Abstract
We present a very simple scheme for generating four-qubit cluster states with one step using parity measurement based on dipole-induced transparency in a cavity-waveguide system. The scheme only uses the photon detectors to check the parity of the spatially separated dipole, which are the same (even parity) or different (odd parity) through measuring the light fields in the waveguide. The initial entangled states remain after nondetective identification and they can be used for successive tasks.
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