Implementing efficient selective quantum process tomography of superconducting quantum gates on the IBM quantum processor

• URL: http://arxiv.org/abs/2107.07462v1
• Date: Thu, 15 Jul 2021 17:04:24 GMT
• Title: Implementing efficient selective quantum process tomography of superconducting quantum gates on the IBM quantum processor
• Authors: Akshay Gaikwad and Krishna Shende and Arvind and Kavita Dorai
• Abstract summary: Experimental implementation of selective quantum process tomography (SQPT) involves computing individual elements of a process matrix with the help of a special set of states called quantum 2-design states. We mathematically reformulated the standard SQPT problem, which we term the modified SQPT (MSQPT) method. We designed the generalized quantum circuit to prepare the required set of input states and formulated an efficient measurement strategy aimed at minimizing the experimental cost of SQPT.
• Score: 3.818504253546488
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The experimental implementation of selective quantum process tomography (SQPT) involves computing individual elements of the process matrix with the help of a special set of states called quantum 2-design states. However, the number of experimental settings required to prepare input states from quantum 2-design states to selectively and precisely compute a desired element of the process matrix is still high, and hence constructing the corresponding unitary operations in the lab is a daunting task. In order to reduce the experimental complexity, we mathematically reformulated the standard SQPT problem, which we term the modified SQPT (MSQPT) method. We designed the generalized quantum circuit to prepare the required set of input states and formulated an efficient measurement strategy aimed at minimizing the experimental cost of SQPT. We experimentally demonstrated the MSQPT protocol on the IBM QX2 cloud quantum processor and selectively characterized various two- and three-qubit quantum gates.

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