Estimation of spin-spin interaction by weak measurement scheme
Department of Physics, Tokyo Institute of Technology - Meguro, Tokyo, 152-8551, Japan
2 Department of Mechanical Engineering, Massachusetts Institute of Technology - Cambridge, MA 02139, USA
3 Research Center for Quantum Computing, Interdisciplinary Graduate School of Science and Engineering, Kinki University - Higashi-Osaka, Osaka, 577-8502, Japan
Accepted: 23 September 2011
Precisely knowing an interaction Hamiltonian is crucial to realize quantum information tasks, especially to experimentally demonstrate a quantum computer and a quantum memory. We propose a scheme to experimentally evaluate the spin-spin interaction for a two-qubit system by the weak measurement technique initiated by Yakir Aharonov and his colleagues. Furthermore, we numerically confirm our proposed scheme in a specific system of a nitrogen vacancy center in diamond. This means that the weak measurement can also be taken as a concrete example of the quantum process tomography.
PACS: 03.65.Wj – State reconstruction, quantum tomography / 71.70.Jp – Nuclear states and interactions
© EPLA, 2011