Measuring quantumness: from theory to observability in interferometric setups

Year: 2018

Authors: Ferro L.; Fazio R.; Illuminati F.; Marmo G.; Pascazio S.; Vedral V.

Autors Affiliation: INFN, Sez Napoli, I-80126 Naples, Italy; Morgan Stanley Analyt, H-1095 Budapest, Hungary; Abdus Salam Int Ctr Theoret Phys, Str Costiera 11, I-34151 Trieste, Italy; Scuola Normale Super Pisa, NEST, I-56126 Pisa, Italy; CNR, Ist Nanosci, I-56126 Pisa, Italy; Univ Salerno, Dipartimento Ingn Ind, I-84084 Fisciano, SA, Italy; Univ Napoli, Dipartimento Fis, I-80126 Naples, Italy; Univ Bari, Dipartimento Fis & MECENAS, I-70126 Bari, Italy; CNR, INO, I-50125 Florence, Italy; INFN, Sez Bari, I-70126 Bari, Italy; Univ Oxford, Dept Phys, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England; Natl Univ Singapore, Ctr Quantum Technol, 3 Sci Dr 2, Singapore 117543, Singapore; Natl Univ Singapore, Dept Phys, 2 Sci Dr 3, Singapore 117542, Singapore.

Abstract: We investigate the notion of quantumness based on the noncommutativity of the algebra of observables and introduce a measure of quantumness based on the mutual incompatibility of quantum states. We show that such a quantity can be experimentally measured with an interferometric setup and that, when an arbitrary bipartition of a given composite system is introduced, it detects the one-way quantum correlations restricted to one of the two subsystems. We finally show that, by combining only two projective measurements and carrying out the interference procedure, our measure becomes an efficient universal witness of quantum discord and nonclassical correlations.

Journal/Review: EUROPEAN PHYSICAL JOURNAL D

Volume: 72 (12)      Pages from: 219-1  to: 219-5

KeyWords: quantumness
DOI: 10.1140/epjd/e2018-90522-y

Citations: 7
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