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|Title:||Optimal phase estimation in quantum networks|
|Authors:||Van Dam, W.|
|Source:||Van Dam, W., D'Ariano, G.M., Ekert, A., MacChiavello, C., Mosca, M. (2007-07-13). Optimal phase estimation in quantum networks. Journal of Physics A: Mathematical and Theoretical 40 (28) : 7971-7984. ScholarBank@NUS Repository. https://doi.org/10.1088/1751-8113/40/28/S07|
|Abstract:||We address the problem of estimating the phase given N copies of the phase rotation uφ within an array of quantum operations in finite dimensions. We first consider the special case where the array consists of an arbitrary input state followed by any arrangement of the N phase rotations, and ending with a POVM. We optimize the POVM for a given input state and fixed arrangement. Then we also optimize the input state for some specific cost functions. In all cases, the optimal POVM is equivalent to a quantum Fourier transform in an appropriate basis. Examples and applications are given. © 2007 IOP Publishing Ltd.|
|Source Title:||Journal of Physics A: Mathematical and Theoretical|
|Appears in Collections:||Staff Publications|
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