RQC Seminar

187th RQC Seminar

• Speaker

  Prof. Andrei Faraon
  ( William L. Valentine Professor of Applied Physics and Electric Engineering, California Institute of Technology )

• Date

  11:00-12:00 (11:00 a.m. - 12:00 p.m.), March 27, 2025 (Thursday)

• Venue

  Hybrid(ZOOM・ Room S507 at Wako Chem. & Mat.Phys. Bldg. / 物質科学研究棟 S507 (S51))）

• Title

  Quantum Science and Technology with Rare Earth Ions and Nano-Photonics

• Inquiries

  yasunobu.nakamura[at]riken.jp

Abstract
Rare earth ions doped in solids are highly versatile optically addressable spin qubits with long optical and spin coherence. In this talk I give an overview of our latest progress utilizing both single and ensembles of rare earths to advance quantum science and technology. At low doping concertation, single ions coupled to nano-photonic resonators are well suited for establishing remote entanglement in optical quantum networks. At the same time, they couple to other nuclear spins in the environment which can be harnessed for local quantum storage and processing as needed for quantum repeater network nodes, and to explore highly entangled spin states. At high doping concertation, dense ensembles of rare earth ions can be used to mediate microwave to optical transduction and to explore exotic quantum interactions. I discuss recent results on frequency multiplexed entanglement distribution in optical quantum networks, efficient microwave to optical transduction at single photon level, and quantum many body physics with electron and nuclear spins. We explored these research directions mainly with ytterbium 171 in yttrium orthovanadate.

References:
[1] Andrei Ruskuc, Chun-Ju Wu, Emanuel Green, Sophie L. N. Hermans, Joonhee Choi, Andrei Faraon, Scalable Multipartite Entanglement of Remote Rare-earth Ion Qubits https://arxiv.org/abs/2402.16224 , accepted in Nature (2024)
[2] Tian Xie, Rikuto Fukumori, Jiahui Li, Andrei Faraon, Scalable microwave-to-optical transducers at single photon level with spins, https://arxiv.org/abs/2407.08879 , (2024)
[3] Mi Lei, Rikuto Fukumori, Chun-Ju Wu, Edwin Barnes, Sophia Economou, Joonhee Choi, Andrei Faraon, Quantum thermalization and Floquet engineering in a spin ensemble with a clock transition , https://www.arxiv.org/abs/2408.00252 (2024)
[4] Andrei Ruskuc, Chun-Ju Wu, Jake Rochman, Joonhee Choi, Andrei Faraon, Nuclear spin-wave quantum register for a solid state qubit, Nature, 602, 408–413 (2022)
[5] Jonathan M. Kindem, Andrei Ruskuc, John G. Bartholomew, Jake Rochman, Yan Qi Huan, Andrei Faraon, Control and single-shot readout of an ion embedded in a nanophotonic cavity, Nature, 580, 201–204 (2020)
[6] Zhong et al, Nanophotonic rare-earth quantum memory with optically controlled retrieval, Science, Vol. 357, Issue 6358, pp. 1392-1395 (2017)
[7] Mi Lei, Rikuto Fukumori, Jake Rochman, Bihui Zhu, Manuel Endres, Joonhee Choi, Andrei Faraon, Many-body cavity quantum electrodynamics with driven inhomogeneous emitters, Nature volume 617, pages271–276 (2023)