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In recent years many designs have been demonstrated for quantum bits (qubits) based on the Josephson effect in low critical temperature superconductors. The use of such technology appears to be a natural choice since superconductors offer both the scalability, typical of solid state technology, and the properties of a macroscopic quantum system. The main issue when dealing with qubits is to reduce possible sources of decoherence that would be detrimental to its performances. One possible qubit implementation is offered by a rf Superconducting QUantum Interference Device (SQUID) which consists…mehr

Produktbeschreibung
In recent years many designs have been demonstrated for quantum bits (qubits) based on the Josephson effect in low critical temperature superconductors. The use of such technology appears to be a natural choice since superconductors offer both the scalability, typical of solid state technology, and the properties of a macroscopic quantum system. The main issue when dealing with qubits is to reduce possible sources of decoherence that would be detrimental to its performances. One possible qubit implementation is offered by a rf Superconducting QUantum Interference Device (SQUID) which consists of a superconducting loop interrupted by a thin insulating barrier, known as a Josephson junction. A variety of quantum of measurements of quantum effects on a rf SQUID are reported in this work along with a thorough data analysis that confirms that the main source of decoherence in this system can be linked to intrinsic low frequency flux noise.
Autorenporträt
Luigi Longobardi received a Ph.D. in Physics from Stony Brook University where he worked with Prof. J. Lukens on the study of decoherence in rf SQUID qubits. In 2009 he joined the quantum devices group at Seconda Universitá di Napoli, where he studies the quantum properties of nanodevices and works on the development of a YBCO based quantum bit.