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Direct and indirect strategies for phase measurement
Marcia T. Fontenelle, Samuel L. Braunstein, Wolfgang P. Schleich +1
Recently, Torgerson and Mandel [Phys. Rev. Lett. 76, 3939 (1996)] have reported a disagreement between two schemes for measuring the phase difference of a pair of optical fields. W…
Quantum copying: A network
V. Buzek, S. L. Braunstein, M. Hillery +1
We present a network consisting of quantum gates which produces two imperfect copies of an arbitrary qubit. The quality of the copies does not depend on the input qubit. We also sh…
Quantum copying: Fundamental inequalities
Mark Hillery, Vladimir Buzek
How well one can copy an arbitrary qubit? To answer this question we consider two arbitrary vectors in a two-dimensional state space and an abstract copying transformation which wi…
Broadcasting of entanglement via local copying
V. Buzek, V. Vedral, M. B. Plenio +2
We show that inseparability of quantum states can be partially broadcasted (copied, cloned) with the help of local operations, i.e. distant parties sharing an entangled pair of spi…