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Recent Progress in Many-Body Theories

EFFECTS OF A SINGLE QUANTUM SPIN ON JOSEPHSON OSCILLATIONS

Marina Hruška, Lev N. Bulaevskii, Alexander Shnirman, DARRYL SMITH

Published Jul 1, 2006• 0 citations
Publisher
DOI
10.1142/9789812772893_0026

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We consider a single localized spin-1/2 placed between singlet superconducting leads of a Josephson junction inserted in a superconducting ring, subject to a dc magnetic field B || z. Turning on the tunneling or a time-dependent flux in a superconducting ring, induces oscillations of the Josephson current, with an amplitude sensitive to the initial value of the z-component of the spin, Sz = ±1/2, which allows for a measurement of the initial spin state. At low temperatures when effects of quasiparticles are negligible, this procedure realizes a quantum-non-demolition (QND) measurement of Sz.

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We consider a single localized spin-1/2 placed between singlet superconducting leads of a Josephson junction inserted in a superconducting ring, subject to a dc magnetic field B || z. Turning on the tunneling or a time-dependent flux in a superconducting ring, induces oscillations of the Josephson current, with an amplitude sensitive to the initial value of the z-component of the spin, Sz = ±1/2, which allows for a measurement of the initial spin state. At low temperatures when effects of quasiparticles are negligible, this procedure realizes a quantum-non-demolition (QND) measurement of Sz.