Efficient identification of unitary quantum processes


Y Wang, Q Yin, D Dong, B Qi, IR Petersen, Z Hou, H Yonezawa, G Xiang

2017 Australian and New Zealand Control Conference (ANZCC) (2018)

Efficient identification of unitary quantum processes
Identifying an unknown unitary quantum process is a fundamental task in the development of quantum technology. In this paper, we propose an efficient identification algorithm for estimating unitary processes. In the method, input pure states are used and a fast quantum state tomography algorithm is developed to reconstruct the output states. Then the information of the output states is used to estimate the unitary process. The identification algorithm has computational complexity O(d3) for a d-dimensional system. Numerical results show that the proposed identification algorithm is much more efficient than the maximum likelihood estimation method and works well for input mixed states with high purity. An analytical upper bound for the identification error is also provided, and numerical simulations and experimental results on quantum optical systems verify the theoretical results.

University: UNSW Sydney

Authors Centre Participants: Dr. Hidehiro Yonezawa, Mr. Yuanlong Wang, Q Yin, D Dong, B Qi, IR Petersen, Z Hou, G Xiang

Source: Other

Publication Type: Conference paper in refereed proceedings

DOI Link: DOI Link

Filter By
Publication Type