CNOT gate operation on a photogenerated molecular electron spin-qubit pair
CNOT gate operation on a photogenerated molecular electron spin-qubit pair
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DOI：
10.1063/1.5128132
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发表时间：
2020-01-07
影响因子：
4.4
通讯作者：
Wasielewski, Michael R.
中科院分区：
文献类型：
--
作者：
Nelson, Jordan N.;Zhang, Jinyuan;Wasielewski, Michael R.
实现双量子比特的受控非门（CNOT）是开发一套完整的量子计算通用门的必要条件。在这里，我们证明了共价供体-发色团-受体分子内的光生自由基（自旋量子比特）对可以用于成功地执行具有高保真度的CNOT门。给体为四硫富瓦烯（TTF），发色团为8-氨基萘-1，8-二甲酰亚胺（ANI），受体为均苯四甲酸酰亚胺（PI）.用416 nm激光脉冲选择性光激发ANI导致在85 K下具有1.8 μ s相位记忆时间的TTF中心点+-ANI-PI中心点-自由基（自旋量子位）对的亚纳秒形成。这足够长以使用五个微波脉冲的序列执行CNOT门，随后是读出密度矩阵的所有元素的两个脉冲的序列。将这些数据与假设理想条件的数据模拟进行比较，得到CNOT门执行的保真度为0.97。这些结果表明，光生分子自旋量子比特对可以用于在适度的温度下执行这种必要的量子门，这提供了化学合成可以用于开发结构以使用电子自旋执行更复杂的量子逻辑操作的可能性。
Implementation of the two-qubit controlled-NOT (CNOT) gate is necessary to develop a complete set of universal gates for quantum computing. Here, we demonstrate that a photogenerated radical (spin qubit) pair within a covalent donor-chromophore-acceptor molecule can be used to successfully execute a CNOT gate with high fidelity. The donor is tetrathiafulvalene (TTF), the chromophore is 8-aminonaphthalene-1,8-dicarboximide (ANI), and the acceptor is pyromellitimide (PI). Selective photoexcitation of ANI with a 416 nm laser pulse results in subnanosecond formation of the TTF center dot+-ANI-PI center dot- radical (spin qubit) pair at 85 K having a 1.8 mu s phase memory time. This is sufficiently long to execute a CNOT gate using a sequence of five microwave pulses followed by a sequence of two pulses that read out all the elements of the density matrix. Comparing these data to a simulation of the data that assumes ideal conditions results in a fidelity of 0.97 for the execution of the CNOT gate. These results show that photogenerated molecular spin qubit pairs can be used to execute this essential quantum gate at modest temperatures, which affords the possibility that chemical synthesis can be used to develop structures to execute more complex quantum logic operations using electron spins.