INVESTIGADORES
SCHMIEGELOW Christian Tomas
congresos y reuniones científicas
Título:
Selective and Efficient Quantum Process Tomography with Single Photons
Autor/es:
CHRISTIAN SCHMIEGELOW; ARIEL BENDERSKI; MIGUEL LAROTONDA; JUAN PABLO PAZ
Lugar:
Cancún
Reunión:
Conferencia; Quantum Optics V; 2010
Institución organizadora:
UNAM
Resumen:
We present experimental results demonstrating a photonic implementation
of an efficient quantum algorithm that estimates any parameter
characterizing an arbitrary quantum process. The algorithm, introduced
first in [PRL100,190403(2008)] not only enables estimation of
selected parameters using polynomial resources but also can be used to
efficiently determine all the elements of the $\chi$--matrix that are
larger than a fixed value. In our laboratory we performed full and partial
quantum process tomography on a channel affecting the qubit encoded
in the polarization of single photons[PRL104,123601(2010)]. Here, we report new
results for the quantum process tomography on a channel affecting
two qubits, encoded in the polarization and the path degrees of
freedom of single photons generated by parametric down conversion.
We compare our results with the ones obtained using standard quantum
process tomography showing that for the two--qubit channel the new
selective method is already more efficient than the standard one.