Showing 2002 · quant-phShow all

10 papers · 2 filters

quant-ph2002★ 124 cited

Entanglement purification for Quantum Computation

W. Dür, H. -J. Briegel

We show that thresholds for fault-tolerant quantum computation are solely determined by the quality of single-system operations if one allows for d-dimensional systems with $8 \leq…

quant-ph2002★ 21 cited

Ascertaining the Values of , , and of a Polarization Qubit

Oliver Schulz, Ruprecht Steinhübl, Markus Weber +3

In the 1987 spin retrodiction puzzle of Vaidman, Aharonov, and Albert one is challenged to ascertain the values of , , and of a spin-1/2 particle by utilizing entan…

quant-ph2002★ 3 cited

Quantum Communication and Decoherence

Hans Aschauer, Hans J. Briegel

In this contribution we will give a brief overview on the methods used to overcome decoherence in quantum communication protocols. We give an introduction to quantum error correcti…

quant-ph2002★ 97 cited

Trajectories and Particle Creation and Annihilation in Quantum Field Theory

Detlef Duerr, Sheldon Goldstein, Roderich Tumulka +1

We develop a theory based on Bohmian mechanics in which particle world lines can begin and end. Such a theory provides a realist description of creation and annihilation events and…

quant-ph2002★ 265 cited

Quantum random walks in optical lattices

W. Dür, R. Raussendorf, V. M. Kendon +1

We propose an experimental realization of discrete quantum random walks using neutral atoms trapped in optical lattices. The random walk is taking place in position space and exper…

quant-ph2002★ 21 cited

Relating the Lorentzian and exponential: Fermi's approximation,the Fourier transform and causality

A. Bohm, N. L. Harshman, H. Walther

The Fourier transform is often used to connect the Lorentzian energy distribution for resonance scattering to the exponential time dependence for decaying states. However, to apply…

quant-ph2002★ 49 cited

Fresnel Representation of the Wigner Function: An Operational Approach

P. Lougovski, E. Solano, Z. M. Zhang +3

We present an operational definition of the Wigner function. Our method relies on the Fresnel transform of measured Rabi oscillations and applies to motional states of trapped atom…

quant-ph2002★ 103 cited

On the effective size of certain "Schrödinger cat'' like states

Wolfgang Dür, Christoph Simon, J. Ignacio Cirac

Several experiments and experimental proposals for the production of macroscopic superpositions naturally lead to states of the general form ,…

quant-ph2002★ 11 cited

Equivalence classes of non-local unitary operations

W. Dür, J. I. Cirac

We study when a multipartite non--local unitary operation can deterministically or probabilistically simulate another one when local operations of a certain kind -in some cases inc…

quant-ph2002★ 2 cited

Comment on ``Time-like flows of energy-momentum and particle trajectories for the Klein-Gordon equation''

Roderich Tumulka

Horton, Dewdney, and Nesteruk [quant-ph/0103114] have proposed Bohm-type particle trajectories accompanying a Klein-Gordon wave function psi on Minkowski space. From two vector fie…