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Tm 3+ Tm 3+ : Y3Ga5O12 materials for spectrally multiplexed quantum memories
C W Thiel1, N Sinclair2, W Tittel2
1Department of Physics, Montana State University, Bozeman, Montana 59717, USA.
Physical Review Letters
|November 1, 2014
Summary
We found a new crystal, Tm3+:Y3Ga5O12, with excellent properties for building quantum memories. Its long coherence lifetimes and broad bandwidth are ideal for quantum repeaters.
Area of Science:
- Quantum Information Science
- Solid-State Spectroscopy
- Materials Science
Background:
- Optical quantum memories are crucial for quantum communication networks.
- Persistent spectral tailoring enables narrow absorption features for quantum memory applications.
Purpose of the Study:
- To investigate the spectroscopic properties of the 795 nm (3)H(6)↔(3)H(4) transition in Tm3+:Y3Ga5O12 at low temperatures.
- To assess the material's suitability for broadband optical quantum memories and quantum repeaters.
Main Methods:
- Spectroscopic measurements at temperatures as low as 1.2 K.
- Analysis of coherence properties, hyperfine structure, and population/coherence lifetimes.
Main Results:
- Uniform coherence properties over a 56 GHz bandwidth.
- Hyperfine structure split by ± 44 MHz/T with lifetimes up to hours.
- A (3)F(4) population lifetime of 64 ms and a coherence lifetime of 490 μs for Tm3+ ions.
Conclusions:
- Tm3+:Y3Ga5O12 exhibits exceptionally long coherence lifetimes and broad bandwidth, making it a promising material for quantum memories.
- The material's properties support the realization of spectrally multiplexed quantum repeaters.
