■Title :  New Frontiers in Quantum Measurement: Experimental Evaluation of Error and  Disturbance on Quantum Computers 
■Place : IMI Auditorium(W1-D-413) and Live streaming with Zoom
■Speaker :  Mr. Haruki Emori, Graduate School of Information Science and Technology,  Hokkaido University/RIKEN Center for Interdisciplinary Theoretical and Mathematical  Sciences (iTHEMS) 
■Attendance: 49(Students: 21; Staff: 16;Others:12)

At this colloquium, the speaker gave a lecture entitled “New Frontiers in Quantum Measurement: Experimental Evaluation of Error and Disturbance on Quantum Computers”. The speaker focused on “error” and “disturbance” in quantum measurement and explained how to evaluate them mathematically. First, he reviewed previous studies; the definition of the disturbance to be evaluated, its equivalent representation, and its analytical calculation. Then, he introduced the proposed approach to evaluation utilizing the decoherence and explained its mathematical derivation and characteristics. After an overview of quantum computers, the results of numerical experiments using quantum computers were presented, and the trends of multiple evaluation methods and the features of the proposed method were also reported.
The study on mathematically evaluating and performing quantum measurements, which is indispensable for the development of quantum science and technology, was very meaningful for people in a wide range of fields involved in mathematics. The question-and-answer session was very active, and discussions with faculty members and students continued after the colloquium, indicating that the participants were very interested in the speaker’s research.