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11 papers
Transport signatures of quasiparticle poisoning in a Majorana island
S. M. Albrecht, E. B. Hansen, A. P. Higginbotham +7
We investigate effects of quasiparticle poisoning in a Majorana island with strong tunnel coupling to normal-metal leads. In addition to the main Coulomb blockade diamonds, "shadow…
Hybrid Double Quantum Dots: Normal, Superconducting, and Topological Regimes
D. Sherman, J. S. Yodh, S. M. Albrecht +3
Epitaxial semiconductor-superconductor hybrid materials are an excellent basis for studying mesoscopic and topological superconductivity, as the semiconductor inherits a hard super…
Exponential Protection of Zero Modes in Majorana Islands
S. M. Albrecht, A. P. Higginbotham, M. Madsen +5
Majorana zero modes are quasiparticle excitations in condensed matter systems that have been proposed as building blocks of fault-tolerant quantum computers [1]. They are expected…
InAs nanowire with epitaxial aluminium as a single-electron transistor with fixed tunnel barriers
M. Taupin, E. Mannila, P. Krogstrup +6
We report on fabrication of single-electron transistors using InAs nanowires with epitaxial aluminium with fixed tunnel barriers made of aluminium oxide. The devices exhibit a hard…
Towards realistic implementations of a Majorana surface code
L. A. Landau, S. Plugge, E. Sela +3
Surface codes have emerged as promising candidates for quantum information processing. Building on the previous idea to realize the physical qubits of such systems in terms of Majo…
Parity lifetime of bound states in a proximitized semiconductor nanowire
A. P. Higginbotham, S. M. Albrecht, G. Kirsanskas +7
Quasiparticle excitations can compromise the performance of superconducting devices, causing high frequency dissipation, decoherence in Josephson qubits, and braiding errors in pro…
Epitaxy of Semiconductor-Superconductor nanowires
P. Krogstrup, N. L. B. Ziino, W. Chang +6
Controlling the properties of semiconductor/metal interfaces is a powerful method for designing functionality and improving the performance of electrical devices. Recently semicond…
Hard gap in epitaxial semiconductor-superconductor nanowires
W. Chang, S. M. Albrecht, T. S. Jespersen +4
Many present and future applications of superconductivity would benefit from electrostatic control of carrier density and tunneling rates, the hallmark of semiconductor devices. On…
Efficient out-coupling of high-purity single photons from a coherent quantum dot in a photonic-crystal cavity
K. H. Madsen, S. Ates, J. Liu +5
We demonstrate a single-photon collection efficiency of from a quantum dot in a low-Q mode of a photonic-crystal cavity with a single-photon purity of $g^{(2)}(0)=…
Ab initio calculations of response properties including electron-hole interaction
Valerio Olevano, Stefan Albrecht, Lucia Reining
We discuss the current status of a computational approach which allows to evaluate the dielectric matrix, and hence electronic excitations like optical properties, including local…
Ab initio calculation of excitonic effects in the optical spectra of semiconductors
Stefan Albrecht, Lucia Reining, Rodolfo Del Sole +1
An ab initio approach to the calculation of excitonic effects in the optical absorption spectra of semiconductors and insulators is formulated. It starts from a quasiparticle bands…