http://www.cnr.it/ontology/cnr/individuo/prodotto/ID280159
Toward computability of trace distance discord (Articolo in rivista)
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- Label
- Toward computability of trace distance discord (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1088/1367-2630/16/1/013038 (literal)
- Alternative label
Ciccarello, F. [ 1,2 ] ; Tufarelli, T. [ 3 ] ; Giovannetti, V. [ 4,5 ] (2014)
Toward computability of trace distance discord
in New journal of physics; IOP PUBLISHING LTD, BRISTOL BS1 6BE (Regno Unito)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Ciccarello, F. [ 1,2 ] ; Tufarelli, T. [ 3 ] ; Giovannetti, V. [ 4,5 ] (literal)
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- http://www.scopus.com/inward/record.url?eid=2-s2.0-84894180012&partnerID=q2rCbXpz (literal)
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- [ 1 ] Univ Palermo, NEST, Ist Nanosci CNR, I-90123 Palermo, Italy
[ 2 ] Univ Palermo, Dipartimento Fis & Chim, I-90123 Palermo, Italy
[ 3 ] Univ London Imperial Coll Sci Technol & Med, QOLS, Blackett Lab, London SW7 2BW, England
[ 4 ] Scuola Normale Super Pisa, NEST, I-56126 Pisa, Italy
[ 5 ] Ist Nanosci CNR, I-56126 Pisa, Italy (literal)
- Titolo
- Toward computability of trace distance discord (literal)
- Abstract
- It is known that a reliable geometric quantifier of discord-like correlations can be built by employing the so-called trace distance, which is used to measure how far the state under investigation is from the closest 'classical-quantum' state. To date, the explicit calculation of this indicator for two qubits has only been accomplished for states where the reduced density matrix of the measured party is maximally mixed, a class that includes Bell-diagonal states. Here, we first reduce the required optimization for a general two-qubit state to the minimization of an explicit two-variable function. Using this framework, we show that the minimum can be analytically worked out in a number of relevant cases, including quantum-classical and X states. This provides an explicit and compact expression for the trace distance discord of an arbitrary state belonging to either of these important classes of density matrices. © 2014 IOP Publishing and Deutsche Physikalische Gesellschaft. (literal)
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