Optical storage for 0.53 seconds in a solid-state atomic frequency comb memory using dynamical decoupling
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Optical storage for 0.53 seconds in a solid-state atomic frequency comb memory using dynamical decoupling. / Holzäpfel, Adrian; Etesse, Jean; Kaczmarek, Krzysztof T.; Tiranov, Alexey; Gisin, Nicolas; Afzelius, Mikael.
In: New J. Phys., 17.10.2019.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Optical storage for 0.53 seconds in a solid-state atomic frequency comb memory using dynamical decoupling
AU - Holzäpfel, Adrian
AU - Etesse, Jean
AU - Kaczmarek, Krzysztof T.
AU - Tiranov, Alexey
AU - Gisin, Nicolas
AU - Afzelius, Mikael
PY - 2019/10/17
Y1 - 2019/10/17
N2 - Quantum memories with long storage times are key elements in long-distance quantum networks. The atomic frequency comb (AFC) memory in particular has shown great promise to fulfill this role, having demonstrated multimode capacity and spin-photon quantum correlations. However, the memory storage times have so-far been limited to about one millisecond, realized in a Eu${}^{3+}$ doped Y${}_2$SiO${}_5$ crystal at zero applied magnetic field. Motivated by studies showing increased spin coherence times under applied magnetic field, we developed a AFC spin-wave memory utilizing a weak 15 mT magnetic field in a specific direction that allows efficient optical and spin manipulation for AFC memory operations. With this field configuration the AFC spin-wave storage time increased to 40 ms using a simple spin-echo sequence. Furthermore, by applying dynamical decoupling techniques the spin-wave coherence time reaches 530 ms, a 300-fold increase with respect to previous AFC spin-wave storage experiments. This result paves the way towards long duration storage of quantum information in solid-state ensemble memories.
AB - Quantum memories with long storage times are key elements in long-distance quantum networks. The atomic frequency comb (AFC) memory in particular has shown great promise to fulfill this role, having demonstrated multimode capacity and spin-photon quantum correlations. However, the memory storage times have so-far been limited to about one millisecond, realized in a Eu${}^{3+}$ doped Y${}_2$SiO${}_5$ crystal at zero applied magnetic field. Motivated by studies showing increased spin coherence times under applied magnetic field, we developed a AFC spin-wave memory utilizing a weak 15 mT magnetic field in a specific direction that allows efficient optical and spin manipulation for AFC memory operations. With this field configuration the AFC spin-wave storage time increased to 40 ms using a simple spin-echo sequence. Furthermore, by applying dynamical decoupling techniques the spin-wave coherence time reaches 530 ms, a 300-fold increase with respect to previous AFC spin-wave storage experiments. This result paves the way towards long duration storage of quantum information in solid-state ensemble memories.
KW - quant-ph
U2 - 10.1088/1367-2630/ab8aac
DO - 10.1088/1367-2630/ab8aac
M3 - Journal article
JO - New J. Phys.
JF - New J. Phys.
ER -
ID: 313514785