title: Tm 3+ Tm 3+ : Y3Ga5O12 materials for spectrally multiplexed quantum memories.
abstract: We investigate the relevant spectroscopic properties of the 795 nm (3)H(6)↔(3)H(4) transition in 1% Tm(3+):Y(3)Ga(5)O(12) at temperatures as low as 1.2 K for optical quantum memories based on persistent spectral tailoring of narrow absorption features. Our measurements reveal that this transition has uniform coherence properties over a 56 GHz bandwidth, and a simple hyperfine structure split by ± 44 MHz/T with lifetimes of up to hours. Furthermore, we find a (3)F(4) population lifetime of 64 ms-one of the longest lifetimes observed for an electronic level in a solid--and an exceptionally long coherence lifetime of 490 μs--the longest ever observed for optical transitions of Tm(3+) ions in a crystal. Our results suggest that this material allows realizing broadband quantum memories that enable spectrally multiplexed quantum repeaters.
authors.affiliation: Department of Physics, Montana State University, Bozeman, Montana 59717, USA.
authors.forename: C W
authors.initials: CW
authors.lastname: Thiel
authors.affiliation: Institute for Quantum Science and Technology, and Department of Physics & Astronomy, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
authors.forename: N
authors.initials: N
authors.lastname: Sinclair
authors.affiliation: Institute for Quantum Science and Technology, and Department of Physics & Astronomy, University of Calgary, Calgary, Alberta T2N 1N4, Canada.
authors.forename: W
authors.initials: W
authors.lastname: Tittel
authors.affiliation: Department of Physics, Montana State University, Bozeman, Montana 59717, USA.
authors.forename: R L
authors.initials: RL
authors.lastname: Cone