Advances in quantum information science (QIS) require the development of new molecular materials to serve as microwave addressable qubits that can be read out optically. Laser photoexcitation of organic π-conjugated molecules often results in spin-polarized phosphorescent triplet states that can be readily observed and manipulated using time-resolved electron paramagnetic resonance (EPR) techniques. Photoexcitation of N-mesityl-1,8-naphthalimide (M-NMI) and its phosphorus analogues, 2-mesitylbenzoisophosphinoline (M-BIPD) and 2-mesitylbenzoisophosphinoline oxide (M-BIPDO) results in ultrafast spin–orbit charge-transfer intersystem crossing to form the corresponding phosphorescent triplet states M-^3*NMI, M-^3*BIPD and M-^3*BIPDO. The ultrafast triplet formation dynamics, phosphorescence, and spin-polarized EPR spectra of these triplet states were examined. The most promising qubit candidate, M-^3*BIPD, was examined using pulse-EPR to measure its spin relaxation times, and pulse electron–nuclear double resonance spectroscopy to perform a two-qubit CNOT gate using the phosphorus nuclear spin.

中文翻译：

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自旋极化分子三重态作为量子位：苯并异膦酰基三重态中的磷超精细偶联。

量子信息科学（QIS）的进步要求开发新的分子材料以用作可微波读取的可光学读取的量子位。有机π共轭分子的激光光激发通常会导致自旋极化的磷光三重态，可以使用时间分辨电子顺磁共振（EPR）技术轻松观察和操作。的光激发ñ -基-1,8-萘二甲酰亚胺（M-NMI）和它的类似物的磷，2- mesitylbenzoisophosphinoline（M-BIPD）和2- mesitylbenzoisophosphinoline氧化物（M-BIPDO）导致超快自旋轨道电荷转移间跨越形成相应的磷光三重态M- ^{3 *}NMI，M- ^{3 *} BIPD和M- ^{3 *} BIPDO。检查了这些三重态的超快三重态形成动力学，磷光和自旋极化EPR光谱。使用脉冲EPR来测量最有前途的量子位候选者M- ^{3 *} BIPD，以测量其自旋弛豫时间，并使用磷核自旋，通过脉冲电子核双共振光谱法执行两个量子位的CNOT门。