The year 2025 marks the 100th anniversary of the birth of quantum mechanics, and UNESCO has designated it as the International Year of Quantum Science and Technology. Max Planck’s introduction of energy quantization, followed by Albert Einstein’s idea of light quantum, heralded the advent of quantum mechanics. To highlight the milestone that quantum science and technology have established in human technological innovation, Chunghwa Post has released a souvenir sheet with four NT$15 stamps, featuring golden metallic hot foil stamping. The themes of the stamps are “Blackbody Radiation, Photoelectric Effect,” “Compton Effect, Bohr’s Atomic Model,” “Wave Packet, Schrödinger’s Cat” and “Quantum Bit, Quantum Communication.” These themes advocate for research and contributions in fundamental quantum science and highlight the crucial role of quantum technology in developing sustainable energy, medicine, communications, industrial infrastructure, and financial security. It also expresses the hope that Taiwan will continue to strengthen its quantum technology research capacity and enhance its international visibility.To purchase postage stamps, please go directly to the post office branches, Postal Museum or order on line at https://stamp.post.gov.tw.