A scheme for measuring the state of a charge qubit on a semiconductor single-electron double quantum dot (DQD) coupled to a photonic molecule (PM) consisting of three optical microresonators is proposed. The DQD that is the qubit plays the role of a nonlinear element whose electron state affects a PM response to an external laser field. Analysis of the spectroscopic response of the structure in the steady-state regime allows one to determine the state of the qubit. As an example, the spectrum of the PM formed by three GaAs microdisk resonators are calculated. The effect of various system parameters on the measuring contrast and the signal-to-noise ratio is studied. It is shown that this ratio can reach values of 15 000–20 000 for certain sets of parameters.

提出了一种用于测量耦合到由三个光学微谐振器组成的光子分子 (PM) 的半导体单电子双量子点 (DQD) 上电荷量子位状态的方案。作为量子位的 DQD 扮演非线性元件的角色，其电子状态会影响 PM 对外部激光场的响应。对稳态状态下结构的光谱响应进行分析可以确定量子位的状态。作为一个例子，计算了由三个 GaAs 微盘谐振器形成的 PM 的光谱。研究了各种系统参数对测量对比度和信噪比的影响。结果表明，对于某些参数集，该比率可以达到 15 000–20 000 的值。