| Issue |
EPL
Volume 109, Number 4, February 2015
|
|
|---|---|---|
| Article Number | 40001 | |
| Number of page(s) | 5 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/109/40001 | |
| Published online | 24 February 2015 | |
A measure for maximum similarity between outcome states
1 Departamento de Física, Universidad de Concepción - Casilla 160 - C, Concepción, Chile
2 Departamento de Física, Universidad de Guadalajara - Av. Revolución 1500, 44420 Guadalajara, Jalisco, Mexico
3 Department of Physics and NIST, University of Maryland - College Park, MD 20742, USA
Received: 3 November 2014
Accepted: 3 February 2015
We propose a measure to quantify correlations in a bipartite quantum system of two quibits by assessing the minimum difference between outcome states of a subsystem by performing a local measurement on the other subsystem. This maximum similarity measure is a monotone function of the concurrence for pure states of two qubits; for mixed states it accounts for entanglement, dissonance, and classical correlations. Besides, we found a closed formula for evaluating the similarity degree of an arbitrary mix state of two two-dimensional systems.
PACS: 03.65.-w – Quantum mechanics / 03.65.Aa – Quantum systems with finite Hilbert space / 03.67.-a – Quantum information
© EPLA, 2015
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