Preserving entanglement in a solid-spin system using quantum autoencoders

Zhou，Feifei1; Tian，Yu2; Song，Yumeng3; Qiu，Chudan2; Wang，Xiangyu2; Zhou，Mingti1; Chen，Bing3; Xu，Nanyang1; Lu，Dawei2

2022-09-26

10.1063/5.0120060

APPLIED PHYSICS LETTERS   Impact Factor & Quartile

0003-6951

1077-3118

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 ± 0.43 μs to 3.03 ± 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.

SCI

English

NI Journal Papers

Corresponding

National Key Research and Development Program of China["2018YFA0306600","2019YFA0308100","2020YFA0309400"] ; National Natural Science Foundation of China["12075110","11975117","11905099","11875159"] ; Guangdong International Collaboration Program[2020A0505100001] ; Science, Technology and Innovation Commission of Shenzhen Municipality["KQTD20190929173815000","JCYJ20200109140803865"] ; Guangdong Innovative and Entrepreneurial Research Team Program[2019ZT08C044] ; Guangdong Provincial Key Laboratory[2019B121203002] ; Major Scientific Project[2019MB0AE03] ; Research Initiation Project of Zhejiang Laboratory[K2022MB0PI02]

Physics

Physics, Applied

WOS:000864460600007

AIP Publishing

PHYSICS

2-s2.0-85139175030

Scopus

1.Research Center for Quantum Sensing,Zhejiang Lab,Hangzhou,311000,China
2.Shenzhen Institute for Quantum Science and Engineering,Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
3.School of Physics,Hefei University of Technology,Hefei,Anhui,230009,China

Zhou，Feifei,Tian，Yu,Song，Yumeng,et al. Preserving entanglement in a solid-spin system using quantum autoencoders[J]. APPLIED PHYSICS LETTERS,2022,121(13).

Zhou，Feifei.,Tian，Yu.,Song，Yumeng.,Qiu，Chudan.,Wang，Xiangyu.,...&Lu，Dawei.(2022).Preserving entanglement in a solid-spin system using quantum autoencoders.APPLIED PHYSICS LETTERS,121(13).

Zhou，Feifei,et al."Preserving entanglement in a solid-spin system using quantum autoencoders".APPLIED PHYSICS LETTERS 121.13(2022).