[NCTS Physics Research Highlights] Chiao-Hsuan Wang 'Quantum Capacities of Transducers', Nature Communications 13, 6698 (2022)

• 2023-11-24
• Chen, Jhan Yu 陳詹喻
• Quantum Information and Quantum Computing Quantum computing and interdisciplinary applications

Quantum Capacities of Transducers 轉換器的量子容量

Chiao-Hsuan Wang*, Fangxin Li & Liang Jiang
Nature Communications 13, 6698 (2022)
DOI: https://doi.org/10.1038/s41467-022-34373-8

Quantum transducers, which can faithfully convert quantum information between disparate physical carriers, are essential in quantum science and technology. We utilize quantum capacity, the highest achievable quantum communication rate through a channel, to define a single metric that quantifies the performance of transducers. We discover that the optimal designs of transducers are those with maximally flat frequency response and identify the fundamental limits on the quantum communication rate through transducers.

量子網路為資訊加密傳輸和分散計算的關鍵技術。量子轉換器是實現量子網路的重要元件，能將量子資訊在不同物理系統之間做轉換。我們使用量子容量，即量子資訊透過通道傳輸的最高速度，來定義量子轉換器的表現指標。由此，我們發現量子轉換器的最佳設計需有最大平坦的頻率響應曲線，並且找出量子轉換器的資訊傳輸速率之根本極限。