Please use this identifier to cite or link to this item:
http://hdl.handle.net/2289/3544
Title: | Characteristics and benchmarks of entanglement of mixed states: The two-qubit case |
Authors: | Bhardwaj, Shanthanu Ravishankar, V. |
Issue Date: | Feb-2008 |
Publisher: | American Physical Society |
Citation: | Physical Review A, 2008, Vol.77, 022322 |
Abstract: | We propose that the entanglement of mixed states is characterized properly in terms of a probability density function [script P]rho([script E]). There is a need for such a measure since the prevalent measures (such as concurrence and negativity) for two-qubit systems are rough benchmarks and not monotones of each other. Focusing on the two-qubit states, we provide an explicit construction of [script P]rho([script E]) and show that it is characterized by a set of parameters of which concurrence is but one particular combination. [script P]rho([script E]) is manifestly invariant under SU(2)×SU(2) transformations. It can, in fact, reconstruct the state up to local operations—with the specification of at most four additional parameters. Finally, the measure resolves the controversy regarding the role of entanglement in quantum computation in NMR systems. |
Description: | Open Access |
URI: | http://hdl.handle.net/2289/3544 |
ISSN: | 1094-1622 (online) 1050-2947 (print) |
Alternative Location: | http://dx.doi.org/10.1103/PhysRevA.77.022322 http://arxiv.org/abs/0801.1545 |
Copyright: | 2008 The American Physical Society |
Appears in Collections: | Research Papers (LAMP) |
Files in This Item:
File | Description | Size | Format | |
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2008 PRA V77 a022322.pdf | Open Access | 199.78 kB | Adobe PDF | View/Open |
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