Monday, May 14, 2012

1205.2587 (Trent M. Graham et al.)

Hyperentanglement-enabled Direct Characterization of Quantum Dynamics    [PDF]

Trent M. Graham, Julio T. Barreiro, Masoud Mohseni, Paul G. Kwiat
We use hyperentangled photons to experimentally implement an entanglement-assisted quantum process tomography technique known as Direct Characterization of Quantum Dynamics. Specifically, hyperentanglement-assisted Bell-state analysis enabled us to characterize a variety of single-qubit quantum processes using far fewer experimental configurations than are required by Standard Quantum Process Tomography (SQPT). Furthermore, we demonstrate how known errors in Bell-state measurement may be compensated for in the data analysis. Using these techniques, we have obtained single-qubit process fidelities as high as 98.2% but with one-third the number experimental configurations required for SQPT. Extensions of these techniques to multi-qubit quantum processes are discussed.
View original: http://arxiv.org/abs/1205.2587

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