Advanced

Detecting parity effect in a superconducting device in the presence of parity switches

Mannila, E. T. ; Maisi, V. F. LU ; Nguyen, H. Q. ; Marcus, C. M. and Pekola, J. P. (2019) In Physical Review B 100(2).
Abstract

We present a superconducting device showing a clear parity effect in the number of electrons, even when there is, on average, a single nonequilibrium quasiparticle present and the parity of the island switches due to quasiparticles tunneling in and out of the device at rates on the order of 100 Hz. We detect the switching by monitoring in real time the charge state of a superconducting island connected to normal leads by tunnel junctions. The quasiparticles are created by Cooper pairs breaking on the island at a rate of a few kilohertz. We demonstrate that the pair breaking is caused by the backaction of the single-electron transistor used as a charge detector. With sufficiently low probing currents, our superconducting island is free... (More)

We present a superconducting device showing a clear parity effect in the number of electrons, even when there is, on average, a single nonequilibrium quasiparticle present and the parity of the island switches due to quasiparticles tunneling in and out of the device at rates on the order of 100 Hz. We detect the switching by monitoring in real time the charge state of a superconducting island connected to normal leads by tunnel junctions. The quasiparticles are created by Cooper pairs breaking on the island at a rate of a few kilohertz. We demonstrate that the pair breaking is caused by the backaction of the single-electron transistor used as a charge detector. With sufficiently low probing currents, our superconducting island is free of quasiparticles 97% of the time.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
100
issue
2
article number
020502
publisher
American Physical Society
external identifiers
  • scopus:85073651430
ISSN
2469-9950
DOI
10.1103/PhysRevB.100.020502
language
English
LU publication?
yes
id
f2ee9ff0-9865-4f79-9cfc-1bc10f1e77f1
date added to LUP
2019-11-05 09:43:31
date last changed
2020-07-29 06:04:14
@article{f2ee9ff0-9865-4f79-9cfc-1bc10f1e77f1,
  abstract     = {<p>We present a superconducting device showing a clear parity effect in the number of electrons, even when there is, on average, a single nonequilibrium quasiparticle present and the parity of the island switches due to quasiparticles tunneling in and out of the device at rates on the order of 100 Hz. We detect the switching by monitoring in real time the charge state of a superconducting island connected to normal leads by tunnel junctions. The quasiparticles are created by Cooper pairs breaking on the island at a rate of a few kilohertz. We demonstrate that the pair breaking is caused by the backaction of the single-electron transistor used as a charge detector. With sufficiently low probing currents, our superconducting island is free of quasiparticles 97% of the time.</p>},
  author       = {Mannila, E. T. and Maisi, V. F. and Nguyen, H. Q. and Marcus, C. M. and Pekola, J. P.},
  issn         = {2469-9950},
  language     = {eng},
  number       = {2},
  publisher    = {American Physical Society},
  series       = {Physical Review B},
  title        = {Detecting parity effect in a superconducting device in the presence of parity switches},
  url          = {http://dx.doi.org/10.1103/PhysRevB.100.020502},
  doi          = {10.1103/PhysRevB.100.020502},
  volume       = {100},
  year         = {2019},
}