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|Title:||Optimal quantum circuits for general phase estimation|
|Authors:||Van Dam, W.|
|Source:||Van Dam, W., D'Ariano, G.M., Ekert, A., MacChiavello, C., Mosca, M. (2007-03-01). Optimal quantum circuits for general phase estimation. Physical Review Letters 98 (9) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevLett.98.090501|
|Abstract:||We address the problem of estimating the phase given N copies of the phase-rotation gate u. We consider, for the first time, the optimization of the general case where the circuit consists of an arbitrary input state, followed by any arrangement of the N phase rotations interspersed with arbitrary quantum operations, and ending with a general measurement. Using the polynomial method, we show that, in all cases where the measure of quality of the estimate for depends only on the difference -, the optimal scheme has a very simple fixed form. This implies that an optimal general phase estimation procedure can be found by just optimizing the amplitudes of the initial state. © 2007 The American Physical Society.|
|Source Title:||Physical Review Letters|
|Appears in Collections:||Staff Publications|
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