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Imam Usmani, Christoph Clausen, Félix Bussières, Björn Lauritzen, Nuala Timoney,

- Quantum Storage of Photonic Entanglement in Nd:Y 2 SiO 5 - Towards a complete AFC quantum memory in Eu:Y 2 SiO 5. Imam Usmani, Christoph Clausen, Félix Bussières, Björn Lauritzen, Nuala Timoney, Mikael Afzelius, Hugues de Riedmatten, Nicolas Sangouard, Nicolas Gisin

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Imam Usmani, Christoph Clausen, Félix Bussières, Björn Lauritzen, Nuala Timoney,

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  1. - Quantum Storage of Photonic Entanglement in Nd:Y2SiO5- Towards a complete AFC quantum memory in Eu:Y2SiO5 Imam Usmani, Christoph Clausen, Félix Bussières, Björn Lauritzen, Nuala Timoney, Mikael Afzelius, Hugues de Riedmatten, Nicolas Sangouard, Nicolas Gisin Group of Applied Physics, University of Geneva - Switzerland

  2. But too few modes stored in Pr:Y2SiO5 …. Motivation:Succesful demonstration of complete AFC memory in Pr:Y2SiO5 Solution in Eu:Y2SiO5 (?)

  3. Eu3+:Y2SiO5 basics 580 nm • - Excited state life time 2 ms • Homogeneous line width 250 Hz (T=2 K, B=0) • Max. absorption coefficient 3-4 cm-1 • Spin coherence time 15 ms for 151Eu (B=0) 153Eu 5/2 260 MHz 5D0 Inhomogeneous absorption spectrum (10 ppm 153Eu) 3/2 194 MHz 1/2 700 MHz d=1.3 1/2 90 MHz 7F0 3/2 119 MHz 5/2

  4. The 580 nm source Another advantage – nice colour for photos…

  5. Spectroscopy

  6. Our choice of wavelengths 5/2 260 MHz 5D0 3/2 194 MHz 1/2 1/2 90 MHz 7F0 3/2 119 MHz 5/2 Relative transition strengths Branching ratio measurements: etc…

  7. Two-level AFC echo Comb prepared on the 3/2-3/2 transition AFC-echo 2% Efficiency

  8. … has a limited lifetime

  9. Rabi freq = 600-700 kHz Rabi frequency measurements Rabi frequency measurement on the 3/2-3/2 transition Rabi pulse

  10. On 5/2-3/2 transition a π pulse takes 1.7 microseconds

  11. AFC with spin wave storage in Eu:YSO 14% of the pulse area of the two level echo recovered

  12. … inhomogeneous spin lifetime

  13. Conclusion of second part • Solid-state 580 nm laser source, 110 mW maximum power so far… • Branching ratios between the 9 transitions measured, 3 transitions chosen for experiments • Two-level AFC echo, albeit low efficiency (~2 %) so far, more highly doped crystals needed (multipass?,cavity?) • Spin wave storage with bright input pulses. • Measure the inhomogeneous spin linewidth of Eu:Y2SiO5 at 36 kHz Outlook: complete AFC storage in Eu:Y2SiO5 at single photon level

  14. Nd experiments Imam Usmani (PhD) Christoph Clausen(PhD) Félix Bussières (post-doc) Eu experiments Björn Lauritzen (post-doc) Nuala Timoney (post-doc) Mikael Afzelius, Hugues de Riedmatten Nicolas Sangouard, Nicolas Gisin Thank you!

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