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9 papers · 2 filters
Entanglement purification of unknown quantum states
Todd A. Brun, Carlton M. Caves, Ruediger Schack
A concern has been expressed that ``the Jaynes principle can produce fake entanglement'' [R. Horodecki et al., Phys. Rev. A {\bf 59}, 1799 (1999)]. In this paper we discuss the gen…
Entanglement of Formation of an Arbitrary State of Two Rebits
Carlton M. Caves, Christopher A. Fuchs, Pranaw Rungta
We consider entanglement for quantum states defined in vector spaces over the real numbers. Such real entanglement is different from entanglement in standard quantum mechanics over…
Quantum Bayes rule
Ruediger Schack, Todd A. Brun, Carlton M. Caves
We state a quantum version of Bayes's rule for statistical inference and give a simple general derivation within the framework of generalized measurements. The rule can be applied…
Phase diffusion as a model for coherent suppression of tunneling in the presence of noise
J. Grondalski, P. M. Alsing, I. H. Deutsch
We study the stabilization of coherent suppression of tunneling in a driven double-well system subject to random periodic function ``kicks''. We model dissipation due to this s…
On quantum coding for ensembles of mixed states
Howard Barnum, Carlton M. Caves, Christopher A. Fuchs +2
We consider the problem of optimal asymptotically faithful compression for ensembles of mixed quantum states. Although the optimal rate is unknown, we prove upper and lower bounds…
Mesoscopic quantum coherence in an optical lattice
D. L. Haycock, P. M. Alsing, I. H. Deutsch +2
We observe the quantum coherent dynamics of atomic spinor wavepackets in the double well potentials of a far-off-resonance optical lattice. With appropriate initial conditions the…