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Quantum Cryptography Research Platform
QCRP (Quantum Cryptography Research Platform) is a quantum cryptography research platform dedicated to delivering high-speed signal driving and data processing capabilities.
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The infrared single-photon detection module, as an important technology for detecting weak signals, finds extensive applications across numerous fields in physics, astronomy, chemistry, biology, medicine, and other disciplines.
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1.25 GHz Infrared Single-Photon Detector
The WT-SPD320 infrared single-photon detector operates at a frequency as high as 1.25 GHz and uses an InGaAs/InP single-photon avalanche diode (SPAD) as its photosensitive element. It features an integrated multi-stage cooler and employs a sinusoidal gating mode. This detector boasts high integration, high detection efficiency, low dark count rate, and low afterpulse rate. It supports customizable frequency settings and single/dual-channel configurations. Moreover, the detector offers a wide range of user-friendly operational functions, including support for both internal and external clock triggering, synchronized clock output, and adjustable detection efficiency and dead time—all via an intuitive user interface and set of convenient interfaces.
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Infrared single-photon detector
Single-photon detectors are instruments for detecting weak signals at the single-photon level, playing an indispensable role in numerous fields such as quantum optics, biophotonics, and laser ranging. In recent years, single-photon detectors have been widely used in the field of quantum cryptography and have become the core device for photoelectric conversion of quantum signals.
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Infrared free-running single-photon detector
The WT-SPDM400 infrared free-running single-photon detector module employs a negative-feedback InGaAs/InP single-photon avalanche diode (NFAD) as its photosensitive element. The element operates in Geiger mode and features rapid avalanche quenching, effectively suppressing the afterpulse effect. An internal temperature-control circuit ensures that the APD operates at a low temperature, thereby reducing the dark count rate. Additionally, the module allows for adjustable dead times—both short and long—which further help to suppress the afterpulse effect.
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The high-speed picosecond laser is an instrument widely used in scientific research fields such as laser ranging, optical measurement, and fluorescence lifetime analysis. In recent years, with the development of quantum cryptography, the high-speed picosecond laser has emerged as a core device for generating quantum signals, serving as a single-photon source.
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The high-speed clock generator is an instrument widely used in scientific research fields such as fast electronics, precision instrument excitation, semiconductors, and device testing.
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The delay signal counter is an instrument widely used in scientific research fields such as high-speed signal analysis and control, precise delay adjustment, and trigger-based counting. In recent years, with the development of quantum cryptography, the delay signal counter has become an essential tool for experimental studies on quantum signals.
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Multi-channel pulse signal source
The multi-channel pulse signal source is a high-speed, multi-channel pulse signal generation module. This signal source module boasts advantages such as multiple channels, high speed, and low jitter, and supports triggering by both internal and external reference sources. It also features independently adjustable single-channel delays, making it widely applicable in fields such as laser ranging, LiDAR, and quantum key distribution systems.
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A time-to-digital converter is an instrument that can identify the timing of events and convert analog signals into digital signals. It is widely used in scientific research fields such as statistical analysis of post-pulse distributions in lasers, measurement of particle collision times, quantum optics, quantum key distribution, optical detection, and lidar ranging.
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Uncertainty Relation Experimental Setup
The Uncertainty Principle Experimental Setup is a visualization platform specifically designed for teaching quantum mechanics. It aims to provide an intuitive verification of Heisenberg’s Uncertainty Principle through optical interference and diffraction phenomena, while also exploring the intrinsic relationships among conjugate variables such as position-momentum and time-energy. By integrating core concepts of quantum mechanics with classical optical experiments, this setup employs an “seeing-is-believing” interactive approach to help students break free from conventional classical physics mental frameworks and lay a practical foundation for understanding theories like quantum measurement and wave-particle duality.
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Michelson interferometer experimental setup
The Michelson interferometer is an experimental instrument specifically designed for undergraduate programs in optoelectronics and quantum information. Based on the principle of Michelson interference, it is a precision optical instrument that employs the amplitude-splitting method. It is primarily used to measure physical quantities such as optical path difference, length, and refractive index, and finds applications in modern science—including gravitational-wave detection. Thanks to its ingenious design and versatile functionality, the Michelson interferometer remains a cornerstone tool in optical experiments and precision measurements. Moreover, various modern interferometers derived from its underlying principles continue to drive advancements in both scientific research and industrial technology.
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Polarization and 3D Imaging Experimental Setup
The Polarization and 3D Imaging Experiment Kit is an innovative experimental set specifically designed for optics education. Through hands-on, intuitive experiments, it helps students explore the principles of polarized light and its real-world applications. The kit includes components such as 3D glasses, high-precision polarization filters, and a genuine movie screen, enabling the construction of three different 3D imaging systems that deliver cinema-quality stereoscopic visual effects and vividly reveal the mysteries of polarized light behind 3D movie technology.
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Quantum eraser experimental setup
The quantum eraser experimental setup is a quantum-optical system designed based on the Mach-Zehnder interferometer. Its core components include a laser, a beam splitter, polarization-modulation elements, and an observation screen. By controllably marking and then erasing path information, this setup provides a直观 demonstration of quantum superposition, the principle of complementarity, and the delayed-choice effect. It serves as a key experimental platform for studying quantum measurement and information evolution.
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A solid-state laser is a highly efficient optical system built upon a solid-state gain medium—such as neodymium-doped yttrium aluminum garnet crystal (Nd:YAG) or titanium-doped sapphire crystal. Its core function is to generate a high-brightness, highly coherent laser output via stimulated emission.
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Quantum Key Distribution Demonstration Experimental Setup
The quantum key distribution demonstration experimental setup is a modular teaching system designed based on the BB84 protocol, specifically developed for optical and information security courses in higher vocational colleges. It includes core components such as a polarization-encoded laser source (850 nm), a manual polarization controller, and a single-photon detector, and supports the construction of simple optical setups to simulate the quantum key distribution process.
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Small BBO Polarization Entanglement Source Teaching System
The compact BBO polarization-entanglement source system, based on the spontaneous parametric down-conversion process in a nonlinear crystal, enables the generation, collection, and characterization of entangled photon pairs. This system not only draws upon a wide range of theoretical knowledge—including geometrical optics, polarization optics, nonlinear optics, and quantum mechanics—but also integrates various experimental techniques. It holds great promise for fundamental research in quantum information, experimental teaching, and public outreach in quantum science. With its compact design, the system features a partitioned layout that separates the entanglement-generation module from the characterization module, making it particularly user-friendly and easy to learn and operate for beginners.
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Entanglement Source Teaching Device
The Quantum Entanglement Teaching Kit is an all-in-one experimental teaching toolbox specifically designed for upper-level undergraduate students or early-stage graduate students.
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Single-photon HBT interference module
The single-photon HBT interference module allows students, through experimental procedures, to understand the principles of single-photon interference and master the functions and usage of various related optical components. Using entangled photon pairs as the experimental subject, students will measure single-photon interference curves.
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Two-photon HOM interference module
The two-photon HOM interference module allows students, through experimental operations, to understand the principle of two-photon interference, master methods for setting up and aligning optical paths, and measure the two-photon interference curve.
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