Exciting Andreev pairs in a superconducting atomic contact
| Autor: | Daniel Esteve, Cristian Urbina, Landry Bretheau, Caglar Girit, Hugues Pothier |
|---|---|
| Přispěvatelé: | Quantronics Group (QUANTRONICS), Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2013 |
| Předmět: |
Josephson effect
FOS: Physical sciences 02 engineering and technology 01 natural sciences Andreev reflection Superconductivity (cond-mat.supr-con) Pi Josephson junction Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] 010306 general physics [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall] ComputingMilieux_MISCELLANEOUS supercurrent [PHYS]Physics [physics] Condensed Matter::Quantum Gases Physics Superconductivity Multidisciplinary Andreev bound states Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Condensed Matter - Superconductivity Supercurrent 021001 nanoscience & nanotechnology 3. Good health weak links [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con] Excited state Superconducting tunnel junction qubits 0210 nano-technology Superconducting quantum computing |
| Zdroj: | Nature Nature, Nature Publishing Group, 2013, 499 (7458), pp.312-315. ⟨10.1038/nature12315⟩ Nature, 2013, 499 (7458), pp.312-315. ⟨10.1038/nature12315⟩ |
| ISSN: | 1476-4687 0028-0836 1476-4679 |
| DOI: | 10.1038/nature12315 |
| Popis: | The Josephson effect describes the flow of supercurrent in a weak link, such as a tunnel junction, nanowire, or molecule, between two superconductors. It is the basis for a variety of circuits and devices, with applications ranging from medicine to quantum information. Currently, experiments using Josephson circuits that behave like artificial atoms are revolutionizing the way we probe and exploit the laws of quantum physics. Microscopically, the supercurrent is carried by Andreev pair states, which are localized at the weak link. These states come in doublets and have energies inside the superconducting gap. Existing Josephson circuits are based on properties of just the ground state of each doublet and so far the excited states have not been directly detected. Here we establish their existence through spectroscopic measurements of superconducting atomic contacts. The spectra, which depend on the atomic configuration and on the phase difference between the superconductors, are in complete agreement with theory. Andreev doublets could be exploited to encode information in novel types of superconducting qubits. Submitted to Nature |
| Databáze: | OpenAIRE |
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