Abstract
We analyze a conceptual approach to single-spin measurement. The method uses techniques from the theory of quantum cellular automata to correlate a large number of ancillary spins to the one to be measured. It has the distinct advantage of being efficient: under ideal conditions, it requires the application of only steps (each requiring a constant number of rf pulses) to create a system of correlated spins. Numerical simulations suggest that it is also, to a certain extent, robust against pulse errors, and imperfect initial polarization of the ancilla spin system.
- Received 3 January 2006
DOI:https://doi.org/10.1103/PhysRevLett.97.100501
©2006 American Physical Society