Hyperentanglement-Enabled Direct Characterization of Quantum Dynamics
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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. 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 over 98% but with one-third the number of experimental configurations required for standard quantum process tomography. Extensions of these techniques to multiqubit quantum processes are discussed.
Physical Review Letters
American Physical Society
Graham, T. M. et al. “Hyperentanglement-Enabled Direct Characterization of Quantum Dynamics.” Physical Review Letters 110.6 (2013). ©2013 American Physical Society
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