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  • Title: Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates.
    Author: Hanson R, van Beveren LH, Vink IT, Elzerman JM, Naber WJ, Koppens FH, Kouwenhoven LP, Vandersypen LM.
    Journal: Phys Rev Lett; 2005 May 20; 94(19):196802. PubMed ID: 16090196.
    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.
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