Please use this identifier to cite or link to this item: http://hdl.handle.net/10497/15243
Title: 
Direct estimations of linear and nonlinear functionals of a quantum state
Authors: 
Issue Date: 
2002
Citation: 
Ekert, A. K., Alves, C. M., Oi, D. K. L., Horodecki, M., Horodecki, P., & Kwek, L. C. (2002). Direct estimations of linear and nonlinear functionals of a quantum state. Physical Review Letters, 88(21), 217901.
Abstract: 
We present a simple quantum network, based on the controlled-SWAP gate, that can extract
certain properties of quantum states without recourse to quantum tomography. It can be used used as a basic building block for direct quantum estimations of both linear and non-linear functionals of any density operator. The network has many potential applications ranging from purity tests
and eigenvalue estimations to direct characterization of some properties of quantum channels. Experimental realizations of the proposed network are within the reach of quantum technology that is currently being developed.
Description: 
This is an Author’s Pre-print of an Article published in Ekert, A. K., Alves, C. M., Oi, D. K. L., Horodecki, M., Horodecki, P. & Kwek, L. C. (2002). Direct estimations of linear and nonlinear functionals of a quantum state. Physical Review Letters, 88, 217901, as published in the Physical Review Letters, 2002, © American Physical Society, available online at: http://dx.doi.org/10.1103/PhysRevLett.88.217901
URI: 
ISSN: 
0031-9007
Other Identifiers: 
10.1103/PhysRevLett.88.217901
Website: 
Appears in Collections:Journal Articles

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