홍성진 김용수 Cho, Young Wook 김재완 이승우 임향택 2024-01-19T12:34:12Z 2024-01-19T12:34:12Z 2022-02-17 2022-02 0031-9007 https://pubs.kist.re.kr/handle/201004/115680 While an information-disturbance trade-off in quantum measurement has been at the core of foundational quantum physics and constitutes a basis of secure quantum information processing, recently verified reversibility of a quantum measurement requires to refine it toward a complete version of information tradeoff in quantum measurement. Here we experimentally demonstrate a trade-off relation among all information contents, i.e., information gain, disturbance, and reversibility in quantum measurement. By exploring quantum measurements applied on a photonic qutrit, we observe that the information of a quantum state is split into three distinct parts accounting for the extracted, disturbed, and reversible information. We verify that such different parts of information are in trade-off relations not only pairwise but also triplewise all at once, and find that the triplewise relation is tighter than any of the pairwise relations. Finally, we realize optimal quantum measurements that inherently preserve quantum information without loss of information, which offer wider applications in measurement-based quantum information processing. English American Physical Society Demonstration of Complete Information Trade-Off in Quantum Measurement Article 10.1103/PhysRevLett.128.050401 1 Physical Review Letters, v.128, no.5 Physical Review Letters 128 5 N scie scopus 000759200500001 2-s2.0-85124684610 Physics, Multidisciplinary Physics Article STATE GAIN REVERSIBILITY ENTANGLEMENT DISTURBANCE BALANCE