  SpinQ Triangulum is the second generation of the desktop quantum computers
designed and manufactured by SpinQ Technology. SpinQ's desktop quantum computer
series, based on room temperature NMR spectrometer, provide light-weighted,
cost-effective and maintenance-free quantum computing platforms that aim to
provide real-device experience for quantum computing education for K-12 and
college level. These platforms also feature quantum control design capabilities
for studying quantum control and quantum noise. Compared with the first
generation product, the two-qubit SpinQ Gemini, Triangulum features a
three-qubit QPU, smaller dimensions (61 * 33 * 56 cm^3) and lighter (40 kg).
Furthermore, the magnetic field is more stable and the performance of quantum
control is more accurate. This paper introduces the system design of Triangulum
and its new features. As an example of performing quantum computing tasks, we
present the implementation of the Harrow-Hassidim-Lloyd (HHL) algorithm on
Triangulum, demonstrating Triangulum's capability of undertaking complex
quantum computing tasks. SpinQ will continue to develop desktop quantum
computing platform with more qubits. Meanwhile, a simplified version of SpinQ
Gemini, namely Gemini Mini (https://www.spinq.cn/products#geminiMini-anchor) ,
has been recently realised. Gemini Mini is much more portable (20* 35 * 26
cm^3, 14 kg) and affordable for most K-12 schools around the world.
