Frontiers of quantum physics

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Witnessing the quantumness of a single system: From anticommutators to interference and discord

Physical Review A - Atomic, Molecular, and Optical Physics 87:5 (2013)

Authors:

R Fazio, K Modi, S Pascazio, V Vedral, K Yuasa

Abstract:

We introduce a method to witness the quantumness of a system. The method relies on the fact that the anticommutator of two classical states is always positive. By contrast, we show that there is always a nonpositive anticommutator due to any two quantum states. We notice that interference depends on the trace of the anticommutator of two states, and it is therefore operationally more suitable to detect quantumness by looking at anticommutators of states rather than their commutators. © 2013 American Physical Society.
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Operational Significance of Discord Consumption

Institute of Electrical and Electronics Engineers (IEEE) (2013) 1-1

Authors:

T Symul, HM Chrzanowski, S Assad, PK Lam, TC Ralph, M Gu, K Modi, V Vedral
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A general framework for phase and interference

(2013)

Authors:

Andrew JP Garner, Oscar CO Dahlsten, Yoshifumi Nakata, Mio Murao, Vlatko Vedral
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Generation of quantum discord between ionic qubits via noisy processes

(2013)

Authors:

BP Lanyon, P Jurcevic, C Hempel, M Gessner, V Vedral, R Blatt, CF Roos
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Local characterization of 1d topologically ordered states

(2013)

Authors:

Jian Cui, Luigi Amico, Heng Fan, Mile Gu, Alioscia Hamma, Vlatko Vedral
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