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4 October 2024 Single rare-earth ions coupled to a dense nuclear spin bath: a challenge and a resource
Sophie Hermans, Emanual Green, Erin Liu, Adrià Riera Moral, Andrei Ruskuc, Chun Ju Wu, Andrei Faraon
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Proceedings Volume PC13120, Quantum Nanophotonic Materials, Devices, and Systems 2024; PC1312002 (2024) https://doi.org/10.1117/12.3027759
Event: Nanoscience + Engineering, 2024, San Diego, California, United States
Abstract
Future quantum networks will enable unprecedented applications, ranging from secure communication to quantum-sensor networks. Qubits based on single rare-earth ions are promising candidates to act as nodes in such networks. We make use of single Yb3+ ions in YVO4, embedded in photonic crystal cavities. The vanadium (V) nuclear spins provide a dense nuclear spin bath, which can be used to store quantum states. Due to the Yb ions' orientation relative to neighboring V spins, control has been limited to next-nearest-neighbor spins. We work towards extending the resources for quantum state storage by the development of the nearest-neighbor spin control, enabled by an off-axis off-chip radiofrequency drive. Furthermore, we investigate what limits the qubit lifetime and coherence, using a crystal with a lowered concentration of Yb and paramagnetic defects. Additionally, we study the effect of an interacting spin bath using a cluster correlation expansion model. This work will enable the further exploration of sensing protocols in complex spin environments, the development of coherence preserving pulse sequences, and storage of quantum states in high-dimensional Hilbert spaces.
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Sophie Hermans, Emanual Green, Erin Liu, Adrià Riera Moral, Andrei Ruskuc, Chun Ju Wu, and Andrei Faraon "Single rare-earth ions coupled to a dense nuclear spin bath: a challenge and a resource", Proc. SPIE PC13120, Quantum Nanophotonic Materials, Devices, and Systems 2024, PC1312002 (4 October 2024); https://doi.org/10.1117/12.3027759
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KEYWORDS
Quantum spin
Ions
Quantum communications
Quantum resources
Quantum coherence
Ytterbium
Crystals
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