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SUMMARY:Recent progress at Quantum Computing and Devices Laboratories - Pr
 of Mikko Möttönen
DTSTART:20160519T130000Z
DTEND:20160519T140000Z
UID:TALK65282@talks.cam.ac.uk
CONTACT:Alessandro Rossi
DESCRIPTION:In this talk\, I outline the on-going projects and recent resu
 lts from QCD Labs. I begin with a brief overview of our demonstrations of 
 magnetic-monopole analogues [1\,2] and quantum-mechanical knots [3] in sup
 erfluids. Subsequently\, I focus on our development of engineered environm
 ents for quantum-mechanically behaving superconducting circuits. In this c
 ontext\, I present our recent results on quantum-limited heat conduction o
 ver macroscopic distances [4] and the quantum circuit refrigerator. In the
  future\, we aim to develop these concepts into in-situ-tunable components
  that can be use to conveniently cool down quantum devices at will. Such c
 omponents can potentially be applied in the initialization of quantum regi
 sters in a quantum computer and in the enhancement quantum annealers. Fina
 lly\, I introduce a thermal detector for propagating microwave photons [5]
  and demonstrate that it can distinguish between single zeptojoule microwa
 ve pulses using electrothermal feedback [6]. To our knowledge\, this is an
  order-of-magnitude improvement over previous thermal detectors.\n\n\n[1] 
 M. Ray et al.\, Nature 505\, 657 (2014).\n[2] M. Ray et al.\, Science 348\
 , 544 (2015).\n[3] D. S. Hall et al.\, Nature Phys. doi:10.1038/nphys3624 
 (2016).\n[4] M. Partanen et al. Nature Phys. doi:10.1038/nphys3642 (2016).
 \n[5] J. Govenius et al. Phys. Rev. B 90\, 064505 (2014).\n[6] J. Govenius
  et al. arXiv:1512.07235 (2015).\n
LOCATION:MRC seminar room - Cavendish Laboratory
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