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We demonstrate that local transformations on a composite quantum system can be enhanced in the presence of certain entangled states. These extra states act much like catalysts in a chemical reaction: they allow otherwise impossible local transformations to be realised, without being consumed in any way. In particular, we show that this effect can… (More)

We find a minimal set of necessary and sufficient conditions for the existence of a local procedure that converts a finite pure state into one of a set of possible final states. This result provides a powerful method for obtaining optimal local entanglement manipulation protocols for pure initial states. As an example, we determine analytically the optimal… (More)

The last few years have seen impressive progress in the experimental demonstration of quantum information processing [1]. Among the growing number of possible physical scenarios for these demonstrations, the system of laser-cooled trapped ions still remains one of the most experimentally attractive [2–5] (for reviews of iontrap quantum computing, see e.g.… (More)

- D McKiernan, D Jonathan
- Clinical otolaryngology and allied sciences
- 2001

We analyze approximate transformations of pure entangled quantum states by local operations and classical communication, finding explicit conversion strategies which optimize the fidelity of transformation. These results allow us to determine the most faithful teleportation strategy via an initially shared partially entangled pure state. They also show that… (More)

- D Jonathan, M B Plenio
- Physical review letters
- 2001

An effective interaction between trapped ions in thermal motion can be generated by illuminating them simultaneously with a single laser resonant with the ionic carrier frequency. The ac Stark shift induces simultaneous "virtual" two-phonon transitions via several motional modes. Within a certain laser intensity range these transitions can interfere… (More)

- Clayton D. Knox, Pieter‐Jan de Kam, +16 authors Amjad Ali
- Journal of the American Heart Association
- 2016

BACKGROUND
Nitric oxide donors are widely used to treat cardiovascular disease, but their major limitation is the development of tolerance, a multifactorial process to which the in vivo release of nitric oxide is thought to contribute. Here we describe the preclinical and clinical results of a translational drug development effort to create a… (More)

The phenomenon of atomic population trapping in the Jaynes-Cummings Model is analysed from a dressed-state point of view. A general condition for the occurrence of partial or total trapping from an arbitrary, pure initial atom-field state is obtained in the form of a bound to the variation of the atomic inversion. More generally, it is found that in the… (More)

- M G A Paris, M B Plenio, S Bose, D Jonathan, G M D 'ariano
- 1999

We describe a nonlinear interferometric setup to perform a complete optical Bell measurement, i.e. to unambiguously discriminate the four polarization-entangled EPR-Bell photon pairs. The scheme is robust against detector inefficiency.

The phenomenon of atomic population trapping in the Jaynes-Cummings Model is analysed from a dressed-state point of view. A general condition for the occurrence of partial or total trapping from an arbitrary, pure initial atom-field state is obtained in the form of a bound to the variation of the atomic inversion. More generally, it is found that in the… (More)

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