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20012008
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8 papers · 2 filters

quant-ph2004

Improving teleportation of continuous variables by local operations

Ladislav Mišta, Radim Filip

We study a continuous-variable (CV) teleportation protocol based on a shared entangled state produced by the quantum-nondemolition (QND) interaction of two vacuum states. The schem…

quant-ph2004

Experimental demonstration of continuous variable quantum erasing

Ulrik L. Andersen, Oliver Glöckl, Stefan Lorenz +2

We experimentally demonstrate the concept of continuous variable quantum erasing. The amplitude quadrature of the signal state is labelled to another state via a quantum nondemolit…

quant-ph2004

Partial deterministic non-demolition Bell measurement

Ladislav Mišta, Radim Filip

We propose the scheme implementing partial deterministic non-demolition Bell measurement. When it is used in quantum teleportation the information about an unknown input state is o…

quant-ph2004

Knowledge excess duality and violation of Bell inequalities

R. Filip, M. Gavenda

A constraint on two complementary knowledge excesses by maximal violation of Bell inequalities for a single copy of any mixed state of two qubits is analyzed. The complementa…

quant-ph2004

Continuous-variable quantum non-demolishing interaction at a distance

Radim Filip

A feasible setup of continuous-variable (CV) quantum non-demolishing (QND) interaction at a distance is proposed. If two distant experimentalists are able to locally perform identi…

quant-ph2004

Experimental Purification of Single Qubits

M. Ricci, F. De Martini, N. J. Cerf +3

We report the experimental realization of the purification protocol for single qubits sent through a depolarization channel. The qubits are associated with polarization encoded pho…