Nondemolition Measurements of a Single Quantum Spin using Josephson Oscillations
L. Bulaevskii, M. Hruška, A. Shnirman, D. Smith, Yu. Makhlin
DOI 10.1103/PhysRevLett.92.177001 · Physical Review Letters
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Abstract
We consider a single localized spin-1/2 between the singlet superconducting leads of a Josephson junction (e.g., a superconducting STM). For the spin subject to a dc magnetic field B∥z, we study the spin dynamics and the possibility to measure the spin state via transport through the junction embedded in a dissipative circuit. Turning on the tunneling or a voltage bias induces oscillations of the Josephson current, with an amplitude sensitive to the initial value of the z component of the spin, Sz=±1/2. At low temperatures, when effects of quasiparticles are negligible, this procedure realizes a quantum nondemolition measurement of Sz.
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