10.9k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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10 papers · 2 filters
Estimation of pure qubit states with collective and individual measurements
E. Bagan, A. Monras, R. Munoz-Tapia
We analyze the estimation of a qubit pure state by means of local measurements on identical copies and compare its averaged fidelity for an isotropic prior probability distribu…
Secrecy content of two-qubit states
A. Acín, J. Bae, E. Bagan +3
We analyze the set of two-qubit states from which a secret key can be extracted by single-copy measurements plus classical processing of the outcomes. We introduce a key distillati…
Multiple copy 2-state discrimination with individual measurements
A Acin, E. Bagan, M. Baig +2
We address the problem of non-orthogonal two-state discrimination when multiple copies of the unknown state are available. We give the optimal strategy when only fixed individual m…
Bell's inequality tests: from photons to B-mesons
A. Bramon, R. Escribano, G. Garbarino
We analyse the recent claim that a violation of a Bell's inequality has been observed in the --meson system [A. Go, {\em Journal of Modern Optics} {\bf 51} (2004) 991]. The resu…
Violation of a Bell inequality in particle physics experimentally verified?
R. A. Bertlmann, A. Bramon, G. Garbarino +1
Relevant aspects for testing Bell inequalities with entangled meson-antimeson systems are analyzed. In particular, we argue that the result of A. Go, J. Mod. Optics 51, 991 (2004),…
Cavity QED quantum phase gates for a single longitudinal mode of the intracavity field
R. García--Maraver, R. Corbalán, K. Eckert +3
A single three-level atom driven by a longitudinal mode of a high-Q cavity is used to implement two-qubit quantum phase gates for the intracavity field. The two qubits are associat…
Quantum theory of a polarization phase-gate in an atomic tripod configuration
S. Rebic, D. Vitali, C. Ottaviani +4
We present the quantum theory of a polarization phase-gate that can be realized in a sample of ultracold rubidium atoms driven into a tripod configuration. The main advantages of t…
Unitarity as preservation of entropy and entanglement in quantum systems
Florian Hulpke, Uffe V. Poulsen, Anna Sanpera +3
The logical structure of Quantum Mechanics (QM) and its relation to other fundamental principles of Nature has been for decades a subject of intensive research. In particular, the…
Quantum reverse-engineering and reference frame alignment without non-local correlations
E. Bagan, M. Baig, R. Munoz-Tapia
Estimation of unknown qubit elementary gates and alignment of reference frames are formally the same problem. Using quantum states made out of qubits, we show that the theoreti…
Active and Passive Quantum Erasers for Neutral Kaons
A. Bramon, G. Garbarino, B. C. Hiesmayr
Quantum marking and quantum erasure are discussed for the neutral kaon system. Contrary to other two-level systems, strangeness and lifetime of a neutral kaon state can be alternat…