Demonstration of Two-Qubit Algorithms in Superconducting Qubit System

Abstract

Quantum computing platforms are expected to outperform their classical counterparts in solving certain technical problems such as factorization and searching process. With remarkable progresses in the field, a lot of efforts and attentions are being made to experimentally demonstrate such supremacy of quantum computation. As a primitive attempt, we have implemented simple and well-known two-qubit algorithms in our superconducting qubit system. Our system consists of two transmon qubits, one of which is a frequency-tunable qubit, embedded in a single copper cavity forming a circuit QED system. The entangling gate that is essential for implementing quantum algorithms has been realized by utilizing MAP (microwaveactivated phase) gate. We evaluate the performance of two-qubit processor by estimating the fidelity of the entangling gate with two-qubit quantum process tomography (QPT). Then we demonstrate the implementation of two-qubit algorithms such as Deutsch-Josza algorithm and Grover search.