A5100767374- Quantum and electron transport phenomena
- Topological Materials and Phenomena
- Mechanical and Optical Resonators
- Quantum Information and Cryptography
- Graphene research and applications
- Advanced Differential Geometry Research
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Quantum Mechanics and Non-Hermitian Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Physics of Superconductivity and Magnetism
- Quantum many-body systems
Consejo Superior de Investigaciones Científicas
2019-2022
Instituto de Ciencia de Materiales de Madrid
2018-2022
We realize a hybrid superconductor-semiconductor transmon device in which the Josephson effect is controlled by gate-defined quantum dot an InAs/Al nanowire. Microwave spectroscopy of transmon's transition spectrum allows us to probe ground state parity as function gate voltages, external magnetic flux, and field applied parallel The measured phase diagram agreement with that predicted single-impurity Anderson model superconducting leads. Through continuous time monitoring circuit we...
Andreev bound states (ABSs) in hybrid semiconductor-superconductor nanowires can have near-zero energy parameter regions where band topology predicts trivial phases. This surprising fact has been used to challenge the interpretation of a number transport experiments terms non-trivial with Majorana zero modes (MZMs). We show that this ongoing ABS versus MZM controversy is fully clarified when framed language non-Hermitian topology, natural description for open quantum systems. change paradigm...
We propose a novel strategy that permits the construction of completely general five-dimensional microstate geometries on Gibbons-Hawking space. Our scheme is based two steps. First, we rewrite bubble equations as system linear can be easily solved. Second, conjecture presence or absence closed timelike curves in solution detected through evaluation an algebraic relation. The systematic and covers whole space parameters, so it applied to find all BPS base. As first result this approach,...
We show that the microwave (MW) spectra in semiconductor-nanowire-based transmon qubits provide a strong signature of presence Majorana bound states junction. This occurs as an external magnetic field tunes wire into topological regime and energy splitting emergent modes oscillates around zero owing to their wave function spatial overlap finite-length wires. In particular, we discuss how these oscillations, concomitant fermion parity switches ground state junction, result distinct...
We theoretically study superconducting islands based on semiconductor-nanowire Josephson junctions and take into account the presence of subgap quasiparticle excitations in spectrum junction. Our method extends standard model Hamiltonian for a charge qubit replaces potential by Bogoliubov--de Gennes nanowire junction, projected onto relevant low-energy subspace. This allows us to fully incorporate coherent dynamics levels The combined effect spin-orbit coupling Zeeman energy nanowires...