Long-coherence pairing of low-mass conduction electrons in copper-substituted lead apatite

• URL: http://arxiv.org/abs/2310.17160v1
• Date: Thu, 26 Oct 2023 05:15:38 GMT
• Title: Long-coherence pairing of low-mass conduction electrons in copper-substituted lead apatite
• Authors: Jicheng Liu, Chenao He, Yin-Hui Peng, Zhihao Zhen, Guanhua Chen, Jia Wang, Xiao-Bao Yang, Xianfeng Qiao, Yao Yao, and Dongge Ma
• Abstract summary: Two entangled qubits emerge as an essential resource for quantum control, which are normally quantum confined with atomic precision. We report this exotic ensemble effect in solid-state sintering lead apatite samples with copper substitution. Experiments exhibit triplet Rabi oscillation from paired cuprate diradicals with the coherence time exceeding 1 microsecond at 85K.
• Score: 7.1599074009271355
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Two entangled qubits emerge as an essential resource for quantum control, which are normally quantum confined with atomic precision. It seems inhibitive that in the macroscopic scope collective qubit pairs manifest long coherence and quantum entanglement, especially at high temperature. Here, we report this exotic ensemble effect in solid-state sintering lead apatite samples with copper substitution, which have been repeatedly duplicated with superior stability and low cost. An extraordinarily low-field absorption signal of cw electron paramagnetic resonance (EPR) spectroscopy stems from low-mass conduction electrons implying the coherence of cuprate radicals can be long-termly protected. The pulsed EPR experiments exhibit triplet Rabi oscillation from paired cuprate diradicals with the coherence time exceeding 1 microsecond at 85K. We believe these appealing effects are sufficiently promising to be applied for scalable quantum control and computation.

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