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We investigate the conditions of an optimal measurement for estimating quantum states with minimal disturbance and maximal reversibility, and experimentally implement it in three-dimensional quantum states encoded by the single photon's polarization and path.
We report the generation of a photon-number entangled state in which detection of ancillary photons heralds the generation of the entangled state as well as its phase. Our scheme can operate with separable input states.
We report an experimental realization of an atomic vapor quantum memory for the photonic polarization qubit. The quantum memory is realized by means of electromagnetically-induced transparency in two spatially separated ensembles of warm Rubidium atoms in a single vapor cell. We have fully characterized the memory with quantum process tomography.
We experimentally demonstrated that the decoherence due to amplitude damping can be suppressed using quantum measurement reversal. By implementing two partial measurements, we succeeded in preferentially selecting the cases where states do not experience decoherence.
We report an entanglement concentration scheme in which a photon pair in the |Psi(-)> Bell-state is obtained from two pairs of partially (or non-maximally) . Our scheme is built upon linear optics only and does not require photon-number resolving detectors.
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