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SUMMARY:Signal Flows in Non-Markovian Quantum Networks - Wu\, R-B (Tsinghu
 a University)
DTSTART:20140804T104500Z
DTEND:20140804T112500Z
UID:TALK53579@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:With rapid progresses in quantum technologies\, quantum device
 s will be possibly networked at a much larger scale in the near future\, o
 ver which effective analysis and synthesis are very demanding. In this pap
 er\, we construct signal flow graphs for linear quantum networks that are 
 more concise than the traditional block diagram representation. Starting f
 rom two interconnected linear quantum systems\, we present a bidirectional
  signal flow graph that describes the quantum action and backaction betwee
 n them. Such signal flow graph can be naturally applied to non-Markovian s
 ystems with colored quantum noise inputs\, and thus can include more gener
 al linear components such as spectral filters and dispersive quantum waveg
 uides. These components can be integrated to build complex feedback networ
 ks via interconnections or serial products\, where either direct or indire
 ct coherent feedback loops are envisioned as bidirectional flows of quantu
 m signals. Finally\, we introduce the Riegle 9\;s matrix gain rule to cal
 culate transfer functions between source and sink nodes in a linear quantu
 m network with multiple overlapping feedback loops. The theory provides a 
 basis for synthesizing non-Markovian linear quantum feedback networks in t
 he frequency-domain.\n
LOCATION:Seminar Room 1\, Newton Institute
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