Dual rare-earth qubits and correlated long-lived coherence in epitaxial thin-film crystals

Tian Zhong

doi:10.1117/12.3014168

10 June 2024 Dual rare-earth qubits and correlated long-lived coherence in epitaxial thin-film crystals

Tian Zhong

Proceedings Volume PC13028, Quantum Information Science, Sensing, and Computation XVI; PC1302804 (2024) https://doi.org/10.1117/12.3014168
Event: SPIE Defense + Commercial Sensing, 2024, National Harbor, Maryland, United States

Abstract

We report dual er qubits in two distinct symmetry sites of an epitaxially grown single crystal Y2O3 thin film. Coupling of Er spins to a superconducting microwave resonator and a fiber micro-cavity enables simultaneous optical-spin coherence spectroscopy at millikelvin temperature. At optimal field orientations, over millisecond spin coherence times are observed for Er qubits in both C2 and C3i symmetry sites. Single Er ions in both C2 and C3i sites are addressed optically, respectively at the field configuration where their millisecond spin coherence times are measured. By correlating the spin spectral diffusion and optical dephasing rate of C3i Er qubits, we report a magnetic noise limited spin-optical dephasing rate of only 2.6 kHz, demonstrating significant prospect of Er in epitaxial Y2O3 thin film as a highly coherent spin-photon interface for quantum network.

Conference Presentation

Citation Download Citation

Tian Zhong "Dual rare-earth qubits and correlated long-lived coherence in epitaxial thin-film crystals", Proc. SPIE PC13028, Quantum Information Science, Sensing, and Computation XVI, PC1302804 (10 June 2024); https://doi.org/10.1117/12.3014168

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