54 citations · 221 across the 15 of their papers we have counts for
3 papers · 1 filter
Sub-Poissonian photon statistics in a strongly coupled single-qubit laser
M. Marthaler, Pei-Qing Jin, Juha Leppäkangas +1
We investigate qubit lasing in the strong coupling limit. The qubit is given by a Cooper-pair box, and population inversion is established by an additional third state, which can b…
Fragility of multi-junction flux qubits against quasiparticle tunneling
Juha Leppäkangas, Michael Marthaler
We study decoherence in superconducting qubits due to quasiparticle tunneling which is enhanced by two known deviations from the equilibrium BCS theory. The first process correspon…
Phase-dependent quasiparticle tunneling in Josephson junctions: Measuring the cos-phi term with a superconducting charge qubit
Juha Leppäkangas, Michael Marthaler, Gerd Schön
We investigate quasiparticle tunneling in a Cooper-pair box which is embedded in a superconducting ring to allow control of the total phase difference across the island. The phase…