Noise of a superconducting magnetic flux sensor based on a proximity Josephson junction

Autor: R. N. Jabdaraghi, D. S. Golubev, J. P. Pekola, J. T. Peltonen

Publikováno v: Scientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)

Abstract We demonstrate simultaneous measurements of DC transport properties and flux noise of a hybrid superconducting magnetometer based on the proximity effect (superconducting quantum interference proximity transistor, SQUIPT). The noise is probe

Externí odkaz: https://doaj.org/article/4690751532e04c0fb6e343efce4c85ad

Finite-time quantum Stirling heat engine

Autor: S Hamedani Raja, S Maniscalco, G S Paraoanu, J P Pekola, N Lo Gullo

Publikováno v: New Journal of Physics, Vol 23, Iss 3, p 033034 (2021)

We study the thermodynamic performance of a finite-time non-regenerative quantum Stirling-like cycle used as a heat engine. We consider specifically the case in which the working substance (WS) is a two-level system (TLS). The Stirling cycle is made

Externí odkaz: https://doaj.org/article/2d8ff2660ef7411eb3306b5abf657fa3

A superconductor free of quasiparticles for seconds

Autor: E. T. Mannila, P. Samuelsson, S. Simbierowicz, J. T. Peltonen, V. Vesterinen, L. Grönberg, J. Hassel, V. F. Maisi, J. P. Pekola

Publikováno v: Mannila, E T, Samuelsson, P, Simbierowicz, S, Peltonen, J T, Vesterinen, V, Grönberg, L, Hassel, J, Maisi, V F & Pekola, J P 2021, ' A superconductor free of quasiparticles for seconds ', Nature Physics, vol. 18, no. 2, pp. 145-148 . https://doi.org/10.1038/s41567-021-01433-7

Superconducting devices, based on the Cooper pairing of electrons, play an important role in existing and emergent technologies, ranging from radiation detectors to quantum computers. Their performance is limited by spurious quasiparticle excitations

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c0cc0352f37910cf3c391d08a9cc1d3e
https://cris.vtt.fi/en/publications/bf744c92-78a8-4434-a8c6-3afdb9d4b863

Nonlocality and dynamic response of Majorana states in fermionic superfluids

Autor: I M Khaymovich, J P Pekola, A S Melnikov

Publikováno v: New Journal of Physics, Vol 19, Iss 12, p 123026 (2017)

We suggest a microscopic model describing the nonlocal ac response of a pair of Majorana states in fermionic superfluids beyond the tunneling approximation. The time-dependent perturbations of quasiparticle transport are shown to excite finite period

Externí odkaz: https://doaj.org/article/c7bd3c079e634ffd980f8aade85d28d2

Calorimetric measurement of work in a quantum system

Autor: J P Pekola, P Solinas, A Shnirman, D V Averin

Publikováno v: New Journal of Physics, Vol 15, Iss 11, p 115006 (2013)

We propose a calorimetric measurement of work in a quantum system. As a physical realization, we consider a superconducting two-level system, a Cooper-pair box, driven by a gate voltage past an avoided level crossing at charge degeneracy. We demonstr

Externí odkaz: https://doaj.org/article/a6e5d710b19d49a4a82f874cca426375