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SUMMARY:Splitting a single Cooper pair with microwave light - Dr Andrew Fe
 rguson (University of Cambridge)
DTSTART:20131111T153000Z
DTEND:20131111T170000Z
UID:TALK48132@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:Double quantum dots made from semiconductor nanowires and carb
 on nanotubes have previously enabled a supercurrent\, which is composed of
  Cooper pairs in a spin singlet state\, to be split into its two component
  electron currents.\nSuch a process\, known as Cooper pair splitting\, may
  be a route to quantum mechanical electrical circuits in which entanglemen
 t of the split electronic state plays a role. In contrast with these previ
 ous experiments which deal with large ensembles of split Cooper pairs\, we
  here demonstrate that in a superconducting aluminium double quantum dot i
 t is possible to observe splitting of a single Cooper pair and its subsequ
 ent recombination. We measure the spectrum of background microwave light r
 esponsible for the splitting and find it to be consistent with background 
 black‐body radiation. Furthermore\, we are able to apply external microw
 ave light and observe controlled Cooper pair splitting through the absorpt
 ion of a single microwave photon. The detection of single microwave photon
 s via single Cooper pair splitting may have application in the circuit qua
 ntum electrodynamics paradigm of quantum computing. \n\nN. J. Lambert et a
 l. arXiv:1304.5117\n
LOCATION:Rutherford building\, Seminar Room B
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