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Juha Leppäkangas

Gruppe: Schön
Raum: 11.03
Tel.: +49 721 608-46030
Fax: +49 721 608-47040
juha leppaekangas2Zwc1∂kit edu

Institut für Theoretische Festkörperphysik
Karlsruher Institut für Technologie (Universität)
Wolfgang-Gaede-Str. 1
D-76128 Karlsruhe
Germany



2017

Regular Articles
Titel Autor Journal
Creating photon-number squeezed strong microwave fields by a Cooper-pair injection laser M. Koppenhöfer, J. Leppäkangas and M. Marthaler Phys. Rev. B 95, 134515 (2017)
Recovering the ideal results of a perturbed analog quantum simulator I. Schwenk, J.M. Reiner, S. Zanker, L. Tian, J. Leppäkangas and M. Marthaler arXiv:1701.02683 (2017)
Analyzing the spectral density of a perturbed analog quantum simulator using Keldysh formalism S. Zanker, I. Schwenk, J.M. Reiner, J. Leppäkangas and M. Marthaler arXiv:1705.02325 (2017)

2016

Regular Articles
Titel Autor Journal
Correlated Cooper pair transport and microwave photon emission in the dynamical Coulomb blockade J. Leppäkangas, M. Fogelström, M. Marthaler and G. Johansson Phys. Rev. B 93, 014506 (2016)
Diagrammatic description of a quantum system coupled to strong noise M. Marthaler and J. Leppäkangas Phys. Rev. B 94, 144301 (2016)
Estimating the error of an analog quantum simulator by additional measurements I. Schwenk, S. Zanker, J.M. Reiner, J. Leppäkangas and M. Marthaler arXiv:1612.03767 (2016)
Multiplying microwave photons by inelastic Cooper-pair tunneling J. Leppäkangas, M. Marthaler, D. Hazra, S. Jebari, G. Johansson and M. Hofheinz arXiv:1612.07098 (2016)

2015

Regular Articles
Titel Autor Journal
Antibunched photons from inelastic Cooper-pair tunneling J. Leppäkangas, M. Fogelström, A. Grimm, M. Hofheinz, M. Marthaler and G. Johansson Phys. Rev. Lett. 115, 027004 (2015)

2014

Regular Articles
Titel Autor Journal
A multi-stable switchable metamaterial P. Jung, S. Butz, M. Marthaler, M.V. Fistul, J. Leppäkangas, V.P. Koshelets and A.V. Ustinov Nature Communications 5, 3730 (2014)
Input-output description of microwave radiation in the dynamical Coulomb blockade J. Leppäkangas, G. Johansson, M. Marthaler and M. Fogelström New J. Phys. 16, 015015 (2014)
Correlated transport through junction arrays in the small Josephson energy limit: incoherent Cooper-pairs and hot electrons J.H. Cole, J. Leppäkangas and M. Marthaler New J. Phys. 16, 063019 (2014)

2013

Regular Articles
Titel Autor Journal
Nonclassical photon pair production in a voltage-biased Josephson junction J. Leppäkangas, G. Johansson, M. Marthaler and M. Fogelström Phys. Rev. Lett. 110, 267004 (2013)

2012

Regular Articles
Titel Autor Journal
Fragility of flux qubits against quasiparticle tunneling J. Leppäkangas and M. Marthaler Phys. Rev. B 85, 144503 (2012)
Conference Proceedings (contributed)
Titel Autor Journal
Sub-Poissonian photon statistics in a strongly coupled single-qubit laser M. Marthaler, P.Q. Jin, J. Leppäkangas and G. Schön J. Phys.: Conf. Ser. 400, 022068 (2012)

2011

Regular Articles
Titel Autor Journal
Charge transport through ultrasmall single and double Josephson junctions coupled to resonant modes of the electromagnetic environment Y.A. Pashkin, H. Im, J. Leppäkangas, T.F. Li, O. Astafiev, A.A. Abdumalikov Jr., E. Thuneberg and J.S. Tsai Phys. Rev. B (R) 83, 020502 (2011)
Circuit-QED analogue of a single-atom injection maser: Lasing, trapping states and multistability M. Marthaler, J. Leppäkangas and J.H. Cole Phys. Rev. B 83, 180505(R) (2011)
Phase-dependent quasiparticle tunneling in Josephson junctions: Measuring the cos-phi term with a superconducting charge qubit J. Leppäkangas, M. Marthaler and G. Schön Phys. Rev. B 84, 060505 (2011)