Nondemolition measurements of a single quantum spin using Josephson oscillations
| dc.creator | Bulaevskii, L. | |
| dc.creator | Hruška, M. | |
| dc.creator | Shnirman, A. | |
| dc.creator | Smith, D. | |
| dc.creator | Makhlin, Yu. | |
| dc.date | 2003-12-11 | |
| dc.date | 2003-12-12 | |
| dc.date.accessioned | 2026-07-25T15:28:02Z | |
| dc.description | We consider a Josephson junction containing a single localized spin 1/2 between conventional singlet superconducting electrodes. We study the spin dynamics and measurements when a dc-magnetic field ${\bf B}\parallel z$ acts on the spin and the junction is embedded into a dissipative circuit. We show that when tunneling or a voltage are turned on at time $t=0$ the Josephson current starts to oscillate with an amplitude depending on the initial ($t=0$) value of the spin $z$-component, $S_z= \pm 1/2$. At low temperatures, when effects of quasiparticles may be neglected, this procedure realizes a quantum-non-demolition (QND) measurement of $S_z$. | |
| dc.description | 4 pages, 1 figure; average value of spin z operator changed to eigenvalue S_z | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0312274 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0312274 | |
| dc.identifier | Phys. Rev. Lett. 92, 177001 (2004) | |
| dc.identifier | doi:10.1103/PhysRevLett.92.177001 | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/34108 | |
| dc.subject | Superconductivity | |
| dc.title | Nondemolition measurements of a single quantum spin using Josephson oscillations | |
| dc.type | text |