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arXiv · 2206.07607

Preserving Entanglement in a Solid-Spin System Using Quantum Autoencoders

Feifei Zhou·Yu Tian·Yumeng Song·Chudan Qiu·Xiangyu Wang·Mingti Zhou·Bing Chen·Nanyang Xu·Dawei Lu
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Abstract

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 {\mu}s 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.

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Feifei Zhou, Yu Tian, Yumeng Song, Chudan Qiu, Xiangyu Wang, Mingti Zhou, Bing Chen, Nanyang Xu, Dawei Lu. 2022-06-15. Preserving Entanglement in a Solid-Spin System Using Quantum Autoencoders. https://doi.org/10.1063/5.0120060

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