An elementary algorithm of quantum phase estimation based on the modified Kitaev algorithm is implemented on two qubits of an IBM quantum processor. This algorithm includes adiabatic preparation of the initial state, controlled phase shift with allowance for the results of previous measurements of qubit states, and single measurement of the qubit quantum state in order to obtain each significant bit of the measured phase. Classical error correction is applied to determine the correct sequence of bits, which makes it possible to eliminate the influence of limited accuracy of two-qubit gates.

中文翻译：

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IBM 量子处理器上的迭代量子相位估计

基于改进的 Kitaev 算法的量子相位估计基本算法在 IBM 量子处理器的两个量子位上实现。该算法包括初始状态的绝热准备、考虑到先前量子位状态测量结果的受控相移，以及量子位量子状态的单次测量以获得测量相位的每个有效位。应用经典的纠错来确定正确的位序列，这使得消除双量子位门精度有限的影响成为可能。