric bullseye antenna. Back-excitation is permitted by placement of the emitter at or in a sub-wavelength hole positioned at the bullseye center.
  arXiv  Detail & Related papers  (2023-03-19T14:54:56Z)
• Photophysics of Intrinsic Single-Photon Emitters in Silicon Nitride at Low Temperatures [97.5153823429076]
  A robust process for fabricating intrinsic single-photon emitters in silicon nitride has been recently established. These emitters show promise for quantum applications due to room-temperature operation and monolithic integration with the technologically mature silicon nitride photonics platform.
  arXiv  Detail & Related papers  (2023-01-25T19:53:56Z)
• Purcell enhancement of single-photon emitters in silicon [68.8204255655161]
  Individual spins that are coupled to telecommunication photons offer unique promise for distributed quantum information processing. We implement such an interface by integrating erbium dopants into a nanophotonic silicon resonator. We observe optical Rabi oscillations and single-photon emission with a 78-fold Purcell enhancement.
  arXiv  Detail & Related papers  (2023-01-18T19:38:38Z)
• Silicon nitride waveguides with intrinsic single-photon emitters for integrated quantum photonics [97.5153823429076]
  We show the first successful coupling of photons from intrinsic single-photon emitters in SiN to monolithically integrated waveguides made of the same material. Results pave the way toward the realization of scalable, technology-ready quantum photonic integrated circuitry.
  arXiv  Detail & Related papers  (2022-05-17T16:51:29Z)
• Room temperature single-photon emitters in silicon nitride [97.75917079876487]
  We report on the first-time observation of room-temperature single-photon emitters in silicon nitride (SiN) films grown on silicon dioxide substrates. As SiN has recently emerged as one of the most promising materials for integrated quantum photonics, the proposed platform is suitable for scalable fabrication of quantum on-chip devices.
  arXiv  Detail & Related papers  (2021-04-16T14:20:11Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.