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SUMMARY:Spin-wave quantum memories for single photon storage and generatio
 n - Hugues de Riedmatten (ICFO)
DTSTART:20170515T143000Z
DTEND:20170515T160000Z
UID:TALK72674@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:Photonic quantum memories are important devices in quantum inf
 ormation science as they provide a quantum interface between flying and st
 ationary qubits.  The ability to store a quantum state of light enables th
 e synchronization of different probabilistic quantum processes\, which in 
 turns allows the realization of scalable quantum networks and quantum repe
 aters. Ensemble of atoms provide an appealing platform for the implementat
 ion of photonic quantum memories\, as they allow strong light-matter coupl
 ing without the need of high-finesse cavities\, and ability to store quant
 um information in a multiplexed fashion. In atomic ensembles\, photons are
  mapped as collective spin excitation (spin-waves)\, which can store photo
 nic quantum information for long times and be efficiently converted back i
 nto single photons.  \nIn this talk\, I will describe various examples and
  applications of spin-waves quantum memories\, both in laser cooled atomic
  gases and in solid-state atomic ensembles. The first part of the talk wil
 l be devoted to spin-wave quantum memories in a solid-state environment\, 
 based on Praseodymium doped crystals. Recent results include the demonstra
 tion of quantum correlations between a telecom photon a multimode spin-wav
 e solid-state quantum memory. The second part will describe the realizatio
 n of a photon pair source with embedded quantum memory\, using spontaneous
  Raman scattering in ensembles of atoms. Experiments demonstrating the gen
 eration of narrowband and synchronizable single photons with highly tuneab
 le wave shape from a cold atomic ensemble of Rubidium atoms will be descri
 bed. This source enabled the mapping of single photons into highly excited
  Rydberg states in a second ensemble\, a first step towards a strong inter
 action between two single photons. Finally\, the first demonstration of a 
 solid-state photon pair source with embedded multimode memory will be pres
 ented\n
LOCATION:Ryle Seminar Room (930) 
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