Single-Shot Readout of Electron Spin States in a Quantum Dot Using Spin-Dependent Tunnel Rates
Top Cited Papers
- 17 May 2005
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 94 (19) , 196802
- https://doi.org/10.1103/physrevlett.94.196802
Abstract
We present a method for reading out the spin state of electrons in a quantum dot that is robust against charge noise and can be used even when the electron temperature exceeds the energy splitting between the states. The spin states are first correlated to different charge states using a spin dependence of the tunnel rates. A subsequent fast measurement of the charge on the dot then reveals the original spin state. We experimentally demonstrate the method by performing readout of the two-electron spin states, achieving a single-shot visibility of more than 80%. We find very long triplet-to-singlet relaxation times (up to several milliseconds), with a strong dependence on the in-plane magnetic field.Keywords
All Related Versions
This publication has 17 references indexed in Scilit:
- Real-time detection of single-electron tunneling using a quantum point contactApplied Physics Letters, 2004
- Time-resolved detection of individual electrons in a quantum dotApplied Physics Letters, 2004
- Single-shot read-out of an individual electron spin in a quantum dotNature, 2004
- Single-shot measurement of the Josephson charge qubitPhysical Review B, 2004
- Electron counting of single-electron tunneling currentApplied Physics Letters, 2004
- Real-time detection of electron tunnelling in a quantum dotNature, 2003
- Few-electron quantum dot circuit with integrated charge read outPhysical Review B, 2003
- Spintronics: A Spin-Based Electronics Vision for the FutureScience, 2001
- Addition spectrum of a lateral dot from Coulomb and spin-blockade spectroscopyPhysical Review B, 2000
- Quantum computation with quantum dotsPhysical Review A, 1998