Long-time storage of a decoherence-free subspace logical qubit in a dual-type quantum memory

• URL: http://arxiv.org/abs/2507.13320v1
• Date: Thu, 17 Jul 2025 17:40:22 GMT
• Title: Long-time storage of a decoherence-free subspace logical qubit in a dual-type quantum memory
• Authors: Y. L. Xu, L. Zhang, C. Zhang, Y. K. Wu, Y. Y. Chen, C. X. Huang, Z. B. Cui, R. Yao, W. Q. Lian, J. Y. Ma, W. X. Guo, B. X. Qi, P. Y. Hou, Y. F. Pu, Z. C. Zhou, L. He, L. M. Duan,
• Abstract summary: We report a multi-ion quantum memory in a cryogenic trap based on the dual-type scheme.<n>We demonstrate a coherence time above two hours for a logical qubit encoded in the decoherence-free subspace.
• Score: 0.19165511108619063
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A quantum memory is an essential element for quantum computation, quantum network and quantum metrology. Previously, a single-qubit quantum memory with a coherence time of about an hour has been realized in a dual-species setup where a coolant ion provides sympathetic cooling for a memory ion of different species. However, the frequent random position hopping between the ions in the room-temperature trap limits the technique there only applicable to single-qubit storage. Here we report a multi-ion quantum memory in a cryogenic trap based on the dual-type scheme, and demonstrate a coherence time above two hours for a logical qubit encoded in the decoherence-free subspace, i.e. two-ion entangled states, after correcting the dominant leakage error. Our scheme alleviates the necessity of an ultra-stable frequency reference for the stored qubit, and has a preferable scalability owing to the same mass of the metastable-state memory ions and the ground-state coolant ion.

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