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Global Triplewise Information Trade-off in Quantum Measurement by Hong, Seongjin; Kim, Yong-Su; Cho, Young-Wook; Kim, Jaewan; Lee, Seung-Woo; Lim, Hyang-Tag is a scholarly article available to read on EtoBox.

What is Global Triplewise Information Trade-off in Quantum Measurement about?

State disturbance by a quantum measurement is at the core of foundational quantum physics and constitutes a fundamental basis of secure quantum information processing. While quantifying an information-disturbance relation has been a long-standing problem, recently verified reversibility of a quantum measurement requires to refine such a conventional information trade-off toward a complete picture of information conservation in quantum measurement. Here we experimentally demonstrate complete trade-off relations among all information contents, i.e., information gain, disturbance and reversibility in quantum measurement. By exploring various 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 globally all-at-once, and find that the global trade-off 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

Author

Hong, Seongjin; Kim, Yong-Su; Cho, Young-Wook; Kim, Jaewan; Lee, Seung-Woo; Lim, Hyang-Tag

Published

2021

Language

EN