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9 papers · 2 filters
Long-range quantum discord in critical spin systems
J. Maziero, L. C. Céleri, R. M. Serra +1
We show that quantum correlations as quantified by quantum discord can characterize quantum phase transitions by exhibiting nontrivial long-range decay as a function of distance in…
Observer invariance of the collapse postulate of quantum mechanics
Milton A. da Silva, Roberto M. Serra, Lucas C. Celeri
We analyse the wave function collapse as seem by two distinct observers (with identical detectors) in relative motion. Imposing that the measurement process demands information tra…
Classicality witness for two-qubit states
J. Maziero, R. M. Serra
In the last few years one realized that if the state of a bipartite system can be written as , where and $\{…
Quantum circuits for spin and flavor degrees of freedom of quarks forming nucleons
F. L. Semiao, M. Paternostro
We discuss the quantum-circuit realization of the state of a nucleon in the scope of simple symmetry groups. Explicit algorithms are presented for the preparation of the state of a…
Bound on quantum computation time: Quantum error correction in a critical environment
E. Novais, Eduardo R. Mucciolo, Harold U. Baranger
We obtain an upper bound on the time available for quantum computation for a given quantum computer and decohering environment with quantum error correction implemented. First, we…
Symmetry aspects of quantum discord
J. Maziero, L. C. Celeri, R. M. Serra
Quantum discord (QD) reveals the nonclassical nature of correlations in bipartite quantum states, going beyond the entanglement-separability paradigm. In this article we discuss th…