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SUMMARY:Coherence-assisted single-shot cooling by quantum absorption refri
 gerators - Mark Mitchison (Imperial College)
DTSTART:20151217T160000Z
DTEND:20151217T170000Z
UID:TALK63015@talks.cam.ac.uk
CONTACT:William Matthews
DESCRIPTION:A quantum absorption refrigerator is a cooling machine powered
  only by incoherent thermal energy. The simplest such device is composed o
 f three qubits\, one of which is the target to be cooled. I will discuss h
 ow quantum coherence in the three-qubit refrigerator enables cooling of th
 e target qubit to temperatures lower than the steady state in a small amou
 nt of time. This potentially useful effect is due to the generic oscillati
 ons which appear in strongly coupled non-equilibrium quantum systems. I wi
 ll also show that a quantum absorption refrigerator can be realised using 
 a trapped ion in an optical cavity. We find that with realistic experiment
 al parameters the ion can be cooled almost to its motional ground state us
 ing only freely available thermal energy in the form of sunlight.\n
LOCATION:MR4\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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