Optical clock transition in a rare-earth-ion-doped crystal: coherence lifetime extension for quantum storage applications

Tongning, Robert-Christopher; Chanelière, Thierry; Gouët, J.-L. Le; Pascual-Winter, M. F.

doi:10.1088/1742-6596/605/1/012037

Cited by 5 publications

(6 citation statements)

References 18 publications

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“…( 2), which describe the linear Zeeman shift, we find that there exist ground and excited state pairs of hyperfine states for which the optical transition frequency decreases with applied magnetic field. Hence, for certain combinations of crystal orientation (or rather orientation of a local Tm 3+ site) with respect to the magnetic field, magnetic field strength and spin values, the linear and quadratic Zeeman effects oppose each other, and an optical clock transition can be observed [33]. This transition must have a field magnitude insensitive point, which is shown in Fig.…”

Section: Optical Clock Transitions and Special Directionsmentioning

confidence: 98%

Measurement of the thulium ion spin Hamiltonian in an yttrium gallium garnet host crystal

et al. 2021

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We characterize the magnetic properties for thulium ion energy levels in the Y 3 Ga 5 O 12 (Tm:YGG) lattice with the goal to improve decoherence and reduce linewidth broadening caused by local host spins and crystal imperfections. More precisely, we measure hyperfine tensors for the lowest level of 3 H6 and excited 3 H4 states using a combination of spectral hole burning, absorption spectroscopy, and optically detected nuclear magnetic resonance. By rotating the sample through a series of angles with an applied external magnetic field, we measure and analyze the orientation dependence of the Tm 3+ ion's spin Hamiltonian. Using this spin Hamiltonian, we propose a set of orientations to improve material properties that are important for light-matter interaction and quantum information applications. Our results yield several important external field directions: some to extend optical coherence times, another to improve spin inhomogeneous broadening, and yet another that maximizes mixing of the spin states for specific sets of ions, which allows improving optical pumping and creation of lambda systems in this material.

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Section: Optical Clock Transitions and Special Directionsmentioning

confidence: 98%

Measurement of the thulium ion spin Hamiltonian in an yttrium gallium garnet host crystal

et al. 2021

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“…Therefore, it is possible to extract dephasing time T M and exponent x only outside these regions. Around 200mT for 0.005% crystal and 250mT for 0.0013% crystal the magnetic field dependence of T M (B) shows a typical peak feature associated with reduced sensitivity of optical transition frequency to the local magnetic field fluctuations δB in vicinity of the CT [37]. In order to get insight into dynamical processes of electronic and nuclear spin baths, we determine dependence of δB on applied field and temperature from the measured dephasing time.…”

Section: Coherent Optical Spectroscopymentioning

confidence: 99%

Optical coherence of¹⁶⁶Er:⁷LiYF₄crystal below 1 K

et al. 2018

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We explore optical coherence and spin dynamics of an isotopically purified 166 Er: 7 LiYF 4 crystal below 1 K and at weak magnetic fields < 0.3T. Crystals were grown in our lab and demonstrate narrow inhomogeneous optical broadening down to 16MHz. Solid-state atomic ensembles with such narrow linewidths are very attractive for implementing of off-resonant Raman quantum memory and for the interfacing of superconducting quantum circuits and telecom C-band optical photons. Both applications require a low magnetic field of ∼10mT. However, at conventional experimental temperatures T>1.5K, optical coherence of Er:LYF crystal attains m 10 s time scale only at strong magnetic fields above 1.5 T. In the present work, we demonstrate that the deep freezing of Er:LYF crystal below 1 K results in the increase of optical coherence time to m 100 s at weak fields.

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“…To increase the memory performance to a level that allows its use in a quantum network, several improvements, most, if not all of which are of technical nature, are required. As we describe in more detail in Supplemental Material [15], this includes using a frequency-stabilized laser with narrower linewidth [54,55], a cryostat with reduced vibrations [56], a more stable magnetic field as well as finding parameters (propagation direction and polarization of the light [57], and external magnetic field) under which spectral diffusion due to ionion interactions [58] is reduced and the 3 H 6 ↔ 3 H 4 transition becomes a so-called clock transition [37,[59][60][61][62]. Furthermore, to counter the effects of limited optical depth, the light-atom interaction has to be enhanced using an impedance-matched cavity [33,[63][64][65][66].…”

mentioning

confidence: 99%

Long-Lived Solid-State Optical Memory for High-Rate Quantum Repeaters

et al. 2021

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We argue that long optical storage times are required to establish entanglement at high rates over large distances using memory-based quantum repeaters. Triggered by this conclusion, we investigate the 795.325 nm 3 H 6 ↔ 3 H 4 transition of Tm∶Y 3 Ga 5 O 12 (Tm:YGG). Most importantly, we find that the optical coherence time can reach 1.1 ms, and, using laser pulses, we demonstrate optical storage based on the atomic frequency comb protocol during up to 100 μs as well as a memory decay time T m of 13.1 μs. Possibilities of how to narrow the gap between the measured value of T m and its maximum of 275 μs are discussed. In addition, we demonstrate multiplexed storage, including with feed-forward selection, shifting and filtering of spectral modes, as well as quantum state storage using members of nonclassical photon pairs. Our results show the potential of Tm:YGG for creating multiplexed quantum memories with long optical storage times, and open the path to repeater-based quantum networks with high entanglement distribution rates.

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Optical clock transition in a rare-earth-ion-doped crystal: coherence lifetime extension for quantum storage applications

Cited by 5 publications

References 18 publications

Measurement of the thulium ion spin Hamiltonian in an yttrium gallium garnet host crystal

Measurement of the thulium ion spin Hamiltonian in an yttrium gallium garnet host crystal

Optical coherence of¹⁶⁶Er:⁷LiYF₄crystal below 1 K

Long-Lived Solid-State Optical Memory for High-Rate Quantum Repeaters

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Optical clock transition in a rare-earth-ion-doped crystal: coherence lifetime extension for quantum storage applications

Cited by 5 publications

References 18 publications

Measurement of the thulium ion spin Hamiltonian in an yttrium gallium garnet host crystal

Measurement of the thulium ion spin Hamiltonian in an yttrium gallium garnet host crystal

Optical coherence of166Er:7LiYF4crystal below 1 K

Long-Lived Solid-State Optical Memory for High-Rate Quantum Repeaters

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Optical coherence of¹⁶⁶Er:⁷LiYF₄crystal below 1 K