PMID: 22587235May 17, 2012Paper

Observable measure of bipartite quantum correlations

Physical Review Letters
Davide Girolami, Gerardo Adesso

Abstract

We introduce a measure Q of bipartite quantum correlations for arbitrary two-qubit states, expressed as a state-independent function of the density matrix elements. The amount of quantum correlations can be quantified experimentally by measuring the expectation value of a small set of observables on up to four copies of the state, without the need for a full tomography. We extend the measure to 2×d systems, providing its explicit form in terms of observables and applying it to the relevant class of multiqubit states employed in the deterministic quantum computation with one quantum bit model. The number of required measurements to determine Q in our scheme does not increase with d. Our results provide an experimentally friendly framework to estimate quantitatively the degree of general quantum correlations in composite systems.

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Citations

Sep 5, 2012·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·D O Soares-PintoL C Céleri
Mar 7, 2013·Scientific Reports·Carlo Di Franco, Mauro Paternostro
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