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Physics  2004 

A Single Atom Transistor in a 1D Optical Lattice

DOI: 10.1103/PhysRevLett.93.140408

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We propose a scheme utilising a quantum interference phenomenon to switch the transport of atoms in a 1D optical lattice through a site containing an impurity atom. The impurity represents a qubit which in one spin state is transparent to the probe atoms, but in the other acts as a single atom mirror. This allows a single-shot quantum non-demolition measurement of the qubit spin.


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