INVESTIGADORES
SCHMIEGELOW Christian Tomas
artículos
Título:
Selective and Efficient Quantum Process Tomography with Single Photons
Autor/es:
CHRISTIAN TOMÁS SCHMIEGELOW; MIGUEL ANTONIO LAROTONDA; JUAN PABLO PAZ
Revista:
PHYSICAL REVIEW LETTERS
Editorial:
AMER PHYSICAL SOC
Referencias:
Año: 2010 vol. 104 p. 123601 - 132601
ISSN:
0031-9007
Resumen:
We present the results of the first photonic implementation of a new
method for quantum process tomography. The method {originally presented
by A. Bendersky et al. [Phys. Rev. Lett. 100, 190403 (2008)]} enables the estimation of any element of the chi-matrix
that characterizes a quantum process using resources that scale
polynomially with the number of qubits. It is based on the idea of
mapping the estimation of any chi-matrix
element onto the average fidelity of a quantum channel and estimating
the latter by sampling randomly over a special set of states called a
2-design. With a heralded single photon source we fully implement such
algorithm and perform process tomography on a number of channels
affecting the polarization qubit. The method is compared with other
existing ones, and its advantages are discussed.