Send to

Choose Destination
Phys Rev Lett. 2004 Sep 3;93(10):106804. Epub 2004 Sep 3.

Measurement efficiency and n-shot readout of spin qubits.

Author information

Department of Physics and Astronomy, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.


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.

Supplemental Content

Full text links

Icon for American Physical Society
Loading ...
Support Center