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23 February 2005 Single-spin detection and read-out for the solid-state quantum computer via resonant techniques
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Direct single-spin detection for read-out in solid-state quantum computing architectures is a difficult problem due to the isolation of the spin qubit from its environment. Converting the problem to one of charge measurement is advantageous as we can measure the charge qubit using a single electron transistor (SET). The read-out state for the standard Si:P architecture -- a doubly occupied donor state D- -- results from spin-dependent electron tunneling between donors. Complications arise due to the low binding energy of this state, meaning existing adiabatic transfer schemes may cause ionisation of the D- state before measurement can be performed by the SET. We describe a new method for the read-out of spin qubits, using gated electric fields at resonance with the transition being measured, to resonantly transfer a single electron to the SET using small DC fields. In addition to this we propose an extension to this method where a far-infrared laser (FIR) induces the resonant transfer.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Matthew J. Testolin, Lloyd C. L. Hollenberg, Andrew D. Greentree, and Cameron J. Wellard "Single-spin detection and read-out for the solid-state quantum computer via resonant techniques", Proc. SPIE 5650, Micro- and Nanotechnology: Materials, Processes, Packaging, and Systems II, (23 February 2005);


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