论文标题
使用Quantum自动编码器保存在固相系统中的纠缠
Preserving Entanglement in a Solid-Spin System Using Quantum Autoencoders
论文作者
论文摘要
纠缠是现代量子技术的关键资源，由于腐烂而非常脆弱。在这里，我们表明，可以使用量子自动编码器将特定的量子纠缠状态压缩为具有稳固性的子空间的训练，该量子可用于保存纠缠。训练过程基于一种混合量子古典方法，以提高构建自动编码器的效率并减少优化过程中的实验误差。使用钻石中的氮 - 散布中心，我们证明了电子和核自旋之间的纠缠状态可以编码到核子空间中，该子空间的相干时间更长。结果，该固相系统中钟状态的寿命从2.22 {\ pm}0.43μs扩展到3.03 {\ pm} 0.56 ms，得出三个数量级的改善。量子自动编码器方法是通用的，铺平了将长终身核自旋作为量子信息任务中直接访问量子记忆的方式。
Entanglement, as a key resource for modern quantum technologies, is extremely fragile due to the decoherence. Here, we show that a quantum autoencoder, which is trained to compress a particular set of quantum entangled states into a subspace that is robust to decoherence, can be employed to preserve entanglement. The training process is based on a hybrid quantum-classical approach to improve the efficiency in building the autoencoder and reduce the experimental errors during the optimization. Using nitrogen-vacancy centers in diamond, we demonstrate that the entangled states between the electron and nuclear spins can be encoded into the nucleus subspace which has much longer coherence time. As a result, lifetime of the Bell states in this solid-spin system is extended from 2.22 {\pm} 0.43 μs to 3.03 {\pm} 0.56 ms, yielding a three orders of magnitude improvement. The quantum autoencoder approach is universal, paving the way of utilizing long lifetime nuclear spins as immediate-access quantum memories in quantum information tasks.
