Measuring the entanglement of coupled spins by multiphoton interference

Details Measuring the entanglement of coupled spins by multiphoton interference Measuring the entanglement of coupled spins by multiphoton interference

2003-07-26

arxiv.org/abs/cond-mat/0307657v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 EPS figures, REVTeX

Scientific paper

We propose an experimental method to measure the entanglement of coupled spins, each in a separate quantum dot, by means of multiphoton interference patterns generated through the scattering of two laser beams off the quantum dots. We calculate the N-photon quantum correlations measured by N detectors on an image plane. Using two perpendicular laser beams, either many correlation measurements on a time ensemble or a single correlation measurement on a spatial ensemble of the many-qubit state is sufficient to retrieve all the possible amplitudes of a many-qubit state.

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