HomePhysicsStudy redefines what information is important in quantum measurements

Study redefines what information is important in quantum measurements

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Korea Institute of Science and Technology scientists have tried to capture the interplay between different types of information that are important at the time of collecting quantum measurements. These are information gain, disturbance and reversibility. The study has been published in Physical Review Letters. The study represented for the first time these three key quantities related to quantum measurement in a single trade-off relation.

The three crucial quantities impacting quantum measurement procedures are information gain, disturbance and reversibility. To scientists, the key objective of the recent work was to show that there is a trade-off relation between all these three quantities. Scientists built an interferometer that merges two or more sources of light together. It will create an interference pattern that can then be measured and analysed. Scientists created interferometer which can couple photonic qutrits with path degrees of freedom.

Study redefines what information is important in quantum measurements
Image showing the information trade-off relation simultaneously encompassing all information contents in quantum measurements. Credit: Hong et al.

Based on the measurements they collected, scientists were able to estimate three types of information content. They demonstrated a complete information trade-off. They manipulated a photonic qutrit state and the strengths of quantum measurement. The study showed that quantum measurements split the information of a quantum state into three different parts.

These are information gain, disturbance and reversibility. Scientists gathered some data that could have numerous important implications. They delineated the most important quantities for preserving information at the time of collecting quantum measurements. The study also paved the way for the development of more secure quantum information processing tools.

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