Quantum random-number generators (QRNGs) produce true random numbers, which are guaranteed by the fundamental principles of quantum physics. Miniaturization of QRNGs is crucial for a wide range of communication and cryptography applications. Here, we first report a fully functional QRNG chip based on vacuum-state fluctuations, with dimensions of $16.6\times 7.8{\mathrm{mm}}^2$. The quantum entropy source, which is achieved via hybrid photonic integration with an ${\mathrm{Si}\mathrm{O}}_2$ waveguide, generates raw quantum random numbers. The hybrid photonic and electrical components are assembled into a compact ceramic package using system-in-package technology. A microcontroller unit acquires the raw data and outputs the processed quantum random numbers via a serial peripheral interface. According to the characterization results, the QRNG chip achieves a constant real-time output rate of 5.2 Mbps across the industrial temperature range of $-40$ to $85{}^{\circ }\mathrm{C}$, making it suitable for practical applications.

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• Integrated optics
• Optical quantum information processing
• Quantum cryptography
• Quantum fluctuations & noise
• Quantum state engineering
• Quantum stochastic processes
• Devices
• Homodyne & heterodyne detection