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SUMMARY:C.H. Raymond Ooi
DTSTART:20240907T120000Z
DTEND:20240907T133000Z
DTSTAMP:20260423T022739Z
UID:QOART/32
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/QOART/32/">C
 orrelated Raman photon pairs and finite-temperature quantum memory</a>\nby
  C.H. Raymond Ooi as part of Quantum Optics and Related Topics\n\n\nAbstra
 ct\nQuantum communication technology would need a reliable quantum system 
 for quantum information storage. Many studies of optical quantum memory in
 volve the Raman scheme for writing and reading of optical pulses and singl
 e photons that carry quantum information. Optical quantum memory is an ess
 ential component in quantum information technology\, particularly for secu
 re long-distance quantum communication networks. Many quantum memory schem
 es have been proposed and demonstrated experimentally but there are limita
 tions\, especially with regard to practicality and scalability. We will di
 scuss our work towards room temperature quantum memory which has been rega
 rded as formidable due to the rapid decoherence and broadened absorption/e
 mission peaks. Counter-propagating laser schemes can be applied to achieve
  optimal performances by overcoming these problems. This would be a step f
 orward to realizing a practical quantum network.  \n\nWe will discuss the 
 use of Heisenberg-Langevin-Maxwell coupled equations to study quantum corr
 elations and relative squeezing of Raman photon pairs for forward and back
 ward propagating gemetries with arbitrary pump and control lasers using do
 uble Raman scheme. We generalized the quantum theory of stimulated Raman s
 cattering to study the spatial-temporal dynamics of photons during storage
  and retrieval stages of quantum memory with all dissipative mechanisms in
 cluded\, such as atomic motion\, collisions and radiation baths. We will d
 iscuss the effects of controllable laser pulses\, velocity distribution an
 d atomic initial conditions (like atomic frequency comb). Our study involv
 es numerical solutions of Heisenberg-Langevin-Maxwell coupled equations ge
 neralized analytical solutions that can be used to study the quantum memor
 y performance like storage time\, efficiency and the correlations between 
 storage and retrieval photons.\n
LOCATION:https://researchseminars.org/talk/QOART/32/
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