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DTSTART:20180325T030000
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DTSTART:20181028T020000
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DTSTAMP:20260406T000503Z
UID:59d4bf21eabf7501335775@ist.ac.at
DTSTART:20180925T110000
DTEND:20180925T123000
DESCRIPTION:Speaker: Constantin Schrade\nhosted by Georgios Katsaros\nAbstr
 act: Topological superconductors hosting spatially separated Majorana boun
 d states form a key component of robust quantum computing architectures. I
 n candidate platforms for topological superconductors\, such as semiconduc
 ting-superconducting hybrid nanowires\, the emergence of a zero-bias condu
 ctance peak has been perceived as a first step towards verifying the exist
 ence of Majorana bound states. However\, zero-bias conductance peak measur
 ements have difficulties in differentiating zero-energy Majorana bound sta
 tes from zero-energy Andreev bound states that can also appear in topologi
 cal superconductor candidate systems. Hence\, we need a more refined diagn
 ostic tool to differentiate Majorana bound states from Andreev bound state
 s.  In this talk\, I will address this issue by revisiting a well-establis
 hed superconducting circuit element: The Cooper pair transistor\; realizab
 le by a superconducting island in contact to superconducting leads. For a 
 trivial island\, the critical supercurrent between the leads exhibits a we
 ll-known 2e-periodicity in the island-gate charge. In contrast\, I will sh
 ow that for an island with spatially separated zero-energy Majorana or And
 reev bound states the periodicity of the magnitude of the critical supercu
 rrent transitions to 1e in the island-gate charge. Moreover\, I will argue
  that for Andreev bound states the current-phase relation displays a sign 
 reversal when the parity of the charge ground state of the island changes 
 between even and odd. Notably\, I will demonstrate that for Majorana bound
  states the same sign reversal does not occur.  Finally\, I will put these
  results into the context of Majorana qubits. More specifically\, I will d
 iscuss a Majorana-based qubit in an all-superconducting circuit\, a "Major
 ana Superconducting Qubit". I will demonstrate how universal quantum compu
 tation can be achieved in such a device and discuss advantages over conven
 tional superconducting qubits.  [1] C. Schrade and L. Fu\, Andreev or Majo
 rana\, Cooper finds out\, arXiv:1809.xxxxx[2] C. Schrade and L. Fu\, Major
 ana Superconducting Qubit\, arXiv:1803.01002[3] C. Schrade and L. Fu\, Par
 ity-controlled 2Pi Josephson effect mediated by Majorana Kramers pairs\, P
 hys. Rev. Lett. 120\, 267002 (2018).
LOCATION:Big Seminar room Ground floor / Office Bldg West (I21.EG.101)\, IS
 TA
ORGANIZER:jdeanton@ist.ac.at
SUMMARY:Constantin Schrade: Andreev or Majorana\, Cooper finds out
URL:https://talks-calendar.ista.ac.at/events/1404
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