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  • Title: Measurement efficiency and n-shot readout of spin qubits.
    Author: Engel HA, Golovach VN, Loss D, Vandersypen LM, Elzerman JM, Hanson R, Kouwenhoven LP.
    Journal: Phys Rev Lett; 2004 Sep 03; 93(10):106804. PubMed ID: 15447437.
    Abstract:
    We consider electron spin qubits in quantum dots and define a measurement efficiency e to characterize reliable measurements via n-shot readouts. We propose various implementations based on a double dot and a quantum point contact (QPC) and show that the associated efficiencies e vary between 50% and 100%, allowing single-shot readout in the latter case. We model the readout microscopically and derive its time dynamics in terms of a generalized master equation, calculate the QPC current, and show that it allows spin readout under realistic conditions.
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