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BEGIN:VEVENT
SUMMARY:Rare Earth Doped Crystals for  Optical Quantum Memories
DTSTART:20131114T163000
DTEND:20131114T173000
DTSTAMP:20260928T192435Z
UID:79ef792920df94d14b1c5ad62fc9be735ffc8ba238f0c095816633a5
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Philippe Goldner\nChimie Paristech\, CNRS\, Université Pie
 rre et Marie Curie\,\nLaboratoire de Chimie de la Matière Condensée de P
 aris\,\n11 rue Pierre et Marie Curie\, 75005 Paris\, France\nQuantum infor
 mation uses the superposition states of light or matter to perform new dat
 a processing or transmission tasks\, which are impossible to obtain with c
 lassical states. Applications include quantum computing\, which could dram
 atically speed up some calculations and optical quantum memories\, devices
  able to store and release faithfully photonic quantum states. The latter 
 could be used to extend the range of quantum cryptography\, which allows o
 ne to transmit information with an unprecedented security and is commercia
 lly available. Although striking results have been obtained in atomic vapo
 rs and cold atomic clouds\, solid state systems present the advantage of s
 tability and simple cooling since low temperatures are needed in most case
 s. They also offer the opportunity to develop specific and highly efficien
 t processing protocols. Rare earth doped crystals have recently been consi
 dered for these applications because of their long optical and hyperfine c
 oherence lifetimes.\nIn this talk\, we will present properties that crysta
 ls have to fulfill for quantum memories\, with an emphasis on level struct
 ures\, homogeneous and inhomogeneous linewidths. Recent results obtained i
 n our group on storage time extension1-3 will then be discussed.\n[1] M. L
 ovrić\, D. Suter\, A. Ferrier\, and P. Goldner\, “Faithful Solid State 
 Optical Memory with Dynamically Decoupled Spin Wave Storage\,” Phys. Rev
 . Lett.\, 111 (2013) 020503.\n[2] F. Beaudoux\, O. Guillot-Noël\, J. Leja
 y\, A. Ferrier\, and P. Goldner\, "Concentration dependence of absorption 
 and optical and hyperfine transition dynamics in Pr3+:La2(WO4)3\," J. Phys
 . B: At. Mol. Opt. Phys.\, 45 (2012) 124014. Special issue on quantum memo
 ries.\n[3] M. Lovric\, P. Glasenapp\, D. Suter\, B. Tumino\, P. Goldner\, 
 M. Sabooni\, L. Rippe\, and S. Kröll\, "Hyperfine characterization and sp
 in coherence lifetime extension in Pr3+:La2(WO4) 3\," Phys. Rev. B\, 84 (2
 011) 104417.
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
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