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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 as a basic building block for direct quantum estimations of both linear and nonlinear 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.
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie z listy filadelfijskiej
- Published in:
-
PHYSICAL REVIEW LETTERS
no. 88,
edition 21,
pages 1 - 4,
ISSN: 0031-9007 - Language:
- English
- Publication year:
- 2002
- Bibliographic description:
- Ekert A., Alves C., Oi D., Horodecki M., Horodecki P., Kwek L.: Direct estimation of linear and nonlinear functionals of quantum state// PHYSICAL REVIEW LETTERS. -Vol. 88., iss. 21 (2002), s.1-4
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/physrevlett.88.217901
- Verified by:
- Gdańsk University of Technology
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