A qubit device based on manipulations of Andreev bound states in double-barrier Josephson junctions

Autor:	John B Ketterson, Ivan P. Nevirkovets, Serhii Shafranjuk
Rok vydání:	2002
Předmět:	Josephson effect Physics Flux qubit Charge qubit Spin states Condensed matter physics Biasing General Chemistry Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Phase qubit Quantum mechanics Qubit Bound state Materials Chemistry
Zdroj:	Solid State Communications. 121:457-460
ISSN:	0038-1098
DOI:	10.1016/s0038-1098(02)00040-6
Popis:	A qubit system exploiting manipulations of the Andreev bound state (ABS) levels in the SINIS junction by applying appropriate bias voltages and transport currents is suggested. The parameters of the SINIS setup may be chosen in such a way that only two ABS levels are present; this is in agreement with our experimental data obtained using Nb/Al double-barrier junctions. In the qubit Hamiltonian, H , the two ABS levels are presented as the ‘↑’ and ‘↓’ spin states, while the controlling physical parameters (voltage across one of the barriers and the transport current) are mapped to the ‘magnetic fields’ B x n and B z n . The phase decoherence time is estimated.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::94411e707d5609555e42c61bf435c63a https://doi.org/10.1016/s0038-1098(02)00040-6 Zobrazit plný text záznamu Full Text from ScienceDirect