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26 April 2024 |
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Measurement efficiency and n-shot read out of spin qubits | | Hans-Andreas Engel
; Vitaly Golovach
; Daniel Loss
; L.M.K. Vandersypen
; J.M. Elzerman
; R. Hanson
; L.P. Kouwenhoven
; | | Date: |
1 Sep 2003 | | Journal: | Phys. Rev. Lett. 93, 106804 (2004) DOI: 10.1103/PhysRevLett.93.106804 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall quant-ph | | Abstract: | We consider electron spin qubits in quantum dots and define a measurement efficiency e to characterize reliable measurements via n-shot read outs. We propose various implementations based on a double dot and quantum point contact (QPC) and show that the associated efficiencies e vary between 50% and 100%, allowing single-shot read out in the latter case. We model the read out microscopically and derive its time dynamics in terms of a generalized master equation, calculate the QPC current and show that it allows spin read out under realistic conditions. | | Source: | arXiv, cond-mat/0309023 | | Services: | Forum | Review | PDF | Favorites | |
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