Wafer-Scale Squeezed-Light Chips

• URL: http://arxiv.org/abs/2509.10445v1
• Date: Fri, 12 Sep 2025 17:51:51 GMT
• Title: Wafer-Scale Squeezed-Light Chips
• Authors: Shuai Liu, Kailu Zhou, Yuheng Zhang, Abdulkarim Hariri, Nicholas Reynolds, Bo-Han Wu, Zheshen Zhang,
• Abstract summary: We report wafer-scale fabrication of two-mode squeezed-vacuum states on a fully complementary metal-oxide-semiconductor (CMOS)-compatible silicon nitride (Si$_3$N$_4$) PIC platform.<n>Across a 4-inch wafer, 8 dies yield 2.9-3.1 dB directly measured quadrature squeezing with $ 0.2$ dB variation, demonstrating excellent uniformity.
• Score: 12.435824870106941
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Squeezed-light generation in photonic integrated circuits (PICs) is essential for scalable continuous-variable (CV) quantum information processing. By suppressing quantum fluctuations below the shot-noise limit, squeezed states enable quantum-enhanced sensing and serve as a standard resource for CV quantum information processing. While chip-level squeezed-light sources have been demonstrated, extending this capability to the wafer level with reproducible strong squeezing to bolster large-scale quantum-enhanced sensing and information processing has been hindered by squeezed light's extreme susceptibility to device imperfections. Here, we report wafer-scale fabrication, generation, and characterization of two-mode squeezed-vacuum states on a fully complementary metal-oxide-semiconductor (CMOS)-compatible silicon nitride (Si$_3$N$_4$) PIC platform. Across a 4-inch wafer, 8 dies yield 2.9-3.1 dB directly measured quadrature squeezing with $< 0.2$ dB variation, demonstrating excellent uniformity. This performance is enabled by co-integrating ultralow-loss, strongly overcoupled high-$Q$ microresonators, cascaded pump-rejection filters, and low-loss inverse-tapered edge couplers. The measurements agree with a first-principles theoretical model parameterized solely by independently extracted device parameters and experimental settings. The measured squeezing level can be further improved by enhancing the efficiencies of off-chip detection and chip-to-fiber coupling. These results establish a reproducible, wafer-scale route to nonclassical-light generation in integrated photonics and lay the groundwork for scalable CV processors, multiplexed entanglement sources, and quantum-enhanced sensing.

Related papers

• Integrated photonic platform with high-speed entanglement generation and witnessing [14.998786328611304]
  We experimentally demonstrate entanglement witness on a silicon photonic chip, with multi-rail single-photon entanglement generation based on decoy-state techniques.<n>The detection is based on balanced homodyne detectors on the same photonic chip with a bandwidth of up to 12.5 GHz, which allows room-temperature operation.<n>Results establish a viable path toward fully integrated, high-bandwidth, room-temperature quantum photonic systems.
  arXiv  Detail & Related papers  (2025-10-06T06:55:56Z)
• Quadrature squeezing in a nanophotonic microresonator [42.29248343585333]
  We show single-mode quadrature squeezing in a photonic crystal microresonator via degenerate dual-pump spontaneous four-wave mixing.<n>Results open a promising pathway toward integrated squeezed light sources for quantum-enhanced interferometry, Gaussian boson sampling, coherent Ising machines, and universal quantum computing.
  arXiv  Detail & Related papers  (2025-02-24T17:09:10Z)
• Cavity-Quantum Electrodynamics with Moiré Flatband Photonic Crystals [35.119260614523256]
  A quantum dot can be tuned by a factor of 40, ranging from 42 ps to 1692 ps, which is attributed to strong Purcell enhancement and Purcell inhibition effects.<n>Our findings pave the way for moir'e flatband cavity-enhanced quantum light sources, quantum optical switches, and quantum nodes for quantum internet applications.
  arXiv  Detail & Related papers  (2024-11-25T18:52:11Z)
• Hyper-entanglement between pulse modes and frequency bins [101.18253437732933]
  Hyper-entanglement between two or more photonic degrees of freedom (DOF) can enhance and enable new quantum protocols. We demonstrate the generation of photon pairs hyper-entangled between pulse modes and frequency bins.
  arXiv  Detail & Related papers  (2023-04-24T15:43:08Z)
• On-chip quantum information processing with distinguishable photons [55.41644538483948]
  Multi-photon interference is at the heart of photonic quantum technologies. Here, we experimentally demonstrate that detection can be implemented with a temporal resolution sufficient to interfere photons detuned on the scales necessary for cavity-based integrated photon sources. We show how time-resolved detection of non-ideal photons can be used to improve the fidelity of an entangling operation and to mitigate the reduction of computational complexity in boson sampling experiments.
  arXiv  Detail & Related papers  (2022-10-14T18:16:49Z)
• Fully on-chip photonic turnkey quantum source for entangled qubit/qudit state generation [0.0]
  Integrated photonics has recently become a leading platform for the realization and processing of optical entangled quantum states in chip formats. Here we demonstrate a fully integrated quantum light source, which overcomes these challenges through the combined integration of a laser cavity. The hybrid quantum source employs an electrically-pumped InP gain section and a Si$_3$N$_4$ low-loss microring filter system.
  arXiv  Detail & Related papers  (2022-06-17T12:14:21Z)
• 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)
• Large Single-Phonon Optomechanical Coupling between Quantum Dots and Tightly Confined Surface Acoustic Waves in the Quantum Regime [1.7039969990048311]
  Small acoustic cavities with large zero-point motion are required for high efficiencies. We experimentally establish the feasibility of this platform through electro- and opto-mechanical characterization. We show conversion between microwave phonons and optical photons with sub-natural linewidths.
  arXiv  Detail & Related papers  (2022-05-03T02:53:01Z)
• Topologically Protecting Squeezed Light on a Photonic Chip [58.71663911863411]
  Integrated photonics offers an elegant way to increase the nonlinearity by confining light strictly inside the waveguide. We experimentally demonstrate the topologically protected nonlinear process of spontaneous four-wave mixing enabling the generation of squeezed light on a silica chip.
  arXiv  Detail & Related papers  (2021-06-14T13:39:46Z)
• Near-ideal spontaneous photon sources in silicon quantum photonics [55.41644538483948]
  Integrated photonics is a robust platform for quantum information processing. Sources of single photons that are highly indistinguishable and pure, that are either near-deterministic or heralded with high efficiency, have been elusive. Here, we demonstrate on-chip photon sources that simultaneously meet each of these requirements.
  arXiv  Detail & Related papers  (2020-05-19T16:46:44Z)
• Resonance fluorescence from waveguide-coupled strain-localized two-dimensional quantum emitters [0.0]
  We show a scalable approach using a silicon nitride photonic waveguide to strain-localize single-photon emitters from a tungsten diselenide (WSe2) monolayer and to couple them into a waveguide mode. Our results are an important step to enable coherent control of quantum states and multiplexing of high-quality single photons in a scalable photonic quantum circuit.
  arXiv  Detail & Related papers  (2020-02-18T15:45:00Z)
• Near-degenerate quadrature-squeezed vacuum generation on a silicon-nitride chip [54.87128096861778]
  In this Letter, we demonstrate the generation of quadrature-phase squeezed states in the radio-frequency carrier sideband using a small-footprint silicon-nitride microresonator with a dual-pumped four-wave-mixing process. It is critical to account for the nonlinear behavior of the pump fields to properly predict the squeezing that can be generated in this system.
  arXiv  Detail & Related papers  (2020-02-04T01:41:41Z)

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.